liboffloadmic/

	* plugin/libgomp-plugin-intelmic.cpp (OFFLOAD_ACTIVE_WAIT_ENV): New
	define.
	(init): Set OFFLOAD_ACTIVE_WAIT env var to 0, if it is not set.
	* runtime/emulator/coi_common.h (PIPE_HOST_PATH): Replace with ...
	(PIPE_HOST2TGT_NAME): ... this.
	(PIPE_TARGET_PATH): Replace with ...
	(PIPE_TGT2HOST_NAME): ... this.
	(MALLOCN): New define.
	(READN): Likewise.
	(WRITEN): Likewise.
	(enum cmd_t): Replace CMD_RUN_FUNCTION with CMD_PIPELINE_RUN_FUNCTION.
	Add CMD_PIPELINE_CREATE, CMD_PIPELINE_DESTROY.
	* runtime/emulator/coi_device.cpp (engine_dir): New static variable.
	(pipeline_thread_routine): New static function.
	(COIProcessWaitForShutdown): Use global engine_dir instead of mic_dir.
	Rename pipe_host and pipe_target to pipe_host2tgt and pipe_tgt2host.
	If cmd is CMD_PIPELINE_CREATE, create a new thread for the pipeline.
	Remove cmd == CMD_RUN_FUNCTION case.
	* runtime/emulator/coi_device.h (COIERRORN): New define.
	* runtime/emulator/coi_host.cpp: Include set, map, queue.
	Replace typedefs with enums and structs.
	(struct Function): Remove name, add num_buffers, bufs_size,
	bufs_data_target, misc_data_len, misc_data, return_value_len,
	return_value, completion_event.
	(struct Callback): New.
	(struct Process): Remove pipeline.  Add pipe_host2tgt and pipe_tgt2host.
	(struct Pipeline): Remove pipe_host and pipe_target.  Add thread,
	destroy, is_destroyed, pipe_host2tgt_path, pipe_tgt2host_path,
	pipe_host2tgt, pipe_tgt2host, queue, process.
	(max_pipeline_num): New static variable.
	(pipelines): Likewise.
	(max_event_num): Likewise.
	(non_signalled_events): Likewise.
	(errored_events): Likewise.
	(callbacks): Likewise.
	(cleanup): Do not check tmp_dirs before free.
	(start_critical_section): New static function.
	(finish_critical_section): Likewise.
	(pipeline_is_destroyed): Likewise.
	(maybe_invoke_callback): Likewise.
	(signal_event): Likewise.
	(get_event_result): Likewise.
	(COIBufferCopy): Rename arguments according to headers.  Add asserts.
	Use process' main pipes, instead of pipeline's pipes.  Signal completion
	event.
	(COIBufferCreate): Rename arguments according to headers.  Add asserts.
	Use process' main pipes, instead of pipeline's pipes.
	(COIBufferCreateFromMemory): Rename arguments according to headers.
	Add asserts.
	(COIBufferDestroy): Rename arguments according to headers.  Add asserts.
	Use process' main pipes, instead of pipeline's pipes.
	(COIBufferGetSinkAddress): Rename arguments according to headers.
	Add asserts.
	(COIBufferMap): Rename arguments according to headers.  Add asserts.
	Signal completion event.
	(COIBufferRead): Likewise.
	(COIBufferSetState): Likewise.
	(COIBufferUnmap): Likewise.
	(COIBufferWrite): Likewise.
	(COIEngineGetCount): Add assert.
	(COIEngineGetHandle): Rename arguments according to headers.
	Add assert.
	(COIEventWait): Rename arguments according to headers.  Add asserts.
	Implement waiting for events with zero or infinite timeout.
	(COIEventRegisterCallback): New function.
	(pipeline_thread_routine): New static function.
	(COIPipelineCreate): Create a new thread for the pipeline.
	(COIPipelineDestroy): Exit pipeline thread.
	(COIPipelineRunFunction): Add the function into pipeline's queue,
	instead running it here.  Wait for it's completion in case of
	synchronous execution.
	(COIProcessCreateFromMemory): Rename arguments according to headers.
	Add asserts.  Create process' main pipes, instead of pipeline's pipes.
	(COIProcessDestroy): Rename arguments according to headers.
	Add asserts.  Destroy all undestroyed pipelines.
	(COIProcessGetFunctionHandles): Rename arguments according to headers.
	Add asserts.  Use process' main pipes, instead of pipeline's pipes.
	Remove useless function names.
	(COIProcessLoadLibraryFromMemory): Add asserts.  Use process' main
	pipes, instead of pipeline's pipes.
	(COIProcessUnloadLibrary): Likewise.
	(COIEngineGetInfo): Add assert.
	* runtime/emulator/coi_host.h (COIERRORN): New define.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@228248 138bc75d-0d04-0410-961f-82ee72b054a4

7 files changed, 1126 insertions, 611 deletions

diff --git a/liboffloadmic/ChangeLog b/liboffloadmic/ChangeLog
index 130026dd0410..d974aa309847 100644
--- a/liboffloadmic/ChangeLog
+++ b/liboffloadmic/ChangeLog
@@ -1,3 +1,89 @@
+2015-09-29  Ilya Verbin  <ilya.verbin@intel.com>
+
+	* plugin/libgomp-plugin-intelmic.cpp (OFFLOAD_ACTIVE_WAIT_ENV): New
+	define.
+	(init): Set OFFLOAD_ACTIVE_WAIT env var to 0, if it is not set.
+	* runtime/emulator/coi_common.h (PIPE_HOST_PATH): Replace with ...
+	(PIPE_HOST2TGT_NAME): ... this.
+	(PIPE_TARGET_PATH): Replace with ...
+	(PIPE_TGT2HOST_NAME): ... this.
+	(MALLOCN): New define.
+	(READN): Likewise.
+	(WRITEN): Likewise.
+	(enum cmd_t): Replace CMD_RUN_FUNCTION with CMD_PIPELINE_RUN_FUNCTION.
+	Add CMD_PIPELINE_CREATE, CMD_PIPELINE_DESTROY.
+	* runtime/emulator/coi_device.cpp (engine_dir): New static variable.
+	(pipeline_thread_routine): New static function.
+	(COIProcessWaitForShutdown): Use global engine_dir instead of mic_dir.
+	Rename pipe_host and pipe_target to pipe_host2tgt and pipe_tgt2host.
+	If cmd is CMD_PIPELINE_CREATE, create a new thread for the pipeline.
+	Remove cmd == CMD_RUN_FUNCTION case.
+	* runtime/emulator/coi_device.h (COIERRORN): New define.
+	* runtime/emulator/coi_host.cpp: Include set, map, queue.
+	Replace typedefs with enums and structs.
+	(struct Function): Remove name, add num_buffers, bufs_size,
+	bufs_data_target, misc_data_len, misc_data, return_value_len,
+	return_value, completion_event.
+	(struct Callback): New.
+	(struct Process): Remove pipeline.  Add pipe_host2tgt and pipe_tgt2host.
+	(struct Pipeline): Remove pipe_host and pipe_target.  Add thread,
+	destroy, is_destroyed, pipe_host2tgt_path, pipe_tgt2host_path,
+	pipe_host2tgt, pipe_tgt2host, queue, process.
+	(max_pipeline_num): New static variable.
+	(pipelines): Likewise.
+	(max_event_num): Likewise.
+	(non_signalled_events): Likewise.
+	(errored_events): Likewise.
+	(callbacks): Likewise.
+	(cleanup): Do not check tmp_dirs before free.
+	(start_critical_section): New static function.
+	(finish_critical_section): Likewise.
+	(pipeline_is_destroyed): Likewise.
+	(maybe_invoke_callback): Likewise.
+	(signal_event): Likewise.
+	(get_event_result): Likewise.
+	(COIBufferCopy): Rename arguments according to headers.  Add asserts.
+	Use process' main pipes, instead of pipeline's pipes.  Signal completion
+	event.
+	(COIBufferCreate): Rename arguments according to headers.  Add asserts.
+	Use process' main pipes, instead of pipeline's pipes.
+	(COIBufferCreateFromMemory): Rename arguments according to headers.
+	Add asserts.
+	(COIBufferDestroy): Rename arguments according to headers.  Add asserts.
+	Use process' main pipes, instead of pipeline's pipes.
+	(COIBufferGetSinkAddress): Rename arguments according to headers.
+	Add asserts.
+	(COIBufferMap): Rename arguments according to headers.  Add asserts.
+	Signal completion event.
+	(COIBufferRead): Likewise.
+	(COIBufferSetState): Likewise.
+	(COIBufferUnmap): Likewise.
+	(COIBufferWrite): Likewise.
+	(COIEngineGetCount): Add assert.
+	(COIEngineGetHandle): Rename arguments according to headers.
+	Add assert.
+	(COIEventWait): Rename arguments according to headers.  Add asserts.
+	Implement waiting for events with zero or infinite timeout.
+	(COIEventRegisterCallback): New function.
+	(pipeline_thread_routine): New static function.
+	(COIPipelineCreate): Create a new thread for the pipeline.
+	(COIPipelineDestroy): Exit pipeline thread.
+	(COIPipelineRunFunction): Add the function into pipeline's queue,
+	instead running it here.  Wait for it's completion in case of
+	synchronous execution.
+	(COIProcessCreateFromMemory): Rename arguments according to headers.
+	Add asserts.  Create process' main pipes, instead of pipeline's pipes.
+	(COIProcessDestroy): Rename arguments according to headers.
+	Add asserts.  Destroy all undestroyed pipelines.
+	(COIProcessGetFunctionHandles): Rename arguments according to headers.
+	Add asserts.  Use process' main pipes, instead of pipeline's pipes.
+	Remove useless function names.
+	(COIProcessLoadLibraryFromMemory): Add asserts.  Use process' main
+	pipes, instead of pipeline's pipes.
+	(COIProcessUnloadLibrary): Likewise.
+	(COIEngineGetInfo): Add assert.
+	* runtime/emulator/coi_host.h (COIERRORN): New define.
+
 2015-09-28  Ilya Verbin  <ilya.verbin@intel.com>
 
 	PR other/67652
diff --git a/liboffloadmic/plugin/libgomp-plugin-intelmic.cpp b/liboffloadmic/plugin/libgomp-plugin-intelmic.cpp
index fde7d9e38206..9ebd070e0f5e 100644
--- a/liboffloadmic/plugin/libgomp-plugin-intelmic.cpp
+++ b/liboffloadmic/plugin/libgomp-plugin-intelmic.cpp
@@ -42,6 +42,7 @@
 
 #define LD_LIBRARY_PATH_ENV	"LD_LIBRARY_PATH"
 #define MIC_LD_LIBRARY_PATH_ENV	"MIC_LD_LIBRARY_PATH"
+#define OFFLOAD_ACTIVE_WAIT_ENV	"OFFLOAD_ACTIVE_WAIT"
 
 #ifdef DEBUG
 #define TRACE(...)					    \
@@ -115,18 +116,23 @@ static VarDesc vd_tgt2host = {
 };
 
 
-/* Add path specified in LD_LIBRARY_PATH to MIC_LD_LIBRARY_PATH, which is
-   required by liboffloadmic.  */
 __attribute__((constructor))
 static void
 init (void)
 {
   const char *ld_lib_path = getenv (LD_LIBRARY_PATH_ENV);
   const char *mic_lib_path = getenv (MIC_LD_LIBRARY_PATH_ENV);
+  const char *active_wait = getenv (OFFLOAD_ACTIVE_WAIT_ENV);
+
+  /* Disable active wait by default to avoid useless CPU usage.  */
+  if (!active_wait)
+    setenv (OFFLOAD_ACTIVE_WAIT_ENV, "0", 0);
 
   if (!ld_lib_path)
     goto out;
 
+  /* Add path specified in LD_LIBRARY_PATH to MIC_LD_LIBRARY_PATH, which is
+     required by liboffloadmic.  */
   if (!mic_lib_path)
     setenv (MIC_LD_LIBRARY_PATH_ENV, ld_lib_path, 1);
   else
diff --git a/liboffloadmic/runtime/emulator/coi_common.h b/liboffloadmic/runtime/emulator/coi_common.h
index 7eae324ee740..63af984ca849 100644
--- a/liboffloadmic/runtime/emulator/coi_common.h
+++ b/liboffloadmic/runtime/emulator/coi_common.h
@@ -72,11 +72,11 @@
 /* Relative path to directory with pipes.  */
 #define PIPES_PATH		  "/pipes"
 
-/* Relative path to target-to-host pipe.  */
-#define PIPE_HOST_PATH		  PIPES_PATH"/host"
+/* Non-numerical part of host-to-target pipe file name.  */
+#define PIPE_HOST2TGT_NAME	  PIPES_PATH "/host2tgt_"
 
-/* Relative path to host-to-target pipe.  */
-#define PIPE_TARGET_PATH	  PIPES_PATH"/target"
+/* Non-numerical part of target-to-host pipe file name.  */
+#define PIPE_TGT2HOST_NAME	  PIPES_PATH "/tgt2host_"
 
 /* Non-numerical part of shared memory file name.  */
 #define SHM_NAME		  "/offload_shm_"
@@ -99,6 +99,15 @@
   ptr = p;					\
 }
 
+/* Like MALLOC, but return NULL instead of COIRESULT.  */
+#define MALLOCN(type, ptr, size)		\
+{						\
+  type p = (type) malloc (size);		\
+  if (p == NULL)				\
+    COIERRORN ("Cannot allocate memory.");	\
+  ptr = p;					\
+}
+
 /* Wrapper for strdup.  */
 #define STRDUP(ptr, str)			\
 {						\
@@ -116,6 +125,14 @@
     COIERROR ("Cannot read from pipe.");	\
 }
 
+/* Like READ, but return NULL instead of COIRESULT.  */
+#define READN(pipe, ptr, size)			\
+{						\
+  int s = (int) size;				\
+  if (read (pipe, ptr, s) != s)			\
+    COIERRORN ("Cannot read from pipe.");	\
+}
+
 /* Wrapper for pipe writing.  */
 #define WRITE(pipe, ptr, size)			\
 {						\
@@ -124,6 +141,14 @@
     COIERROR ("Cannot write in pipe.");		\
 }
 
+/* Like WRITE, but return NULL instead of COIRESULT.  */
+#define WRITEN(pipe, ptr, size)			\
+{						\
+  int s = (int) size;				\
+  if (write (pipe, ptr, s) != s)		\
+    COIERRORN ("Cannot write in pipe.");	\
+}
+
 
 /* Command codes enum.  */
 typedef enum
@@ -134,7 +159,9 @@ typedef enum
   CMD_GET_FUNCTION_HANDLE,
   CMD_OPEN_LIBRARY,
   CMD_CLOSE_LIBRARY,
-  CMD_RUN_FUNCTION,
+  CMD_PIPELINE_CREATE,
+  CMD_PIPELINE_DESTROY,
+  CMD_PIPELINE_RUN_FUNCTION,
   CMD_SHUTDOWN
 } cmd_t;
 
diff --git a/liboffloadmic/runtime/emulator/coi_device.cpp b/liboffloadmic/runtime/emulator/coi_device.cpp
index 8773a7910ce6..f9dd2cde8885 100644
--- a/liboffloadmic/runtime/emulator/coi_device.cpp
+++ b/liboffloadmic/runtime/emulator/coi_device.cpp
@@ -35,6 +35,7 @@
 
 
 static uint32_t engine_index;
+static char *engine_dir;
 
 
 extern "C"
@@ -68,7 +69,7 @@ SYMBOL_VERSION (COIEngineGetIndex, 1) (COI_ISA_TYPE *type,
 {
   COITRACE ("COIEngineGetIndex");
 
-  /* type is not used in liboffload.  */
+  /* type is not used in liboffloadmic.  */
   *index = engine_index;
 
   return COI_SUCCESS;
@@ -86,50 +87,144 @@ SYMBOL_VERSION (COIPipelineStartExecutingRunFunctions, 1) ()
 }
 
 
+/* The start routine for the COI pipeline thread.  */
+
+static void *
+pipeline_thread_routine (void *in_pipeline_num)
+{
+  uint32_t pipeline_num = *(uint32_t *) in_pipeline_num;
+  free (in_pipeline_num);
+
+  /* Open pipes.  */
+  char *pipe_host2tgt_path, *pipe_tgt2host_path;
+  MALLOCN (char *, pipe_host2tgt_path,
+	  strlen (engine_dir) + sizeof (PIPE_HOST2TGT_NAME "0000000000"));
+  MALLOCN (char *, pipe_tgt2host_path,
+	  strlen (engine_dir) + sizeof (PIPE_TGT2HOST_NAME "0000000000"));
+  sprintf (pipe_host2tgt_path, "%s" PIPE_HOST2TGT_NAME "%010d", engine_dir,
+	   pipeline_num);
+  sprintf (pipe_tgt2host_path, "%s" PIPE_TGT2HOST_NAME "%010d", engine_dir,
+	   pipeline_num);
+  int pipe_host2tgt = open (pipe_host2tgt_path, O_CLOEXEC | O_RDONLY);
+  if (pipe_host2tgt < 0)
+    COIERRORN ("Cannot open host-to-target pipe.");
+  int pipe_tgt2host = open (pipe_tgt2host_path, O_CLOEXEC | O_WRONLY);
+  if (pipe_tgt2host < 0)
+    COIERRORN ("Cannot open target-to-host pipe.");
+
+  free (pipe_host2tgt_path);
+  free (pipe_tgt2host_path);
+
+  while (1)
+    {
+      /* Read and execute command.  */
+      cmd_t cmd = CMD_PIPELINE_DESTROY;
+      int cmd_len = read (pipe_host2tgt, &cmd, sizeof (cmd_t));
+      if (cmd_len != sizeof (cmd_t) && cmd_len != 0)
+	COIERRORN ("Cannot read from pipe.");
+
+      if (cmd == CMD_PIPELINE_DESTROY)
+	break;
+      else if (cmd == CMD_PIPELINE_RUN_FUNCTION)
+	{
+	  /* Receive data from host.  */
+	  void (*func) (uint32_t, void **, uint64_t *, void *, uint16_t, void *,
+			uint16_t);
+	  uint32_t buffer_count;
+	  READN (pipe_host2tgt, &func, sizeof (void *));
+	  READN (pipe_host2tgt, &buffer_count, sizeof (uint32_t));
+	  void **buffers;
+	  uint64_t *buffers_len;
+	  MALLOCN (void **, buffers, buffer_count * sizeof (void *));
+	  MALLOCN (uint64_t *, buffers_len, buffer_count * sizeof (uint64_t));
+	  for (uint32_t i = 0; i < buffer_count; i++)
+	    {
+	      READN (pipe_host2tgt, &buffers_len[i], sizeof (uint64_t));
+	      READN (pipe_host2tgt, &buffers[i], sizeof (void *));
+	    }
+	  uint16_t misc_data_len;
+	  READN (pipe_host2tgt, &misc_data_len, sizeof (uint16_t));
+	  void *misc_data = NULL;
+	  if (misc_data_len > 0)
+	    {
+	      MALLOCN (void *, misc_data, misc_data_len);
+	      READN (pipe_host2tgt, misc_data, misc_data_len);
+	    }
+	  uint16_t return_data_len;
+	  READN (pipe_host2tgt, &return_data_len, sizeof (uint16_t));
+	  void *return_data;
+	  if (return_data_len > 0)
+	    MALLOCN (void *, return_data, return_data_len);
+
+	  /* Run function.  */
+	  func (buffer_count, buffers, buffers_len, misc_data,
+		misc_data_len, return_data, return_data_len);
+
+	  /* Send data to host if any or just send notification.  */
+	  WRITEN (pipe_tgt2host, return_data_len > 0 ? return_data : &cmd,
+		  return_data_len > 0 ? return_data_len : sizeof (cmd_t));
+
+	  /* Clean up.  */
+	  free (buffers);
+	  free (buffers_len);
+	  if (misc_data_len > 0)
+	    free (misc_data);
+	  if (return_data_len > 0)
+	    free (return_data);
+	}
+      else
+	COIERRORN ("Unrecognizable command from host.");
+    }
+
+  /* Close pipes.  */
+  if (close (pipe_host2tgt) < 0)
+    COIERRORN ("Cannot close host-to-target pipe.");
+  if (close (pipe_tgt2host) < 0)
+    COIERRORN ("Cannot close target-to-host pipe.");
+
+  return NULL;
+}
+
+
 COIRESULT
 SYMBOL_VERSION (COIProcessWaitForShutdown, 1) ()
 {
   COITRACE ("COIProcessWaitForShutdown");
 
-  char *mic_dir = getenv (MIC_DIR_ENV);
+  engine_dir = getenv (MIC_DIR_ENV);
   char *mic_index = getenv (MIC_INDEX_ENV);
-  char *pipe_host_path, *pipe_target_path;
-  int pipe_host, pipe_target;
-  int cmd_len;
-  pid_t ppid = getppid ();
-  cmd_t cmd;
-
-  assert (mic_dir != NULL && mic_index != NULL);
+  assert (engine_dir != NULL && mic_index != NULL);
 
   /* Get engine index.  */
   engine_index = atoi (mic_index);
 
-  /* Open pipes.  */
-  MALLOC (char *, pipe_host_path,
-	  strlen (PIPE_HOST_PATH) + strlen (mic_dir) + 1);
-  MALLOC (char *, pipe_target_path,
-	  strlen (PIPE_TARGET_PATH) + strlen (mic_dir) + 1);
-  sprintf (pipe_host_path, "%s" PIPE_HOST_PATH, mic_dir);
-  sprintf (pipe_target_path, "%s" PIPE_TARGET_PATH, mic_dir);
-  pipe_host = open (pipe_host_path, O_CLOEXEC | O_WRONLY);
-  if (pipe_host < 0)
-    COIERROR ("Cannot open target-to-host pipe.");
-  pipe_target = open (pipe_target_path, O_CLOEXEC | O_RDONLY);
-  if (pipe_target < 0)
-    COIERROR ("Cannot open host-to-target pipe.");
+  /* Open main pipes.  */
+  char *pipe_host2tgt_path, *pipe_tgt2host_path;
+  MALLOC (char *, pipe_host2tgt_path,
+	  strlen (engine_dir) + sizeof (PIPE_HOST2TGT_NAME "mainpipe"));
+  MALLOC (char *, pipe_tgt2host_path,
+	  strlen (engine_dir) + sizeof (PIPE_TGT2HOST_NAME "mainpipe"));
+  sprintf (pipe_host2tgt_path, "%s" PIPE_HOST2TGT_NAME "mainpipe", engine_dir);
+  sprintf (pipe_tgt2host_path, "%s" PIPE_TGT2HOST_NAME "mainpipe", engine_dir);
+  int pipe_host2tgt = open (pipe_host2tgt_path, O_CLOEXEC | O_RDONLY);
+  if (pipe_host2tgt < 0)
+    COIERROR ("Cannot open host-to-target main pipe.");
+  int pipe_tgt2host = open (pipe_tgt2host_path, O_CLOEXEC | O_WRONLY);
+  if (pipe_tgt2host < 0)
+    COIERROR ("Cannot open target-to-host main pipe.");
 
   /* Clean up.  */
-  free (pipe_host_path);
-  free (pipe_target_path);
+  free (pipe_host2tgt_path);
+  free (pipe_tgt2host_path);
 
   /* Handler.  */
   while (1)
     {
       /* Read and execute command.  */
-      cmd = CMD_SHUTDOWN;
-      cmd_len = read (pipe_target, &cmd, sizeof (cmd_t));
+      cmd_t cmd = CMD_SHUTDOWN;
+      int cmd_len = read (pipe_host2tgt, &cmd, sizeof (cmd_t));
       if (cmd_len != sizeof (cmd_t) && cmd_len != 0)
-	COIERROR ("Cannot read from pipe.");
+	COIERROR ("Cannot read from main pipe.");
 
       switch (cmd)
 	{
@@ -139,34 +234,33 @@ SYMBOL_VERSION (COIProcessWaitForShutdown, 1) ()
 	    void *dest, *source;
 
 	    /* Receive data from host.  */
-	    READ (pipe_target, &dest, sizeof (void *));
-	    READ (pipe_target, &source, sizeof (void *));
-	    READ (pipe_target, &len, sizeof (uint64_t));
+	    READ (pipe_host2tgt, &dest, sizeof (void *));
+	    READ (pipe_host2tgt, &source, sizeof (void *));
+	    READ (pipe_host2tgt, &len, sizeof (uint64_t));
 
 	    /* Copy.  */
 	    memcpy (dest, source, len);
 
 	    /* Notify host about completion.  */
-	    WRITE (pipe_host, &cmd, sizeof (cmd_t));
+	    WRITE (pipe_tgt2host, &cmd, sizeof (cmd_t));
 
 	    break;
 	  }
 	case CMD_BUFFER_MAP:
 	  {
 	    char *name;
-	    int fd;
 	    size_t len;
 	    uint64_t buffer_len;
 	    void *buffer;
 
 	    /* Receive data from host.  */
-	    READ (pipe_target, &len, sizeof (size_t));
+	    READ (pipe_host2tgt, &len, sizeof (size_t));
 	    MALLOC (char *, name, len);
-	    READ (pipe_target, name, len);
-	    READ (pipe_target, &buffer_len, sizeof (uint64_t));
+	    READ (pipe_host2tgt, name, len);
+	    READ (pipe_host2tgt, &buffer_len, sizeof (uint64_t));
 
 	    /* Open shared memory.  */
-	    fd = shm_open (name, O_CLOEXEC | O_RDWR, S_IRUSR | S_IWUSR);
+	    int fd = shm_open (name, O_CLOEXEC | O_RDWR, S_IRUSR | S_IWUSR);
 	    if (fd < 0)
 	      COIERROR ("Cannot open shared memory.");
 
@@ -177,8 +271,8 @@ SYMBOL_VERSION (COIProcessWaitForShutdown, 1) ()
 	      COIERROR ("Cannot map shared memory.");
 
 	    /* Send data to host.  */
-	    WRITE (pipe_host, &fd, sizeof (int));
-	    WRITE (pipe_host, &buffer, sizeof (void *));
+	    WRITE (pipe_tgt2host, &fd, sizeof (int));
+	    WRITE (pipe_tgt2host, &buffer, sizeof (void *));
 
 	    /* Clean up.  */
 	    free (name);
@@ -192,9 +286,9 @@ SYMBOL_VERSION (COIProcessWaitForShutdown, 1) ()
 	    void *buffer;
 
 	    /* Receive data from host.  */
-	    READ (pipe_target, &fd, sizeof (int));
-	    READ (pipe_target, &buffer, sizeof (void *));
-	    READ (pipe_target, &buffer_len, sizeof (uint64_t));
+	    READ (pipe_host2tgt, &fd, sizeof (int));
+	    READ (pipe_host2tgt, &buffer, sizeof (void *));
+	    READ (pipe_host2tgt, &buffer_len, sizeof (uint64_t));
 
 	    /* Unmap buffer.  */
 	    if (munmap (buffer, buffer_len) < 0)
@@ -205,7 +299,7 @@ SYMBOL_VERSION (COIProcessWaitForShutdown, 1) ()
 	      COIERROR ("Cannot close shared memory file.");
 
 	    /* Notify host about completion.  */
-	    WRITE (pipe_host, &cmd, sizeof (cmd_t));
+	    WRITE (pipe_tgt2host, &cmd, sizeof (cmd_t));
 
 	    break;
 	  }
@@ -213,20 +307,19 @@ SYMBOL_VERSION (COIProcessWaitForShutdown, 1) ()
 	  {
 	    char *name;
 	    size_t len;
-	    void *ptr;
 
 	    /* Receive data from host.  */
-	    READ (pipe_target, &len, sizeof (size_t));
+	    READ (pipe_host2tgt, &len, sizeof (size_t));
 	    MALLOC (char *, name, len);
-	    READ (pipe_target, name, len);
+	    READ (pipe_host2tgt, name, len);
 
 	    /* Find function.  */
-	    ptr = dlsym (RTLD_DEFAULT, name);
+	    void *ptr = dlsym (RTLD_DEFAULT, name);
 	    if (ptr == NULL)
 	      COIERROR ("Cannot find symbol %s.", name);
 
 	    /* Send data to host.  */
-	    WRITE (pipe_host, &ptr, sizeof (void *));
+	    WRITE (pipe_tgt2host, &ptr, sizeof (void *));
 
 	    /* Clean up.  */
 	    free (name);
@@ -237,20 +330,19 @@ SYMBOL_VERSION (COIProcessWaitForShutdown, 1) ()
 	  {
 	    char *lib_path;
 	    size_t len;
-	    void *handle;
 
 	    /* Receive data from host.  */
-	    READ (pipe_target, &len, sizeof (size_t));
+	    READ (pipe_host2tgt, &len, sizeof (size_t));
 	    MALLOC (char *, lib_path, len);
-	    READ (pipe_target, lib_path, len);
+	    READ (pipe_host2tgt, lib_path, len);
 
 	    /* Open library.  */
-	    handle = dlopen (lib_path, RTLD_LAZY | RTLD_GLOBAL);
+	    void *handle = dlopen (lib_path, RTLD_LAZY | RTLD_GLOBAL);
 	    if (handle == NULL)
 	      COIERROR ("Cannot load %s: %s", lib_path, dlerror ());
 
 	    /* Send data to host.  */
-	    WRITE (pipe_host, &handle, sizeof (void *));
+	    WRITE (pipe_tgt2host, &handle, sizeof (void *));
 
 	    /* Clean up.  */
 	    free (lib_path);
@@ -261,67 +353,30 @@ SYMBOL_VERSION (COIProcessWaitForShutdown, 1) ()
 	  {
 	    /* Receive data from host.  */
 	    void *handle;
-	    READ (pipe_target, &handle, sizeof (void *));
+	    READ (pipe_host2tgt, &handle, sizeof (void *));
 
 	    dlclose (handle);
 
 	    break;
 	  }
-	case CMD_RUN_FUNCTION:
+	case CMD_PIPELINE_CREATE:
 	  {
-	    uint16_t misc_data_len, return_data_len;
-	    uint32_t buffer_count, i;
-	    uint64_t *buffers_len, size;
-	    void *ptr;
-	    void **buffers, *misc_data, *return_data;
-
-	    void (*func) (uint32_t, void **, uint64_t *,
-			  void *, uint16_t, void*, uint16_t);
-
 	    /* Receive data from host.  */
-	    READ (pipe_target, &func, sizeof (void *));
-	    READ (pipe_target, &buffer_count, sizeof (uint32_t));
-	    MALLOC (void **, buffers, buffer_count * sizeof (void *));
-	    MALLOC (uint64_t *, buffers_len, buffer_count * sizeof (uint64_t));
-
-	    for (i = 0; i < buffer_count; i++)
-	      {
-		READ (pipe_target, &(buffers_len[i]), sizeof (uint64_t));
-		READ (pipe_target, &(buffers[i]), sizeof (void *));
-	      }
-	    READ (pipe_target, &misc_data_len, sizeof (uint16_t));
-	    if (misc_data_len > 0)
-	      {
-		MALLOC (void *, misc_data, misc_data_len);
-		READ (pipe_target, misc_data, misc_data_len);
-	      }
-	    READ (pipe_target, &return_data_len, sizeof (uint16_t));
-	    if (return_data_len > 0)
-	      MALLOC (void *, return_data, return_data_len);
-
-	    /* Run function.  */
-	    func (buffer_count, buffers, buffers_len, misc_data,
-		  misc_data_len, return_data, return_data_len);
-
-	    /* Send data to host if any or just send notification.  */
-	    WRITE (pipe_host, return_data_len > 0 ? return_data : &cmd,
-		   return_data_len > 0 ? return_data_len : sizeof (cmd_t));
-
-	    /* Clean up.  */
-	    free (buffers);
-	    free (buffers_len);
-	    if (misc_data_len > 0)
-	      free (misc_data);
-	    if (return_data_len > 0)
-	      free (return_data);
-
+	    uint32_t *pipeline_num = (uint32_t *) malloc (sizeof (uint32_t));
+	    READ (pipe_host2tgt, pipeline_num, sizeof (*pipeline_num));
+
+	    /* Create a new thread for the pipeline.  */
+	    pthread_t thread;
+	    if (pthread_create (&thread, NULL, pipeline_thread_routine,
+				pipeline_num))
+	      COIERROR ("Cannot create new thread.");
 	    break;
 	  }
 	case CMD_SHUTDOWN:
-	  if (close (pipe_host) < 0)
-	    COIERROR ("Cannot close target-to-host pipe.");
-	  if (close (pipe_target) < 0)
-	    COIERROR ("Cannot close host-to-target pipe.");
+	  if (close (pipe_host2tgt) < 0)
+	    COIERROR ("Cannot close host-to-target main pipe.");
+	  if (close (pipe_tgt2host) < 0)
+	    COIERROR ("Cannot close target-to-host main pipe.");
 	  return COI_SUCCESS;
 	default:
 	  COIERROR ("Unrecognizable command from host.");
diff --git a/liboffloadmic/runtime/emulator/coi_device.h b/liboffloadmic/runtime/emulator/coi_device.h
index 616c91849ace..2b842e3ec17c 100644
--- a/liboffloadmic/runtime/emulator/coi_device.h
+++ b/liboffloadmic/runtime/emulator/coi_device.h
@@ -41,6 +41,16 @@
   return COI_ERROR;			    \
 }
 
+/* Like COIERROR, but return NULL instead of COIRESULT.  */
+#define COIERRORN(...)			    \
+{					    \
+  fprintf (stderr, "COI ERROR - TARGET: "); \
+  fprintf (stderr, __VA_ARGS__);	    \
+  fprintf (stderr, "\n");		    \
+  perror (NULL);			    \
+  return NULL;				    \
+}
+
 #ifdef DEBUG
   #define COITRACE(...)			      \
   {					      \
diff --git a/liboffloadmic/runtime/emulator/coi_host.cpp b/liboffloadmic/runtime/emulator/coi_host.cpp
index cdc04c208e43..960c59ecff38 100644
--- a/liboffloadmic/runtime/emulator/coi_host.cpp
+++ b/liboffloadmic/runtime/emulator/coi_host.cpp
@@ -27,60 +27,71 @@
     OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
+#include <set>
+#include <map>
+#include <queue>
+
 #include "coi_host.h"
 
 #include "coi_version_asm.h"
 
 #define CYCLE_FREQUENCY     1000000000
 
-/* Environment variables.  */
-extern char **environ;
-
-/* List of directories for removing on exit.  */
-char **tmp_dirs;
-unsigned tmp_dirs_num = 0;
-
-/* Number of emulated MIC engines.  */
-long num_engines;
-
-/* Mutex to sync parallel execution.  */
-pthread_mutex_t mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
-
-
-typedef enum
+enum buffer_t
 {
   BUFFER_NORMAL,
   BUFFER_MEMORY
-} buffer_t;
+};
 
-typedef struct
+struct Engine
 {
   COI_ISA_TYPE type;
   uint32_t index;
   char *dir;
-} Engine;
+};
 
-typedef struct
+struct Function
 {
-  char *name;
   void *ptr;
-} Function;
-
-typedef struct
+  uint32_t num_buffers;
+  uint64_t *bufs_size;
+  void * *bufs_data_target;
+  uint16_t misc_data_len;
+  void *misc_data;
+  uint16_t return_value_len;
+  void *return_value;
+  COIEVENT completion_event;
+};
+
+struct Callback
 {
-  int pipe_host;
-  int pipe_target;
-} Pipeline;
+  COI_EVENT_CALLBACK ptr;
+  const void *data;
+};
 
-typedef struct
+struct Process
 {
   pid_t pid;
+  int pipe_host2tgt;
+  int pipe_tgt2host;
   Engine *engine;
-  Function **functions;
-  Pipeline *pipeline;
-} Process;
+  void **functions;
+};
 
-typedef struct
+struct Pipeline
+{
+  pthread_t thread;
+  bool destroy;
+  bool is_destroyed;
+  char *pipe_host2tgt_path;
+  char *pipe_tgt2host_path;
+  int pipe_host2tgt;
+  int pipe_tgt2host;
+  std::queue<Function> queue;
+  Process *process;
+};
+
+struct Buffer
 {
   buffer_t type;
   char *name;
@@ -90,7 +101,39 @@ typedef struct
   void *data;
   void *data_target;
   Process *process;
-} Buffer;
+};
+
+
+/* Environment variables.  */
+extern char **environ;
+
+/* List of directories for removing on exit.  */
+static char **tmp_dirs;
+static unsigned tmp_dirs_num;
+
+/* Number of emulated MIC engines.  */
+static long num_engines;
+
+/* Number of the last COI pipeline.  */
+static uint32_t max_pipeline_num;
+
+/* Set of undestroyed pipelines.  */
+static std::set<Pipeline *> pipelines;
+
+/* Number of the last COI event, the event #0 is always signalled.  */
+static uint64_t max_event_num = 1;
+
+/* Set of created COI events, which are not signalled.  */
+static std::set<uint64_t> non_signalled_events;
+
+/* Set of COI events, which encountered errors.  */
+static std::map<uint64_t, COIRESULT> errored_events;
+
+/* Set of registered callbacks, indexed by event number.  */
+static std::map<uint64_t, Callback> callbacks;
+
+/* Mutex to sync parallel execution.  */
+static pthread_mutex_t mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
 
 
 static COIRESULT
@@ -168,14 +211,75 @@ __attribute__((destructor))
 static void
 cleanup ()
 {
-  unsigned i;
-  for (i = 0; i < tmp_dirs_num; i++)
+  for (unsigned i = 0; i < tmp_dirs_num; i++)
     {
       remove_directory (tmp_dirs[i]);
       free (tmp_dirs[i]);
     }
-  if (tmp_dirs)
-    free (tmp_dirs);
+  free (tmp_dirs);
+}
+
+static COIRESULT
+start_critical_section ()
+{
+  if (pthread_mutex_lock (&mutex) != 0)
+    COIERROR ("Cannot lock mutex.");
+  return COI_SUCCESS;
+}
+
+static COIRESULT
+finish_critical_section ()
+{
+  if (pthread_mutex_unlock (&mutex) != 0)
+    COIERROR ("Cannot unlock mutex.");
+  return COI_SUCCESS;
+}
+
+static bool
+pipeline_is_destroyed (const Pipeline *pipeline)
+{
+  start_critical_section ();
+  bool res = pipeline->is_destroyed;
+  finish_critical_section ();
+  return res;
+}
+
+static void
+maybe_invoke_callback (const COIEVENT event, const COIRESULT result)
+{
+  std::map<uint64_t, Callback>::iterator cb = callbacks.find (event.opaque[0]);
+
+  if (cb != callbacks.end ())
+    {
+      Callback callback = cb->second;
+      callback.ptr (event, result, callback.data);
+      callbacks.erase (cb);
+    }
+}
+
+static void
+signal_event (const COIEVENT event, const COIRESULT result)
+{
+  if (result != COI_SUCCESS)
+    errored_events.insert (std::pair <uint64_t, COIRESULT> (event.opaque[0],
+							    result));
+  non_signalled_events.erase (event.opaque[0]);
+
+  maybe_invoke_callback (event, result);
+}
+
+static COIRESULT
+get_event_result (const COIEVENT event)
+{
+  COIRESULT res = COI_SUCCESS;
+
+  std::map<uint64_t, COIRESULT>::iterator ee
+    = errored_events.find (event.opaque[0]);
+
+  if (ee != errored_events.end ())
+    res = ee->second;
+
+  return res;
 }
 
 
@@ -183,75 +287,79 @@ extern "C"
 {
 
 COIRESULT
-SYMBOL_VERSION (COIBufferCopy, 1) (COIBUFFER dest_buffer,
-				   COIBUFFER source_buffer,
-				   uint64_t dest_offset,
-				   uint64_t source_offset,
-				   uint64_t length,
-				   COI_COPY_TYPE type,
-				   uint32_t dependencies_num,     // Ignored
-				   const COIEVENT *dependencies,  // Ignored
-				   COIEVENT *completion)	  // Ignored
+SYMBOL_VERSION (COIBufferCopy, 1) (COIBUFFER in_DestBuffer,
+				   COIBUFFER in_SourceBuffer,
+				   uint64_t in_DestOffset,
+				   uint64_t in_SourceOffset,
+				   uint64_t in_Length,
+				   COI_COPY_TYPE in_Type,
+				   uint32_t in_NumDependencies,
+				   const COIEVENT *in_pDependencies,  // Ignored
+				   COIEVENT *out_pCompletion)
 {
   COITRACE ("COIBufferCopy");
 
+  /* Features of liboffloadmic.  */
+  assert (in_DestBuffer != NULL);
+  assert (in_SourceBuffer != NULL);
+  assert (in_Type == COI_COPY_UNSPECIFIED);
+  assert (in_NumDependencies == 0);
+
   /* Convert input arguments.  */
-  Buffer *dest = (Buffer *) dest_buffer;
-  Buffer *source = (Buffer *) source_buffer;
+  Buffer *dest = (Buffer *) in_DestBuffer;
+  Buffer *source = (Buffer *) in_SourceBuffer;
 
-  /* Features of liboffload.  */
-  assert (type == COI_COPY_UNSPECIFIED);
-
-  /* Start critical section.  */
-  if (pthread_mutex_lock (&mutex) != 0)
-    COIERROR ("Cannot lock mutex.");
+  start_critical_section ();
 
   /* Map buffers if needed.  */
   if (dest->data == 0 && dest->type == BUFFER_NORMAL)
-    if (COIBufferMap (dest_buffer, 0, dest->size, (COI_MAP_TYPE) 0,
+    if (COIBufferMap (in_DestBuffer, 0, dest->size, (COI_MAP_TYPE) 0,
 		      0, 0, 0, 0, 0) == COI_ERROR)
       return COI_ERROR;
   if (source->data == 0 && source->type == BUFFER_NORMAL)
-    if (COIBufferMap (source_buffer, 0, source->size, (COI_MAP_TYPE) 0,
+    if (COIBufferMap (in_SourceBuffer, 0, source->size, (COI_MAP_TYPE) 0,
 		      0, 0, 0, 0, 0) == COI_ERROR)
       return COI_ERROR;
 
   /* Copy data.  */
   if (source->data != 0 && dest->data != 0)
-    memcpy ((void *) ((uintptr_t) dest->data+dest_offset),
-	    (void *) ((uintptr_t) source->data+source_offset), length);
+    memcpy ((void *) ((uintptr_t) dest->data + in_DestOffset),
+	    (void *) ((uintptr_t) source->data + in_SourceOffset), in_Length);
   else
     {
       assert (dest->process == source->process);
 
       Buffer *buffer;
       cmd_t cmd = CMD_BUFFER_COPY;
-      Pipeline *pipeline = dest->process->pipeline;
 
       /* Create intermediary buffer.  */
-      if (COIBufferCreate (length, COI_BUFFER_NORMAL, 0, 0, 1,
+      if (COIBufferCreate (in_Length, COI_BUFFER_NORMAL, 0, 0, 1,
 			   (COIPROCESS*) &dest->process,
 			   (COIBUFFER *) &buffer) == COI_ERROR)
 	return COI_ERROR;
 
+      int pipe_host2tgt = dest->process->pipe_host2tgt;
+      int pipe_tgt2host = dest->process->pipe_tgt2host;
+
       /* Copy from source to intermediary buffer.  */
       if (source->data == 0)
 	{
 	  assert (source->data_target != 0);
 
 	  /* Send data to target.  */
-	  WRITE (pipeline->pipe_target, &cmd, sizeof (cmd_t));
-	  WRITE (pipeline->pipe_target, &(buffer->data_target), sizeof (void *));
-	  WRITE (pipeline->pipe_target, &(source->data_target), sizeof (void *));
-	  WRITE (pipeline->pipe_target, &(buffer->size), sizeof (uint64_t));
+	  WRITE (pipe_host2tgt, &cmd, sizeof (cmd_t));
+	  WRITE (pipe_host2tgt, &buffer->data_target, sizeof (void *));
+	  WRITE (pipe_host2tgt, &source->data_target, sizeof (void *));
+	  WRITE (pipe_host2tgt, &buffer->size, sizeof (uint64_t));
 
-	  /* Receive data from  target.  */
-	  READ (pipeline->pipe_host, &cmd, sizeof (cmd_t));
+	  /* Receive data from target.  */
+	  READ (pipe_tgt2host, &cmd, sizeof (cmd_t));
 	}
       else
 	{
-	  if (COIBufferCopy ((COIBUFFER) buffer, source_buffer, 0, source_offset,
-			     length, type, 0, 0, 0) == COI_ERROR)
+	  if (COIBufferCopy ((COIBUFFER) buffer, in_SourceBuffer, 0,
+			     in_SourceOffset, in_Length, in_Type, 0, 0, 0)
+	      == COI_ERROR)
 	    return COI_ERROR;
 	}
 
@@ -261,18 +369,18 @@ SYMBOL_VERSION (COIBufferCopy, 1) (COIBUFFER dest_buffer,
 	  assert (dest->data_target != 0);
 
 	  /* Send data to target.  */
-	  WRITE (pipeline->pipe_target, &cmd, sizeof (cmd_t));
-	  WRITE (pipeline->pipe_target, &(dest->data_target), sizeof (void *));
-	  WRITE (pipeline->pipe_target, &(buffer->data_target), sizeof (void *));
-	  WRITE (pipeline->pipe_target, &(buffer->size), sizeof (uint64_t));
+	  WRITE (pipe_host2tgt, &cmd, sizeof (cmd_t));
+	  WRITE (pipe_host2tgt, &dest->data_target, sizeof (void *));
+	  WRITE (pipe_host2tgt, &buffer->data_target, sizeof (void *));
+	  WRITE (pipe_host2tgt, &buffer->size, sizeof (uint64_t));
 
-	  /* Receive data from  target.  */
-	  READ (pipeline->pipe_host, &cmd, sizeof (cmd_t));
+	  /* Receive data from target.  */
+	  READ (pipe_tgt2host, &cmd, sizeof (cmd_t));
 	}
       else
 	{
-	  if (COIBufferCopy (dest_buffer, (COIBUFFER) buffer, dest_offset,
-			     0, length, type, 0, 0, 0) == COI_ERROR)
+	  if (COIBufferCopy (in_DestBuffer, (COIBUFFER) buffer, in_DestOffset,
+			     0, in_Length, in_Type, 0, 0, 0) == COI_ERROR)
 	    return COI_ERROR;
 	}
 
@@ -289,89 +397,84 @@ SYMBOL_VERSION (COIBufferCopy, 1) (COIBUFFER dest_buffer,
     if (COIBufferUnmap ((COIMAPINSTANCE) source, 0, 0, 0) == COI_ERROR)
       return COI_ERROR;
 
-  /* Finish critical section.  */
-  if (pthread_mutex_unlock (&mutex) != 0)
-    COIERROR ("Cannot unlock mutex.");
+  finish_critical_section ();
+
+  if (out_pCompletion)
+    out_pCompletion->opaque[0] = 0;
 
   return COI_SUCCESS;
 }
 
 
 COIRESULT
-SYMBOL_VERSION (COIBufferCreate, 1) (uint64_t size,
-				     COI_BUFFER_TYPE type,
-				     uint32_t flags,
-				     const void *init_data,
-				     uint32_t processes_num,
-				     const COIPROCESS *processes,
-				     COIBUFFER *buffer)
+SYMBOL_VERSION (COIBufferCreate, 1) (uint64_t in_Size,
+				     COI_BUFFER_TYPE in_Type,
+				     uint32_t in_Flags,
+				     const void *in_pInitData,
+				     uint32_t in_NumProcesses,
+				     const COIPROCESS *in_pProcesses,
+				     COIBUFFER *out_pBuffer)
 {
   COITRACE ("COIBufferCreate");
 
   char *shm_name;
-  cmd_t cmd = CMD_BUFFER_MAP;
   int shm_fd;
   const int ullong_max_len = 20;
-  size_t len;
-  unsigned long long i;
-
-  Buffer *buf;
-  Pipeline *pipeline;
 
-  /* Features of liboffload.  */
-  assert (type == COI_BUFFER_NORMAL);
-  assert ((flags & COI_SINK_MEMORY) == 0);
-  assert ((flags & COI_SAME_ADDRESS_SINKS) == 0);
-  assert ((flags & COI_SAME_ADDRESS_SINKS_AND_SOURCE) == 0);
-  assert (init_data == 0);
-  assert (processes_num == 1);
+  /* Features of liboffloadmic.  */
+  assert (in_Type == COI_BUFFER_NORMAL);
+  assert ((in_Flags & COI_SINK_MEMORY) == 0);
+  assert ((in_Flags & COI_SAME_ADDRESS_SINKS) == 0);
+  assert ((in_Flags & COI_SAME_ADDRESS_SINKS_AND_SOURCE) == 0);
+  assert (in_pInitData == NULL);
+  assert (in_NumProcesses == 1);
+  assert (in_pProcesses != NULL);
+  assert (out_pBuffer != NULL);
 
   /* Create shared memory with an unique name.  */
   MALLOC (char *, shm_name, strlen (SHM_NAME) + ullong_max_len + 1);
-  for (i = 0; i >= 0; i++)
+  for (unsigned long long i = 0; i >= 0; i++)
     {
-      sprintf (shm_name, SHM_NAME"%lu", i);
+      sprintf (shm_name, SHM_NAME "%lu", i);
       shm_fd = shm_open (shm_name, O_CLOEXEC | O_CREAT | O_EXCL | O_RDWR,
 			 S_IRUSR | S_IWUSR);
       if (shm_fd > 0)
 	break;
     }
-  if (ftruncate (shm_fd, size) < 0)
+  if (ftruncate (shm_fd, in_Size) < 0)
     COIERROR ("Cannot truncate shared memory file.");
 
   /* Create buffer.  */
-  MALLOC (Buffer *, buf, sizeof (Buffer));
+  Buffer *buf = new Buffer;
   buf->data = 0;
   buf->fd = shm_fd;
-  buf->process = (Process *) processes[0];
-  buf->size = size;
+  buf->process = (Process *) in_pProcesses[0];
+  buf->size = in_Size;
   buf->type = BUFFER_NORMAL;
   STRDUP (buf->name, shm_name);
 
   /* Map buffer on target.  */
-  len = strlen (buf->name) + 1;
-  pipeline = buf->process->pipeline;
+  size_t len = strlen (buf->name) + 1;
 
-  /* Start critical section.  */
-  if (pthread_mutex_lock (&mutex) != 0)
-    COIERROR ("Cannot lock mutex.");
+  start_critical_section ();
 
   /* Send data to target.  */
-  WRITE (pipeline->pipe_target, &cmd, sizeof (cmd_t));
-  WRITE (pipeline->pipe_target, &len, sizeof (size_t));
-  WRITE (pipeline->pipe_target, buf->name, len);
-  WRITE (pipeline->pipe_target, &(buf->size), sizeof (uint64_t));
+  const cmd_t cmd = CMD_BUFFER_MAP;
+  int pipe_host2tgt = buf->process->pipe_host2tgt;
+  WRITE (pipe_host2tgt, &cmd, sizeof (cmd_t));
+  WRITE (pipe_host2tgt, &len, sizeof (size_t));
+  WRITE (pipe_host2tgt, buf->name, len);
+  WRITE (pipe_host2tgt, &buf->size, sizeof (uint64_t));
 
-  /* Receive data from  target.  */
-  READ (pipeline->pipe_host, &(buf->fd_target), sizeof (int));
-  READ (pipeline->pipe_host, &(buf->data_target), sizeof (void *));
+  /* Receive data from target.  */
+  int pipe_tgt2host = buf->process->pipe_tgt2host;
+  READ (pipe_tgt2host, &buf->fd_target, sizeof (int));
+  READ (pipe_tgt2host, &buf->data_target, sizeof (void *));
 
-  /* Finish critical section.  */
-  if (pthread_mutex_unlock (&mutex) != 0)
-    COIERROR ("Cannot unlock mutex.");
+  finish_critical_section ();
 
   /* Prepare output arguments.  */
-  *buffer = (COIBUFFER) buf;
+  *out_pBuffer = (COIBUFFER) buf;
 
   /* Clean up.  */
   free (shm_name);
@@ -381,74 +484,72 @@ SYMBOL_VERSION (COIBufferCreate, 1) (uint64_t size,
 
 
 COIRESULT
-SYMBOL_VERSION (COIBufferCreateFromMemory, 1) (uint64_t size,
-					       COI_BUFFER_TYPE type,
-					       uint32_t flags,
-					       void *memory,
-					       uint32_t processes_num,
-					       const COIPROCESS *processes,
-					       COIBUFFER *buffer)
+SYMBOL_VERSION (COIBufferCreateFromMemory, 1) (uint64_t in_Size,
+					       COI_BUFFER_TYPE in_Type,
+					       uint32_t in_Flags,
+					       void *in_Memory,
+					       uint32_t in_NumProcesses,
+					       const COIPROCESS *in_pProcesses,
+					       COIBUFFER *out_pBuffer)
 {
   COITRACE ("COIBufferCreateFromMemory");
 
-  Buffer *buf;
-
-  /* Features of liboffload.  */
-  assert (type == COI_BUFFER_NORMAL);
-  assert ((flags & COI_SAME_ADDRESS_SINKS) == 0);
-  assert ((flags & COI_SAME_ADDRESS_SINKS_AND_SOURCE) == 0);
-  assert (processes_num == 1);
+  /* Features of liboffloadmic.  */
+  assert (in_Type == COI_BUFFER_NORMAL);
+  assert ((in_Flags & COI_SAME_ADDRESS_SINKS) == 0);
+  assert ((in_Flags & COI_SAME_ADDRESS_SINKS_AND_SOURCE) == 0);
+  assert (in_NumProcesses == 1);
+  assert (in_pProcesses != NULL);
+  assert (out_pBuffer != NULL);
 
   /* Create buffer.  */
-  MALLOC (Buffer *, buf, sizeof (Buffer));
-  buf->data = (flags & COI_SINK_MEMORY) == 0 ? memory : 0;
-  buf->data_target = (flags & COI_SINK_MEMORY) != 0 ? memory : 0;
-  buf->process = (Process *) processes[0];
-  buf->size = size;
+  Buffer *buf = new Buffer;
+  buf->data = (in_Flags & COI_SINK_MEMORY) == 0 ? in_Memory : 0;
+  buf->data_target = (in_Flags & COI_SINK_MEMORY) != 0 ? in_Memory : 0;
+  buf->process = (Process *) in_pProcesses[0];
+  buf->size = in_Size;
   buf->type = BUFFER_MEMORY;
 
   /* Prepare output argument.  */
-  *buffer = (COIBUFFER) buf;
+  *out_pBuffer = (COIBUFFER) buf;
 
   return COI_SUCCESS;
 }
 
 
 COIRESULT
-SYMBOL_VERSION (COIBufferDestroy, 1) (COIBUFFER buffer)
+SYMBOL_VERSION (COIBufferDestroy, 1) (COIBUFFER in_Buffer)
 {
   COITRACE ("COIBufferDestroy");
 
   cmd_t cmd = CMD_BUFFER_UNMAP;
 
+  assert (in_Buffer != NULL);
+
   /* Convert input arguments.  */
-  Buffer *buf = (Buffer *) buffer;
-  Pipeline *pipeline = buf->process->pipeline;
+  Buffer *buf = (Buffer *) in_Buffer;
 
   /* Unmap buffer on host.  */
   if (buf->data != 0 && buf->type == BUFFER_NORMAL)
-    if (COIBufferUnmap ((COIMAPINSTANCE) buffer, 0, 0, 0) == COI_ERROR)
+    if (COIBufferUnmap ((COIMAPINSTANCE) in_Buffer, 0, 0, 0) == COI_ERROR)
       return COI_ERROR;
 
   /* Unmap buffer on target.  */
   if (buf->data_target != 0)
     {
-      /* Start critical section.  */
-      if (pthread_mutex_lock (&mutex) != 0)
-	COIERROR ("Cannot lock mutex.");
+      start_critical_section ();
 
       /* Send data to target.  */
-      WRITE (pipeline->pipe_target, &cmd, sizeof (cmd_t));
-      WRITE (pipeline->pipe_target, &(buf->fd_target), sizeof (int));
-      WRITE (pipeline->pipe_target, &(buf->data_target), sizeof (void *));
-      WRITE (pipeline->pipe_target, &(buf->size), sizeof (uint64_t));
+      int pipe_host2tgt = buf->process->pipe_host2tgt;
+      WRITE (pipe_host2tgt, &cmd, sizeof (cmd_t));
+      WRITE (pipe_host2tgt, &buf->fd_target, sizeof (int));
+      WRITE (pipe_host2tgt, &buf->data_target, sizeof (void *));
+      WRITE (pipe_host2tgt, &buf->size, sizeof (uint64_t));
 
-      /* Receive data from  target.  */
-      READ (pipeline->pipe_host, &cmd, sizeof (cmd_t));
+      /* Receive data from target.  */
+      READ (buf->process->pipe_tgt2host, &cmd, sizeof (cmd_t));
 
-      /* Finish critical section.  */
-      if (pthread_mutex_unlock (&mutex) != 0)
-	COIERROR ("Cannot unlock mutex.");
+      finish_critical_section ();
     }
 
   /* Unlink shared memory.  */
@@ -462,49 +563,53 @@ SYMBOL_VERSION (COIBufferDestroy, 1) (COIBUFFER buffer)
     }
 
   /* Clean up.  */
-  free (buf);
+  delete buf;
 
   return COI_SUCCESS;
 }
 
 
 COIRESULT
-SYMBOL_VERSION (COIBufferGetSinkAddress, 1) (COIBUFFER buffer,
-					     uint64_t *data)
+SYMBOL_VERSION (COIBufferGetSinkAddress, 1) (COIBUFFER in_Buffer,
+					     uint64_t *out_pAddress)
 {
   COITRACE ("COIBufferGetSinkAddress");
 
+  assert (in_Buffer != NULL);
+  assert (out_pAddress != NULL);
+
   /* Convert input arguments.  */
-  Buffer *buf = (Buffer *) buffer;
+  Buffer *buf = (Buffer *) in_Buffer;
 
   /* Here should come BUFFER_NORMAL buffer.  */
   assert (buf->type == BUFFER_NORMAL);
 
   /* Prepare output argument.  */
-  *data = (uint64_t) buf->data_target;
+  *out_pAddress = (uint64_t) buf->data_target;
 
   return COI_SUCCESS;
 }
 
 
 COIRESULT
-SYMBOL_VERSION (COIBufferMap, 1) (COIBUFFER buffer,
-				  uint64_t offset,
-				  uint64_t length,
-				  COI_MAP_TYPE type,		    // Ignored
-				  uint32_t dependencies_num,	    // Ignored
-				  const COIEVENT *dependencies,     // Ignored
-				  COIEVENT *completion,		    // Ignored
-				  COIMAPINSTANCE *map_instance,
-				  void **data)
+SYMBOL_VERSION (COIBufferMap, 1) (COIBUFFER in_Buffer,
+				  uint64_t in_Offset,
+				  uint64_t in_Length,		    // Ignored
+				  COI_MAP_TYPE in_Type,		    // Ignored
+				  uint32_t in_NumDependencies,
+				  const COIEVENT *in_pDependencies, // Ignored
+				  COIEVENT *out_pCompletion,
+				  COIMAPINSTANCE *out_pMapInstance,
+				  void **out_ppData)
 {
   COITRACE ("COIBufferMap");
 
-  /* Features of liboffload.  */
-  assert (offset == 0);
+  /* Features of liboffloadmic.  */
+  assert (in_Offset == 0);
+  assert (in_NumDependencies == 0);
 
   /* Convert input arguments.  */
-  Buffer *buf = (Buffer *) buffer;
+  Buffer *buf = (Buffer *) in_Buffer;
 
   /* Only BUFFER_NORMAL buffers should come here.  */
   assert (buf->type == BUFFER_NORMAL);
@@ -516,89 +621,102 @@ SYMBOL_VERSION (COIBufferMap, 1) (COIBUFFER buffer,
     COIERROR ("Cannot map shared memory.");
 
   /* Prepare output arguments.  */
-  if (map_instance != 0)
-    *map_instance = (COIMAPINSTANCE) buf;
-  if (data != 0)
-    *data = buf->data;
+  if (out_pMapInstance != 0)
+    *out_pMapInstance = (COIMAPINSTANCE) buf;
+  if (out_ppData != 0)
+    *out_ppData = buf->data;
+
+  if (out_pCompletion)
+    out_pCompletion->opaque[0] = 0;
 
   return COI_SUCCESS;
 }
 
 
 COIRESULT
-SYMBOL_VERSION (COIBufferRead, 1) (COIBUFFER buffer,
-				   uint64_t offset,
-				   void *data,
-				   uint64_t length,
-				   COI_COPY_TYPE type,
-				   uint32_t dependencies_num,     // Ignored
-				   const COIEVENT *dependencies,  // Ignored
-				   COIEVENT *completion)	  // Ignored
+SYMBOL_VERSION (COIBufferRead, 1) (COIBUFFER in_SourceBuffer,
+				   uint64_t in_Offset,
+				   void *in_pDestData,
+				   uint64_t in_Length,
+				   COI_COPY_TYPE in_Type,
+				   uint32_t in_NumDependencies,
+				   const COIEVENT *in_pDependencies,  // Ignored
+				   COIEVENT *out_pCompletion)
 {
   COITRACE ("COIBufferRead");
 
-  /* Convert input arguments.  */
-  Buffer *buf = (Buffer *) buffer;
+  /* Features of liboffloadmic.  */
+  assert (in_pDestData != NULL);
+  assert (in_Type == COI_COPY_UNSPECIFIED);
+  assert (in_NumDependencies == 0);
 
-  /* Features of liboffload.  */
-  assert (type == COI_COPY_UNSPECIFIED);
+  /* Convert input arguments.  */
+  Buffer *buf = (Buffer *) in_SourceBuffer;
 
-  /* Start critical section.  */
-  if (pthread_mutex_lock (&mutex) != 0)
-    COIERROR ("Cannot lock mutex.");
+  start_critical_section ();
 
   /* Map buffers if needed.  */
   if (buf->data == 0 && buf->type == BUFFER_NORMAL)
-    if (COIBufferMap (buffer, 0, buf->size, (COI_MAP_TYPE) 0,
-		      0, 0, 0, 0, 0) == COI_ERROR)
+    if (COIBufferMap (in_SourceBuffer, 0, buf->size, (COI_MAP_TYPE) 0, 0, 0, 0,
+		      0, 0) == COI_ERROR)
       return COI_ERROR;
 
   /* Copy data.  */
-  memcpy (data, (void *) ((uintptr_t) buf->data+offset), length);
+  memcpy (in_pDestData, (void *) ((uintptr_t) buf->data + in_Offset),
+	  in_Length);
 
   /* Unmap buffers if needed.  */
   if (buf->type == BUFFER_NORMAL)
     if (COIBufferUnmap ((COIMAPINSTANCE) buf, 0, 0, 0) == COI_ERROR)
       return COI_ERROR;
 
-  /* Finish critical section.  */
-  if (pthread_mutex_unlock (&mutex) != 0)
-    COIERROR ("Cannot unlock mutex.");
+  finish_critical_section ();
+
+  if (out_pCompletion)
+    out_pCompletion->opaque[0] = 0;
 
   return COI_SUCCESS;
 }
 
 
 COIRESULT
-SYMBOL_VERSION (COIBufferSetState, 1) (COIBUFFER buffer,
-				       COIPROCESS process,
-				       COI_BUFFER_STATE state,
-				       COI_BUFFER_MOVE_FLAG flag,
-				       uint32_t dependencies_num,     // Ignored
-				       const COIEVENT *dependencies,  // Ignored
-				       COIEVENT *completion)	      // Ignored
+SYMBOL_VERSION (COIBufferSetState, 1) (COIBUFFER in_Buffer,		  // Ignored
+				       COIPROCESS in_Process,		  // Ignored
+				       COI_BUFFER_STATE in_State,	  // Ignored
+				       COI_BUFFER_MOVE_FLAG in_DataMove,
+				       uint32_t in_NumDependencies,
+				       const COIEVENT *in_pDependencies,  // Ignored
+				       COIEVENT *out_pCompletion)
 {
   COITRACE ("COIBufferSetState");
 
-  /* Features of liboffload.  */
-  assert (flag == COI_BUFFER_NO_MOVE);
+  /* Features of liboffloadmic.  */
+  assert (in_DataMove == COI_BUFFER_NO_MOVE);
+  assert (in_NumDependencies == 0);
 
   /* Looks like we have nothing to do here.  */
 
+  if (out_pCompletion)
+    out_pCompletion->opaque[0] = 0;
+
   return COI_SUCCESS;
 }
 
 
 COIRESULT
-SYMBOL_VERSION (COIBufferUnmap, 1) (COIMAPINSTANCE map_instance,
-				    uint32_t dependencies_num,      // Ignored
-				    const COIEVENT *dependencies,   // Ignored
-				    COIEVENT *completion)	    // Ignored
+SYMBOL_VERSION (COIBufferUnmap, 1) (COIMAPINSTANCE in_MapInstance,
+				    uint32_t in_NumDependencies,
+				    const COIEVENT *in_pDependencies, // Ignored
+				    COIEVENT *out_pCompletion)
 {
   COITRACE ("COIBufferUnmap");
 
+  /* Features of liboffloadmic.  */
+  assert (in_MapInstance != NULL);
+  assert (in_NumDependencies == 0);
+
   /* Convert input arguments.  */
-  Buffer *buffer = (Buffer *) map_instance;
+  Buffer *buffer = (Buffer *) in_MapInstance;
 
   /* Only BUFFER_NORMAL buffers should come here.  */
   assert (buffer->type == BUFFER_NORMAL);
@@ -609,49 +727,55 @@ SYMBOL_VERSION (COIBufferUnmap, 1) (COIMAPINSTANCE map_instance,
 
   buffer->data = 0;
 
+  if (out_pCompletion)
+    out_pCompletion->opaque[0] = 0;
+
   return COI_SUCCESS;
 }
 
 
 COIRESULT
-SYMBOL_VERSION (COIBufferWrite, 1) (COIBUFFER buffer,
-				    uint64_t offset,
-				    const void *data,
-				    uint64_t length,
-				    COI_COPY_TYPE type,
-				    uint32_t dependencies_num,    // Ignored
-				    const COIEVENT *dependencies, // Ignored
-				    COIEVENT *completion)	  // Ignored
+SYMBOL_VERSION (COIBufferWrite, 1) (COIBUFFER in_DestBuffer,
+				    uint64_t in_Offset,
+				    const void *in_pSourceData,
+				    uint64_t in_Length,
+				    COI_COPY_TYPE in_Type,
+				    uint32_t in_NumDependencies,
+				    const COIEVENT *in_pDependencies, // Ignored
+				    COIEVENT *out_pCompletion)
 {
   COITRACE ("COIBufferWrite");
 
+  /* Features of liboffloadmic.  */
+  assert (in_DestBuffer != NULL);
+  assert (in_pSourceData != NULL);
+  assert (in_Type == COI_COPY_UNSPECIFIED);
+  assert (in_NumDependencies == 0);
+
   /* Convert input arguments.  */
-  Buffer *buf = (Buffer *) buffer;
+  Buffer *buf = (Buffer *) in_DestBuffer;
 
-  /* Features of liboffload.  */
-  assert (type == COI_COPY_UNSPECIFIED);
-
-  /* Start critical section.  */
-  if (pthread_mutex_lock (&mutex) != 0)
-    COIERROR ("Cannot lock mutex.");
+  start_critical_section ();
 
   /* Map buffers if needed.  */
   if (buf->data == 0 && buf->type == BUFFER_NORMAL)
-    if (COIBufferMap (buffer, 0, buf->size, (COI_MAP_TYPE) 0,
-		      0, 0, 0, 0, 0) == COI_ERROR)
+    if (COIBufferMap (in_DestBuffer, 0, buf->size, (COI_MAP_TYPE) 0, 0, 0, 0, 0,
+		      0) == COI_ERROR)
       return COI_ERROR;
 
   /* Copy data.  */
-  memcpy ((void *) ((uintptr_t) buf->data+offset), data, length);
+  memcpy ((void *) ((uintptr_t) buf->data + in_Offset), in_pSourceData,
+	  in_Length);
 
   /* Unmap buffers if needed.  */
   if (buf->type == BUFFER_NORMAL)
     if (COIBufferUnmap ((COIMAPINSTANCE) buf, 0, 0, 0) == COI_ERROR)
       return COI_ERROR;
 
-  /* Finish critical section.  */
-  if (pthread_mutex_unlock (&mutex) != 0)
-    COIERROR ("Cannot unlock mutex.");
+  finish_critical_section ();
+
+  if (out_pCompletion)
+    out_pCompletion->opaque[0] = 0;
 
   return COI_SUCCESS;
 }
@@ -663,8 +787,9 @@ SYMBOL_VERSION (COIEngineGetCount, 1) (COI_ISA_TYPE isa,
 {
   COITRACE ("COIEngineGetCount");
 
-  /* Features of liboffload.  */
+  /* Features of liboffloadmic.  */
   assert (isa == COI_ISA_MIC);
+  assert (count != NULL);
 
   /* Prepare output arguments.  */
   *count = num_engines;
@@ -674,186 +799,397 @@ SYMBOL_VERSION (COIEngineGetCount, 1) (COI_ISA_TYPE isa,
 
 
 COIRESULT
-SYMBOL_VERSION (COIEngineGetHandle, 1) (COI_ISA_TYPE isa,
-					uint32_t index,
-					COIENGINE *handle)
+SYMBOL_VERSION (COIEngineGetHandle, 1) (COI_ISA_TYPE in_ISA,
+					uint32_t in_EngineIndex,
+					COIENGINE *out_pEngineHandle)
 {
   COITRACE ("COIEngineGetHandle");
 
-  Engine *engine;
-
-  /* Features of liboffload.  */
-  assert (isa == COI_ISA_MIC);
+  /* Features of liboffloadmic.  */
+  assert (in_ISA == COI_ISA_MIC);
+  assert (out_pEngineHandle != NULL);
 
   /* Check engine index.  */
-  if (index >= num_engines)
+  if (in_EngineIndex >= num_engines)
     COIERROR ("Wrong engine index.");
 
   /* Create engine handle.  */
-  MALLOC (Engine *, engine, sizeof (Engine));
+  Engine *engine = new Engine;
   engine->dir = NULL;
-  engine->index = index;
-  engine->type = isa;
+  engine->index = in_EngineIndex;
+  engine->type = in_ISA;
 
   /* Prepare output argument.  */
-  *handle = (COIENGINE) engine;
+  *out_pEngineHandle = (COIENGINE) engine;
 
   return COI_SUCCESS;
 }
 
 
 COIRESULT
-SYMBOL_VERSION (COIEventWait, 1) (uint16_t events_num,    // Ignored
-				  const COIEVENT *events, // Ignored
-				  int32_t timeout,	  // Ignored
-				  uint8_t wait_all,
-				  uint32_t *signaled_num,
-				  uint32_t *signaled_indices)
+SYMBOL_VERSION (COIEventWait, 1) (uint16_t in_NumEvents,
+				  const COIEVENT *in_pEvents,
+				  int32_t in_TimeoutMilliseconds,
+				  uint8_t in_WaitForAll,
+				  uint32_t *out_pNumSignaled,
+				  uint32_t *out_pSignaledIndices)
 {
   COITRACE ("COIEventWait");
 
-  /* Features of liboffload.  */
-  assert (wait_all == 1);
-  assert (signaled_num == 0);
-  assert (signaled_indices == 0);
+  /* Features of liboffloadmic.  */
+  assert (in_pEvents != NULL);
+  assert (in_TimeoutMilliseconds == 0 || in_TimeoutMilliseconds == -1);
+  assert (in_WaitForAll == 1);
+  assert (out_pNumSignaled == NULL);
+  assert (out_pSignaledIndices == NULL);
 
-  /* Looks like we have nothing to do here.  */
+  if (in_TimeoutMilliseconds == 0)
+    {
+      /* If some event is not signalled, return timeout error.  */
+      for (uint16_t i = 0; i < in_NumEvents; i++)
+	if (non_signalled_events.count (in_pEvents[i].opaque[0]) > 0)
+	  return COI_TIME_OUT_REACHED;
+	else
+	  {
+	    /* If the event signalled with an error, return that error.  */
+	    start_critical_section ();
+	    COIRESULT res = get_event_result (in_pEvents[i]);
+	    finish_critical_section ();
+	    if (res != COI_SUCCESS)
+	      return res;
+	  }
+    }
+  else
+    {
+      /* Wait indefinitely for all events.  */
+      for (uint16_t i = 0; i < in_NumEvents; i++)
+	{
+	  while (non_signalled_events.count (in_pEvents[i].opaque[0]) > 0)
+	    usleep (1000);
+
+	  /* If the event signalled with an error, return that error.  */
+	  start_critical_section ();
+	  COIRESULT res = get_event_result (in_pEvents[i]);
+	  finish_critical_section ();
+	  if (res != COI_SUCCESS)
+	    return res;
+	}
+    }
 
   return COI_SUCCESS;
 }
 
 
 COIRESULT
-SYMBOL_VERSION (COIPipelineCreate, 1) (COIPROCESS process,
-				       COI_CPU_MASK mask,
-				       uint32_t stack_size,       // Ignored
-				       COIPIPELINE *pipeline)
+SYMBOL_VERSION (COIEventRegisterCallback, 1) (const COIEVENT in_Event,
+					      COI_EVENT_CALLBACK in_Callback,
+					      const void *in_UserData,
+					      const uint64_t in_Flags)
 {
-  COITRACE ("COIPipelineCreate");
+  COITRACE ("COIEventRegisterCallback");
 
-  /* Features of liboffload.  */
-  assert (mask == 0);
+  /* Features of liboffloadmic.  */
+  assert (in_Callback != NULL);
+  assert (in_UserData != NULL);
+  assert (in_Flags == 0);
 
-  /* Prepare output arguments.  */
-  *pipeline = (COIPIPELINE) ((Process *) process)->pipeline;
+  start_critical_section ();
+  if (non_signalled_events.count (in_Event.opaque[0]) == 0)
+    {
+      /* If the event is already signalled, invoke the callback immediately.  */
+      COIRESULT res = get_event_result (in_Event);
+      in_Callback (in_Event, res, in_UserData);
+    }
+  else
+    {
+      Callback callback;
+      callback.ptr = in_Callback;
+      callback.data = in_UserData;
+      callbacks.insert (std::pair <uint64_t, Callback> (in_Event.opaque[0],
+							callback));
+    }
+  finish_critical_section ();
 
   return COI_SUCCESS;
 }
 
 
+/* The start routine for the COI pipeline thread.  */
+
+static void *
+pipeline_thread_routine (void *in_Pipeline)
+{
+  /* Convert input arguments.  */
+  Pipeline *pipeline = (Pipeline *) in_Pipeline;
+
+  /* Open pipes.  */
+  pipeline->pipe_host2tgt
+    = open (pipeline->pipe_host2tgt_path, O_CLOEXEC | O_WRONLY);
+  if (pipeline->pipe_host2tgt < 0)
+    COIERRORN ("Cannot open host-to-target pipe.");
+  pipeline->pipe_tgt2host
+    = open (pipeline->pipe_tgt2host_path, O_CLOEXEC | O_RDONLY);
+  if (pipeline->pipe_tgt2host < 0)
+    COIERRORN ("Cannot open target-to-host pipe.");
+
+  free (pipeline->pipe_host2tgt_path);
+  free (pipeline->pipe_tgt2host_path);
+  pipeline->pipe_host2tgt_path = NULL;
+  pipeline->pipe_tgt2host_path = NULL;
+
+  while (!pipeline->destroy)
+    if (pipeline->queue.empty ())
+      usleep (1000);
+    else
+      {
+	Function func = pipeline->queue.front ();
+	start_critical_section ();
+	pipeline->queue.pop ();
+	finish_critical_section ();
+
+	/* Send data to target.  */
+	cmd_t cmd = CMD_PIPELINE_RUN_FUNCTION;
+	WRITEN (pipeline->pipe_host2tgt, &cmd, sizeof (cmd_t));
+	WRITEN (pipeline->pipe_host2tgt, &func.ptr, sizeof (void *));
+	WRITEN (pipeline->pipe_host2tgt, &func.num_buffers, sizeof (uint32_t));
+	for (uint32_t i = 0; i < func.num_buffers; i++)
+	  {
+	    WRITEN (pipeline->pipe_host2tgt, &func.bufs_size[i],
+		    sizeof (uint64_t));
+	    WRITEN (pipeline->pipe_host2tgt, &func.bufs_data_target[i],
+		    sizeof (void *));
+	  }
+	WRITEN (pipeline->pipe_host2tgt, &func.misc_data_len,
+		sizeof (uint16_t));
+	if (func.misc_data_len > 0)
+	  WRITEN (pipeline->pipe_host2tgt, func.misc_data, func.misc_data_len);
+	WRITEN (pipeline->pipe_host2tgt, &func.return_value_len,
+		sizeof (uint16_t));
+
+	delete [] func.bufs_size;
+	delete [] func.bufs_data_target;
+
+	/* Receive data from target.  Wait for target function to complete,
+	   whether it has any data to return or not.  */
+	bool has_return_value = func.return_value_len > 0;
+	int ret_len
+	  = read (pipeline->pipe_tgt2host,
+		  has_return_value ? func.return_value : &cmd,
+		  has_return_value ? func.return_value_len : sizeof (cmd_t));
+	if (ret_len == 0)
+	  {
+	    start_critical_section ();
+	    signal_event (func.completion_event, COI_PROCESS_DIED);
+	    pipeline->is_destroyed = true;
+	    finish_critical_section ();
+	    return NULL;
+	  }
+	else if (ret_len != (has_return_value ? func.return_value_len
+					      : sizeof (cmd_t)))
+	  COIERRORN ("Cannot read from pipe.");
+
+	start_critical_section ();
+	signal_event (func.completion_event, COI_SUCCESS);
+	finish_critical_section ();
+      }
+
+  /* Send data to target.  */
+  const cmd_t cmd = CMD_PIPELINE_DESTROY;
+  WRITEN (pipeline->pipe_host2tgt, &cmd, sizeof (cmd_t));
+
+  /* Close pipes.  */
+  if (close (pipeline->pipe_host2tgt) < 0)
+    COIERRORN ("Cannot close host-to-target pipe.");
+  if (close (pipeline->pipe_tgt2host) < 0)
+    COIERRORN ("Cannot close target-to-host pipe.");
+
+  start_critical_section ();
+  pipeline->is_destroyed = true;
+  finish_critical_section ();
+  return NULL;
+}
+
+
 COIRESULT
-SYMBOL_VERSION (COIPipelineDestroy, 1) (COIPIPELINE pipeline)
+SYMBOL_VERSION (COIPipelineCreate, 1) (COIPROCESS in_Process,
+				       COI_CPU_MASK in_Mask,
+				       uint32_t in_StackSize,	    // Ignored
+				       COIPIPELINE *out_pPipeline)
 {
-  COITRACE ("COIPipelineDestroy");
+  COITRACE ("COIPipelineCreate");
+
+  /* Features of liboffloadmic.  */
+  assert (in_Process != NULL);
+  assert (in_Mask == 0);
+  assert (out_pPipeline != NULL);
+
+  /* Convert input arguments.  */
+  Process *proc = (Process *) in_Process;
+
+  start_critical_section ();
+
+  /* Create pipeline handle.  */
+  Pipeline *pipeline = new Pipeline;
+  pipeline->destroy = false;
+  pipeline->is_destroyed = false;
+  pipeline->process = proc;
+  pipelines.insert (pipeline);
+
+  /* Create pipes.  */
+  uint32_t pipeline_num = max_pipeline_num++;
+  char *eng_dir = pipeline->process->engine->dir;
+  MALLOC (char *, pipeline->pipe_host2tgt_path,
+	  strlen (eng_dir) + sizeof (PIPE_HOST2TGT_NAME "0000000000"));
+  MALLOC (char *, pipeline->pipe_tgt2host_path,
+	  strlen (eng_dir) + sizeof (PIPE_TGT2HOST_NAME "0000000000"));
+  sprintf (pipeline->pipe_host2tgt_path, "%s" PIPE_HOST2TGT_NAME "%010d",
+	   eng_dir, pipeline_num);
+  sprintf (pipeline->pipe_tgt2host_path, "%s" PIPE_TGT2HOST_NAME "%010d",
+	   eng_dir, pipeline_num);
+  if (mkfifo (pipeline->pipe_host2tgt_path, S_IRUSR | S_IWUSR) < 0)
+    COIERROR ("Cannot create pipe %s.", pipeline->pipe_host2tgt_path);
+  if (mkfifo (pipeline->pipe_tgt2host_path, S_IRUSR | S_IWUSR) < 0)
+    COIERROR ("Cannot create pipe %s.", pipeline->pipe_tgt2host_path);
 
-  /* Do nothing here. Pipeline will be closed during COIProcessDestroy.  */
+  /* Send data to target.  */
+  const cmd_t cmd = CMD_PIPELINE_CREATE;
+  WRITE (proc->pipe_host2tgt, &cmd, sizeof (cmd_t));
+  WRITE (proc->pipe_host2tgt, &pipeline_num, sizeof (pipeline_num));
+
+  /* Create a new thread for the pipeline.  */
+  if (pthread_create (&pipeline->thread, NULL, pipeline_thread_routine,
+		      pipeline))
+    COIERROR ("Cannot create new thread.");
+
+  finish_critical_section ();
+
+  /* Prepare output arguments.  */
+  *out_pPipeline = (COIPIPELINE) pipeline;
 
   return COI_SUCCESS;
 }
 
 
 COIRESULT
-SYMBOL_VERSION (COIPipelineRunFunction, 1) (COIPIPELINE pipeline,
-					    COIFUNCTION function,
-					    uint32_t buffers_num,
-					    const COIBUFFER *buffers,
-					    const COI_ACCESS_FLAGS *access_flags, // Ignored
-					    uint32_t dependencies_num,		  // Ignored
-					    const COIEVENT *dependencies,	  // Ignored
-					    const void *misc_data,
-					    uint16_t misc_data_len,
-					    void *return_data,
-					    uint16_t return_data_len,
-					    COIEVENT *completion)		  // Ignored
+SYMBOL_VERSION (COIPipelineDestroy, 1) (COIPIPELINE in_Pipeline)
 {
-  COITRACE ("COIPipelineRunFunction");
+  COITRACE ("COIPipelineDestroy");
 
-  cmd_t cmd = CMD_RUN_FUNCTION;
-  int ret_len;
-  uint32_t i;
-  uint64_t size;
-  void *ptr;
+  assert (in_Pipeline != NULL);
 
   /* Convert input arguments.  */
-  Buffer **bufs = (Buffer **) buffers;
-  Function *func = (Function *) function;
-  Pipeline *pipe = (Pipeline *) pipeline;
+  Pipeline *pipeline = (Pipeline *) in_Pipeline;
 
-  /* Start critical section.  */
-  if (pthread_mutex_lock (&mutex) != 0)
-    COIERROR ("Cannot lock mutex.");
+  start_critical_section ();
+  /* Remove pipeline from the set of undestroyed pipelines.  */
+  pipelines.erase (pipeline);
 
-  /* Send data to target.  */
-  WRITE (pipe->pipe_target, &cmd, sizeof (cmd_t));
-  WRITE (pipe->pipe_target, &(func->ptr), sizeof (void *));
-  WRITE (pipe->pipe_target, &buffers_num, sizeof (uint32_t));
-  for (i = 0; i < buffers_num; i++)
+  /* Exit pipeline thread.  */
+  pipeline->destroy = true;
+  finish_critical_section ();
+
+  while (!pipeline_is_destroyed (pipeline))
+    usleep (1000);
+
+  /* Join with a destroyed thread.  */
+  if (pthread_join (pipeline->thread, NULL))
+    COIERROR ("Cannot join with a thread.");
+
+  delete pipeline;
+
+  return COI_SUCCESS;
+}
+
+
+COIRESULT
+SYMBOL_VERSION (COIPipelineRunFunction, 1) (COIPIPELINE in_Pipeline,
+					    COIFUNCTION in_Function,
+					    uint32_t in_NumBuffers,
+					    const COIBUFFER *in_Buffers,
+					    const COI_ACCESS_FLAGS *in_pBufferAccessFlags, // Ignored
+					    uint32_t in_NumDependencies,
+					    const COIEVENT *in_pDependencies,		   // Ignored
+					    const void *in_pMiscData,
+					    uint16_t in_MiscDataLen,
+					    void *out_pAsyncReturnValue,
+					    uint16_t in_AsyncReturnValueLen,
+					    COIEVENT *out_pCompletion)
+{
+  COITRACE ("COIPipelineRunFunction");
+
+  /* Features of liboffloadmic.  */
+  assert (in_Pipeline != NULL);
+  assert (in_Function != NULL);
+  assert (in_NumDependencies == 0);
+
+  Function func;
+  func.ptr = (void *) in_Function;
+  func.num_buffers = in_NumBuffers;
+  func.bufs_size = new uint64_t [in_NumBuffers];
+  func.bufs_data_target = new void * [in_NumBuffers];
+  for (uint32_t i = 0; i < in_NumBuffers; i++)
     {
-      WRITE (pipe->pipe_target, &(bufs[i]->size), sizeof (uint64_t));
-      WRITE (pipe->pipe_target, &(bufs[i]->data_target), sizeof (void *));
+      Buffer **bufs = (Buffer **) in_Buffers;
+      func.bufs_size[i] = bufs[i]->size;
+      func.bufs_data_target[i] = bufs[i]->data_target;
     }
-  WRITE (pipe->pipe_target, &misc_data_len, sizeof (uint16_t));
-  if (misc_data_len > 0)
-    WRITE (pipe->pipe_target, misc_data, misc_data_len);
-  WRITE (pipe->pipe_target, &return_data_len, sizeof (uint16_t));
-
-  /* Receive data from target.  In emulator we don't need any asynchronous data
-     transfer, so we wait for target process whether it has any data or not.  */
-  ret_len = read (pipe->pipe_host, return_data_len > 0 ? return_data : &cmd,
-	return_data_len > 0 ? return_data_len : sizeof (cmd_t));
-  if (ret_len == 0)
-    return COI_PROCESS_DIED;
-  else if (ret_len != (return_data_len > 0 ? return_data_len : sizeof (cmd_t)))
-    COIERROR ("Cannot read from pipe.");
-
-  /* Finish critical section.  */
-  if (pthread_mutex_unlock (&mutex) != 0)
-    COIERROR ("Cannot unlock mutex.");
+  func.misc_data = (void *) in_pMiscData;
+  func.misc_data_len = in_MiscDataLen;
+  func.return_value = out_pAsyncReturnValue;
+  func.return_value_len = in_AsyncReturnValueLen;
+
+  start_critical_section ();
+  func.completion_event.opaque[0] = max_event_num++;
+  non_signalled_events.insert (func.completion_event.opaque[0]);
+  ((Pipeline *) in_Pipeline)->queue.push (func);
+  finish_critical_section ();
+
+  /* In case of synchronous execution we have to wait for target.  */
+  if (out_pCompletion == NULL)
+    COIEventWait (1, &func.completion_event, -1, 1, NULL, NULL);
+  else
+    *out_pCompletion = func.completion_event;
 
   return COI_SUCCESS;
 }
 
 
 COIRESULT
-SYMBOL_VERSION (COIProcessCreateFromMemory, 1) (COIENGINE engine,
-						const char *bin_name,
-						const void *bin_buffer,
-						uint64_t bin_buffer_len,
-						int argc,
-						const char **argv,
-						uint8_t inherit_env,
-						const char **additional_env,
-						uint8_t proxy_active,		  // Ignored
-						const char *proxyfs_root,	  // Ignored
-						uint64_t buffer_space,		  // Ignored
-						const char *lib_search_path,
-						const char *file_of_origin,       // Ignored
-						uint64_t file_of_origin_offset,   // Ignored
-						COIPROCESS *process)
+SYMBOL_VERSION (COIProcessCreateFromMemory, 1) (COIENGINE in_Engine,
+						const char *in_pBinaryName,
+						const void *in_pBinaryBuffer,
+						uint64_t in_BinaryBufferLength,
+						int in_Argc,
+						const char **in_ppArgv,
+						uint8_t in_DupEnv,
+						const char **in_ppAdditionalEnv,
+						uint8_t in_ProxyActive,		// Ignored
+						const char *in_Reserved,	// Ignored
+						uint64_t in_InitialBufferSpace,	// Ignored
+						const char *in_LibrarySearchPath,
+						const char *in_FileOfOrigin,    // Ignored
+						uint64_t in_FileOfOriginOffset,	// Ignored
+						COIPROCESS *out_pProcess)
 {
   COITRACE ("COIProcessCreateFromMemory");
 
   const int run_max_args_num = 128;
-  char **envp;
   char *run_argv[run_max_args_num];
   char *emul_run = getenv (OFFLOAD_EMUL_RUN_ENV);
-  char *env_name, *tok;
-  char *pipe_host_path, *pipe_target_path, *pipes_path, *target_exe;
-  FILE *file;
-  int fd;
-  int i, j, env_i, env_num;
-  int pipe_host, pipe_target;
   const int uint_max_len = 11;
-  pid_t pid;
-  Pipeline *pipeline;
-  Process *proc;
 
-  /* Features of liboffload.  */
-  assert (argc == 0);
-  assert (argv == 0);
+  /* Features of liboffloadmic.  */
+  assert (in_Engine != NULL);
+  assert (in_pBinaryName != NULL);
+  assert (in_pBinaryBuffer != NULL);
+  assert (in_Argc == 0);
+  assert (in_ppArgv == NULL);
+  assert (in_ppAdditionalEnv == NULL);
+  assert (in_LibrarySearchPath != NULL);
+  assert (out_pProcess != NULL);
 
   /* Convert input arguments.  */
-  Engine *eng = (Engine *) engine;
+  Engine *eng = (Engine *) in_Engine;
 
   /* Create temporary directory for engine files.  */
   assert (eng->dir == NULL);
@@ -869,15 +1205,17 @@ SYMBOL_VERSION (COIProcessCreateFromMemory, 1) (COIENGINE engine,
   STRDUP (tmp_dirs[tmp_dirs_num - 1], eng->dir);
 
   /* Create target executable file.  */
-  MALLOC (char *, target_exe, strlen (eng->dir) + strlen (bin_name) + 2);
-  sprintf (target_exe, "%s/%s", eng->dir, bin_name);
-  fd = open (target_exe, O_CLOEXEC | O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR);
+  char *target_exe;
+  MALLOC (char *, target_exe, strlen (eng->dir) + strlen (in_pBinaryName) + 2);
+  sprintf (target_exe, "%s/%s", eng->dir, in_pBinaryName);
+  int fd = open (target_exe, O_CLOEXEC | O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR);
   if (fd < 0)
     COIERROR ("Cannot create file %s.", target_exe);
-  file = fdopen (fd, "wb");
+  FILE *file = fdopen (fd, "wb");
   if (file == NULL)
     COIERROR ("Cannot associate stream with file descriptor.");
-  if (fwrite (bin_buffer, 1, bin_buffer_len, file) != bin_buffer_len)
+  if (fwrite (in_pBinaryBuffer, 1, in_BinaryBufferLength, file)
+      != in_BinaryBufferLength)
     COIERROR ("Cannot write in file %s.", target_exe);
   if (fclose (file) != 0)
     COIERROR ("Cannot close file %s.", target_exe);
@@ -887,24 +1225,24 @@ SYMBOL_VERSION (COIProcessCreateFromMemory, 1) (COIENGINE engine,
     COIERROR ("Cannot change permissions for file %s.", target_exe);
 
   /* Create directory for pipes to prevent names collision.  */
-  MALLOC (char *, pipes_path, strlen (PIPES_PATH) + strlen (eng->dir) + 1);
+  char *pipes_path;
+  MALLOC (char *, pipes_path, strlen (eng->dir) + sizeof (PIPES_PATH));
   sprintf (pipes_path, "%s" PIPES_PATH, eng->dir);
   if (mkdir (pipes_path, S_IRWXU) < 0)
     COIERROR ("Cannot create folder %s.", pipes_path);
 
-  /* Create pipes.  */
-  MALLOC (char *, pipe_host_path,
-	  strlen (PIPE_HOST_PATH) + strlen (eng->dir) + 1);
-  MALLOC (char *, pipe_target_path,
-	  strlen (PIPE_TARGET_PATH) + strlen (eng->dir) + 1);
-  if (pipe_target_path == NULL)
-    COIERROR ("Cannot allocate memory.");
-  sprintf (pipe_host_path, "%s" PIPE_HOST_PATH, eng->dir);
-  sprintf (pipe_target_path, "%s" PIPE_TARGET_PATH, eng->dir);
-  if (mkfifo (pipe_host_path, S_IRUSR | S_IWUSR) < 0)
-    COIERROR ("Cannot create pipe %s.", pipe_host_path);
-  if (mkfifo (pipe_target_path, S_IRUSR | S_IWUSR) < 0)
-    COIERROR ("Cannot create pipe %s.", pipe_target_path);
+  /* Create 2 main pipes for inter-process communication.  */
+  char *pipe_host2tgt_path, *pipe_tgt2host_path;
+  MALLOC (char *, pipe_host2tgt_path,
+	  strlen (eng->dir) + sizeof (PIPE_HOST2TGT_NAME "mainpipe"));
+  MALLOC (char *, pipe_tgt2host_path,
+	  strlen (eng->dir) + sizeof (PIPE_TGT2HOST_NAME "mainpipe"));
+  sprintf (pipe_host2tgt_path, "%s" PIPE_HOST2TGT_NAME "mainpipe", eng->dir);
+  sprintf (pipe_tgt2host_path, "%s" PIPE_TGT2HOST_NAME "mainpipe", eng->dir);
+  if (mkfifo (pipe_host2tgt_path, S_IRUSR | S_IWUSR) < 0)
+    COIERROR ("Cannot create main pipe %s.", pipe_host2tgt_path);
+  if (mkfifo (pipe_tgt2host_path, S_IRUSR | S_IWUSR) < 0)
+    COIERROR ("Cannot create main pipe %s.", pipe_tgt2host_path);
 
   /* Prepare argv.  */
   if (emul_run == NULL || strcmp (emul_run, "") == 0)
@@ -915,9 +1253,9 @@ SYMBOL_VERSION (COIProcessCreateFromMemory, 1) (COIENGINE engine,
   else
     {
       char *ptr, *tmp;
-      i = 0;
+      int i = 0;
       STRDUP (tmp, emul_run);
-      tok = strtok_r (tmp, " ", &ptr);
+      char *tok = strtok_r (tmp, " ", &ptr);
       while (tok != NULL)
 	{
 	  if (i >= run_max_args_num)
@@ -926,25 +1264,25 @@ SYMBOL_VERSION (COIProcessCreateFromMemory, 1) (COIENGINE engine,
 	  tok = strtok_r (NULL, " ", &ptr);
 	}
       STRDUP (run_argv[i], target_exe);
-      run_argv[i+1] = (char *) NULL;
+      run_argv[i + 1] = (char *) NULL;
       free (tmp);
     }
 
   /* Prepare envp.  */
-  /* FIXME: take into account additional_env.  */
-  assert (additional_env == NULL);
-
-  env_num = 0;
-  if (inherit_env == true)
+  int env_num = 0;
+  if (in_DupEnv == true)
     while (environ[env_num++]);
   env_num += 4; // LD_LIBRARY_PATH, MIC_DIR, MIC_INDEX, NULL
 
+  char **envp;
   MALLOC (char **, envp, env_num * sizeof (char *));
 
-  env_i = 0;
-  if (inherit_env == true)
-    for (i = 0; environ[i] != NULL; i++)
+  int env_i = 0;
+  if (in_DupEnv == true)
+    for (unsigned i = 0; environ[i] != NULL; i++)
       {
+	unsigned j;
+	char *env_name;
 	STRDUP (env_name, environ[i]);
 	for (j = 0; env_name[j] != '=' && env_name[j] != '\0'; j++);
 	env_name[j] = '\0';
@@ -958,17 +1296,17 @@ SYMBOL_VERSION (COIProcessCreateFromMemory, 1) (COIENGINE engine,
   MALLOC (char *, envp[env_i], strlen (MIC_DIR_ENV) + strlen (eng->dir) + 2);
   sprintf (envp[env_i], "%s=%s", MIC_DIR_ENV, eng->dir);
 
-  MALLOC (char *, envp[env_i+1], strlen (MIC_INDEX_ENV) + uint_max_len + 1);
-  sprintf (envp[env_i+1], "%s=%u", MIC_INDEX_ENV, eng->index);
+  MALLOC (char *, envp[env_i + 1], strlen (MIC_INDEX_ENV) + uint_max_len + 1);
+  sprintf (envp[env_i + 1], "%s=%u", MIC_INDEX_ENV, eng->index);
 
-  MALLOC (char *, envp[env_i+2],
-	  strlen ("LD_LIBRARY_PATH=") + strlen (lib_search_path) + 1);
-  sprintf (envp[env_i+2], "LD_LIBRARY_PATH=%s", lib_search_path);
+  MALLOC (char *, envp[env_i + 2],
+	  strlen ("LD_LIBRARY_PATH=") + strlen (in_LibrarySearchPath) + 1);
+  sprintf (envp[env_i + 2], "LD_LIBRARY_PATH=%s", in_LibrarySearchPath);
 
-  envp[env_i+3] = (char *) NULL;
+  envp[env_i + 3] = (char *) NULL;
 
   /* Create target process.  */
-  pid = vfork ();
+  pid_t pid = vfork ();
   if (pid < 0)
     COIERROR ("Cannot create child process.");
 
@@ -979,37 +1317,33 @@ SYMBOL_VERSION (COIProcessCreateFromMemory, 1) (COIENGINE engine,
 	COIERROR ("Cannot execute file %s.", target_exe);
     }
 
-  /* Open pipes.  */
-  pipe_host = open (pipe_host_path, O_CLOEXEC | O_RDONLY);
-  if (pipe_host < 0)
-    COIERROR ("Cannot open target-to-host pipe.");
-  pipe_target = open (pipe_target_path, O_CLOEXEC | O_WRONLY);
-  if (pipe_target < 0)
-    COIERROR ("Cannot open host-to-target pipe.");
-
-  /* Create pipeline handle.  */
-  MALLOC (Pipeline *, pipeline, sizeof (Pipeline));
-  pipeline->pipe_host = pipe_host;
-  pipeline->pipe_target = pipe_target;
+  /* Open main pipes.  */
+  int pipe_host2tgt = open (pipe_host2tgt_path, O_CLOEXEC | O_WRONLY);
+  if (pipe_host2tgt < 0)
+    COIERROR ("Cannot open host-to-target main pipe.");
+  int pipe_tgt2host = open (pipe_tgt2host_path, O_CLOEXEC | O_RDONLY);
+  if (pipe_tgt2host < 0)
+    COIERROR ("Cannot open target-to-host main pipe.");
 
   /* Create process handle.  */
-  MALLOC (Process *, proc, sizeof (Process));
+  Process *proc = new Process;
   proc->pid = pid;
+  proc->pipe_host2tgt = pipe_host2tgt;
+  proc->pipe_tgt2host = pipe_tgt2host;
   proc->engine = eng;
-  proc->functions = 0;
-  proc->pipeline = pipeline;
+  proc->functions = NULL;
 
   /* Prepare output arguments.  */
-  *process = (COIPROCESS) proc;
+  *out_pProcess = (COIPROCESS) proc;
 
   /* Clean up.  */
-  for (i = 0; run_argv[i] != NULL; i++)
+  for (unsigned i = 0; run_argv[i] != NULL; i++)
     free (run_argv[i]);
-  for (i = 0; envp[i] != NULL; i++)
+  for (unsigned i = 0; envp[i] != NULL; i++)
     free (envp[i]);
   free (envp);
-  free (pipe_host_path);
-  free (pipe_target_path);
+  free (pipe_host2tgt_path);
+  free (pipe_tgt2host_path);
   free (pipes_path);
   free (target_exe);
 
@@ -1039,109 +1373,101 @@ SYMBOL_VERSION (COIProcessCreateFromFile, 1) (COIENGINE in_Engine,
 
 
 COIRESULT
-SYMBOL_VERSION (COIProcessDestroy, 1) (COIPROCESS process,
-				       int32_t wait_timeout,      // Ignored
-				       uint8_t force,
-				       int8_t *proc_return,
-				       uint32_t *reason)
+SYMBOL_VERSION (COIProcessDestroy, 1) (COIPROCESS in_Process,
+				       int32_t in_WaitForMainTimeout, // Ignored
+				       uint8_t in_ForceDestroy,
+				       int8_t *out_pProcessReturn,
+				       uint32_t *out_pTerminationCode)
 {
   COITRACE ("COIProcessDestroy");
 
-  int i;
+  assert (in_Process != NULL);
+  assert (out_pProcessReturn != NULL);
+  assert (out_pTerminationCode != NULL);
 
   /* Convert input arguments.  */
-  Process *proc = (Process *) process;
+  Process *proc = (Process *) in_Process;
 
-  /* Close pipeline.  */
-  if (close (proc->pipeline->pipe_host) < 0)
-    COIERROR ("Cannot close target-to-host pipe.");
-  if (close (proc->pipeline->pipe_target) < 0)
-    COIERROR ("Cannot close host-to-target pipe.");
-  free (proc->pipeline);
+  /* Destroy all undestroyed pipelines.  */
+  while (!pipelines.empty ())
+    {
+      std::set<Pipeline *>::iterator p = pipelines.begin ();
+      COIPipelineDestroy ((COIPIPELINE) *p);
+    }
+
+  /* Close main pipes.  */
+  if (close (proc->pipe_host2tgt) < 0)
+    COIERROR ("Cannot close host-to-target main pipe.");
+  if (close (proc->pipe_tgt2host) < 0)
+    COIERROR ("Cannot close target-to-host main pipe.");
 
   /* Shutdown target process by force.  */
-  if (force)
+  if (in_ForceDestroy)
     kill (proc->pid, SIGTERM);
 
   /* Clean up.  */
-  for (i = 0; proc->functions[i] != 0; i++)
-    {
-      free (proc->functions[i]->name);
-      free (proc->functions[i]);
-    }
   free (proc->engine->dir);
-  free (proc->engine);
   free (proc->functions);
-  free (proc);
+  delete proc->engine;
+  delete proc;
 
   /* Prepare output arguments.  */
-  *proc_return = 0;
-  *reason = 0;
+  *out_pProcessReturn = 0;
+  *out_pTerminationCode = 0;
 
   return COI_SUCCESS;
 }
 
 
 COIRESULT
-SYMBOL_VERSION (COIProcessGetFunctionHandles, 1) (COIPROCESS process,
-						  uint32_t functions_num,
-						  const char **function_names,
-						  COIFUNCTION *function_handles)
+SYMBOL_VERSION (COIProcessGetFunctionHandles, 1) (COIPROCESS in_Process,
+						  uint32_t in_NumFunctions,
+						  const char **in_ppFunctionNameArray,
+						  COIFUNCTION *out_pFunctionHandleArray)
 {
   COITRACE ("COIProcessGetFunctionHandles");
 
-  cmd_t cmd = CMD_GET_FUNCTION_HANDLE;
-  Function *function;
-  size_t len;
-  void *ptr;
-  uint32_t i;
+  assert (in_Process != NULL);
+  assert (in_ppFunctionNameArray != NULL);
+  assert (out_pFunctionHandleArray != NULL);
 
   /* Convert input arguments.  */
-  Process *proc = (Process *) process;
+  Process *proc = (Process *) in_Process;
 
   /* This function should be called once for the process.  */
-  assert (proc->functions == 0);
+  assert (proc->functions == NULL);
 
-  /* Create array of function pointers.  Last element is 0, what shows
-     the end of the array.  This array is used to free memory when process
-     is destroyed.  */
-  proc->functions = (Function **) calloc (functions_num + 1,
-					  sizeof (Function *));
+  /* Create array of function pointers.  Last element is 0, what shows the end
+     of the array.  This array is used to free memory when process is
+     destroyed.  */
+  proc->functions = (void **) calloc (in_NumFunctions + 1, sizeof (void *));
   if (proc->functions == NULL)
     COIERROR ("Cannot allocate memory.");
 
   /* Get handles for functions.  */
-  for (i = 0; i < functions_num; i++)
+  for (uint32_t i = 0; i < in_NumFunctions; i++)
     {
-      MALLOC (Function *, function, sizeof (Function));
-
-      len = strlen (function_names[i]) + 1;
+      size_t len = strlen (in_ppFunctionNameArray[i]) + 1;
 
-      /* Start critical section.  */
-      if (pthread_mutex_lock (&mutex) != 0)
-	COIERROR ("Cannot lock mutex.");
+      start_critical_section ();
 
       /* Send data to target.  */
-      WRITE (proc->pipeline->pipe_target, &cmd, sizeof (cmd_t));
-      WRITE (proc->pipeline->pipe_target, &len, sizeof (size_t));
-      WRITE (proc->pipeline->pipe_target, function_names[i], len);
+      const cmd_t cmd = CMD_GET_FUNCTION_HANDLE;
+      WRITE (proc->pipe_host2tgt, &cmd, sizeof (cmd_t));
+      WRITE (proc->pipe_host2tgt, &len, sizeof (size_t));
+      WRITE (proc->pipe_host2tgt, in_ppFunctionNameArray[i], len);
 
-      /* Receive data from  target.  */
-      READ (proc->pipeline->pipe_host, &ptr, sizeof (void *));
+      /* Receive data from target.  */
+      void *fn_ptr;
+      READ (proc->pipe_tgt2host, &fn_ptr, sizeof (void *));
 
-      /* Finish critical section.  */
-      if (pthread_mutex_unlock (&mutex) != 0)
-	COIERROR ("Cannot unlock mutex.");
-
-      /* Prepare output arguments.  */
-      STRDUP (function->name, function_names[i]);
-      if (function->name == NULL)
-	COIERROR ("Cannot allocate memory.");
-      function->ptr = ptr;
-      function_handles[i] = (COIFUNCTION) function;
+      finish_critical_section ();
 
       /* Save function pointer.  */
-      proc->functions[i] = function;
+      proc->functions[i] = fn_ptr;
+
+      /* Prepare output arguments.  */
+      out_pFunctionHandleArray[i] = (COIFUNCTION) fn_ptr;
     }
 
   return COI_SUCCESS;
@@ -1161,23 +1487,22 @@ SYMBOL_VERSION (COIProcessLoadLibraryFromMemory, 2) (COIPROCESS in_Process,
 {
   COITRACE ("COIProcessLoadLibraryFromMemory");
 
-  const cmd_t cmd = CMD_OPEN_LIBRARY;
-  char *lib_path;
-  int fd;
-  FILE *file;
-  size_t len;
+  assert (in_Process != NULL);
+  assert (in_pLibraryBuffer != NULL);
+  assert (out_pLibrary != NULL);
 
   /* Convert input arguments.  */
   Process *proc = (Process *) in_Process;
 
   /* Create target library file.  */
-  MALLOC (char *, lib_path,
-	  strlen (proc->engine->dir) + strlen (in_pLibraryName) + 2);
+  char *lib_path;
+  size_t len = strlen (proc->engine->dir) + strlen (in_pLibraryName) + 2;
+  MALLOC (char *, lib_path, len);
   sprintf (lib_path, "%s/%s", proc->engine->dir, in_pLibraryName);
-  fd = open (lib_path, O_CLOEXEC | O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR);
+  int fd = open (lib_path, O_CLOEXEC | O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR);
   if (fd < 0)
     COIERROR ("Cannot create file %s.", lib_path);
-  file = fdopen (fd, "wb");
+  FILE *file = fdopen (fd, "wb");
   if (file == NULL)
     COIERROR ("Cannot associate stream with file descriptor.");
   if (fwrite (in_pLibraryBuffer, 1, in_LibraryBufferLength, file)
@@ -1186,24 +1511,19 @@ SYMBOL_VERSION (COIProcessLoadLibraryFromMemory, 2) (COIPROCESS in_Process,
   if (fclose (file) != 0)
     COIERROR ("Cannot close file %s.", lib_path);
 
-  len = strlen (lib_path) + 1;
-
-  /* Start critical section.  */
-  if (pthread_mutex_lock (&mutex) != 0)
-    COIERROR ("Cannot lock mutex.");
+  start_critical_section ();
 
   /* Make target open library.  */
-  WRITE (proc->pipeline->pipe_target, &cmd, sizeof (cmd_t));
-  WRITE (proc->pipeline->pipe_target, &len, sizeof (size_t));
-  WRITE (proc->pipeline->pipe_target, lib_path, len);
+  const cmd_t cmd = CMD_OPEN_LIBRARY;
+  WRITE (proc->pipe_host2tgt, &cmd, sizeof (cmd_t));
+  WRITE (proc->pipe_host2tgt, &len, sizeof (size_t));
+  WRITE (proc->pipe_host2tgt, lib_path, len);
 
   /* Receive data from target.  */
   void *handle;
-  READ (proc->pipeline->pipe_host, &handle, sizeof (void *));
+  READ (proc->pipe_tgt2host, &handle, sizeof (void *));
 
-  /* Finish critical section.  */
-  if (pthread_mutex_unlock (&mutex) != 0)
-    COIERROR ("Cannot unlock mutex.");
+  finish_critical_section ();
 
   /* Clean up.  */
   free (lib_path);
@@ -1214,11 +1534,11 @@ SYMBOL_VERSION (COIProcessLoadLibraryFromMemory, 2) (COIPROCESS in_Process,
 
 
 COIRESULT
-SYMBOL_VERSION (COIProcessRegisterLibraries, 1) (uint32_t libraries_num,
-						 const void **libraries,
-						 const uint64_t *library_sizes,
-						 const char **files_of_origin,
-						 const uint64_t *file_of_origin_offsets)
+SYMBOL_VERSION (COIProcessRegisterLibraries, 1) (uint32_t in_NumLibraries,		      // Ignored
+						 const void **in_ppLibraryArray,	      // Ignored
+						 const uint64_t *in_pLibrarySizeArray,	      // Ignored
+						 const char **in_ppFileOfOriginArray,	      // Ignored
+						 const uint64_t *in_pFileOfOriginOffSetArray) // Ignored
 {
   COITRACE ("COIProcessRegisterLibraries");
 
@@ -1234,22 +1554,21 @@ SYMBOL_VERSION (COIProcessUnloadLibrary, 1) (COIPROCESS in_Process,
 {
   COITRACE ("COIProcessUnloadLibrary");
 
+  assert (in_Process != NULL);
+  assert (in_Library != NULL);
+
   const cmd_t cmd = CMD_CLOSE_LIBRARY;
 
   /* Convert input arguments.  */
   Process *proc = (Process *) in_Process;
 
-  /* Start critical section.  */
-  if (pthread_mutex_lock (&mutex) != 0)
-    COIERROR ("Cannot lock mutex.");
+  start_critical_section ();
 
   /* Make target close library.  */
-  WRITE (proc->pipeline->pipe_target, &cmd, sizeof (cmd_t));
-  WRITE (proc->pipeline->pipe_target, &in_Library, sizeof (void *));
+  WRITE (proc->pipe_host2tgt, &cmd, sizeof (cmd_t));
+  WRITE (proc->pipe_host2tgt, &in_Library, sizeof (void *));
 
-  /* Finish critical section.  */
-  if (pthread_mutex_unlock (&mutex) != 0)
-    COIERROR ("Cannot unlock mutex.");
+  finish_critical_section ();
 
   return COI_SUCCESS;
 }
@@ -1290,12 +1609,14 @@ SYMBOL_VERSION (COIPipelineSetCPUMask, 1) (COIPROCESS in_Process,
 
 
 COIRESULT
-SYMBOL_VERSION (COIEngineGetInfo, 1) (COIENGINE in_EngineHandle,
-				      uint32_t in_EngineInfoSize,
+SYMBOL_VERSION (COIEngineGetInfo, 1) (COIENGINE in_EngineHandle,  // Ignored
+				      uint32_t in_EngineInfoSize, // Ignored
 				      COI_ENGINE_INFO *out_pEngineInfo)
 {
   COITRACE ("COIEngineGetInfo");
 
+  assert (out_pEngineInfo != NULL);
+
   out_pEngineInfo->ISA = COI_ISA_x86_64;
   out_pEngineInfo->NumCores = 1;
   out_pEngineInfo->NumThreads = 8;
diff --git a/liboffloadmic/runtime/emulator/coi_host.h b/liboffloadmic/runtime/emulator/coi_host.h
index 82260da9db98..38ea274dbe7f 100644
--- a/liboffloadmic/runtime/emulator/coi_host.h
+++ b/liboffloadmic/runtime/emulator/coi_host.h
@@ -41,6 +41,16 @@
   return COI_ERROR;			  \
 }
 
+/* Like COIERROR, but return NULL instead of COIRESULT.  */
+#define COIERRORN(...)			  \
+{					  \
+  fprintf (stderr, "COI ERROR - HOST: "); \
+  fprintf (stderr, __VA_ARGS__);	  \
+  fprintf (stderr, "\n");		  \
+  perror (NULL);			  \
+  return NULL;				  \
+}
+
 #ifdef DEBUG
   #define COITRACE(...)			    \
   {					    \