D: Implement GCC emutls in druntime

* libdruntime/Makefile.am: Add emutls and gthread files.
* libdruntime/Makefile.in: Regenerate.
* libdruntime/gcc/emutls.d: New file. Implement GC-compatible emutls.
* libdruntime/gcc/gthread.d: New file.
* libdruntime/gcc/sections/elf_shared.d: Integrate emutls support.
* testsuite/libphobos.allocations/tls_gc_integration.d: New test for
TLS.

From-SVN: r270568

1 files changed, 50 insertions, 0 deletions

diff --git a/libphobos/testsuite/libphobos.allocations/tls_gc_integration.d b/libphobos/testsuite/libphobos.allocations/tls_gc_integration.d
new file mode 100644
index 00000000000..44eb40c366d
--- /dev/null
+++ b/libphobos/testsuite/libphobos.allocations/tls_gc_integration.d
@@ -0,0 +1,50 @@
+import core.memory, core.thread, core.bitop;
+
+/*
+ * This test repeatedly performs operations on GC-allocated objects which
+ * are only reachable from TLS storage. Tests are performed in multiple threads
+ * and GC collections are triggered repeatedly, so if the GC does not properly
+ * scan TLS memory, this provokes a crash.
+ */
+class TestTLS
+{
+    uint a;
+    void addNumber()
+    {
+        auto val = volatileLoad(&a);
+        val++;
+        volatileStore(&a, val);
+    }
+}
+
+TestTLS tlsPtr;
+
+static this()
+{
+    tlsPtr = new TestTLS();
+}
+
+void main()
+{
+    void runThread()
+    {
+        for (size_t i = 0; i < 100; i++)
+        {
+            Thread.sleep(10.msecs);
+            tlsPtr.addNumber();
+            GC.collect();
+        }
+    }
+
+    Thread[] threads;
+    for (size_t i = 0; i < 20; i++)
+    {
+        auto t = new Thread(&runThread);
+        threads ~= t;
+        t.start();
+    }
+    runThread();
+
+    foreach (thread; threads)
+        thread.join();
+}