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author | Kuba Mracek <mracek@apple.com> | 2017-07-05 22:17:44 +0000 |
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committer | Kuba Mracek <mracek@apple.com> | 2017-07-05 22:17:44 +0000 |
commit | f863c64e6e6ec4b46420bd546dea312c0bb3e2f5 (patch) | |
tree | 8ed16283330773501caa7b1e5ca60eecd2a8cb6a /test/tsan | |
parent | f339952e6e43368ab0f4783bc330a4e5240a4024 (diff) |
[tsan] Use pthread_sigmask instead of sigprocmask to block signals in a thread on Darwin
On Darwin, sigprocmask changes the signal mask for the entire process. This has some unwanted consequences, because e.g. internal_start_thread wants to disable signals only in the current thread (to make the new thread inherit the signal mask), which is currently broken on Darwin. This patch switches to pthread_sigmask.
Differential Revision: https://reviews.llvm.org/D35016
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@307212 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/tsan')
-rw-r--r-- | test/tsan/Darwin/signals-blocked.cc | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/test/tsan/Darwin/signals-blocked.cc b/test/tsan/Darwin/signals-blocked.cc new file mode 100644 index 000000000..209dc2229 --- /dev/null +++ b/test/tsan/Darwin/signals-blocked.cc @@ -0,0 +1,75 @@ +// RUN: %clangxx_tsan %s -o %t && %run %t 2>&1 | FileCheck %s + +#include <pthread.h> +#include <stdio.h> +#include <stdlib.h> +#include <signal.h> +#include <sys/types.h> +#include <sys/time.h> +#include <unistd.h> +#include <errno.h> + +volatile bool signal_delivered; + +static void handler(int sig) { + if (sig == SIGALRM) + signal_delivered = true; +} + +static void* thr(void *p) { + sigset_t sigset; + sigemptyset(&sigset); + sigaddset(&sigset, SIGALRM); + int ret = pthread_sigmask(SIG_UNBLOCK, &sigset, NULL); + if (ret) abort(); + + struct sigaction act = {}; + act.sa_handler = &handler; + if (sigaction(SIGALRM, &act, 0)) { + perror("sigaction"); + exit(1); + } + + itimerval t; + t.it_value.tv_sec = 0; + t.it_value.tv_usec = 10000; + t.it_interval = t.it_value; + if (setitimer(ITIMER_REAL, &t, 0)) { + perror("setitimer"); + exit(1); + } + + while (!signal_delivered) { + usleep(1000); + } + + t.it_value.tv_usec = 0; + if (setitimer(ITIMER_REAL, &t, 0)) { + perror("setitimer"); + exit(1); + } + + fprintf(stderr, "SIGNAL DELIVERED\n"); + + return 0; +} + +int main() { + sigset_t sigset; + sigemptyset(&sigset); + sigaddset(&sigset, SIGALRM); + int ret = pthread_sigmask(SIG_BLOCK, &sigset, NULL); + if (ret) abort(); + + pthread_t th; + pthread_create(&th, 0, thr, 0); + pthread_join(th, 0); + + fprintf(stderr, "DONE\n"); + return 0; +} + +// CHECK-NOT: WARNING: ThreadSanitizer: +// CHECK: SIGNAL DELIVERED +// CHECK: DONE +// CHECK-NOT: WARNING: ThreadSanitizer: |