[compiler-rt] r252696 - Implement `internal_start/join_thread` on Mac OS X

[Ismail Pazarbasi via llvm-commits]

Author: ismailp
Date: Tue Nov 10 20:44:19 2015
New Revision: 252696

URL: http://llvm.org/viewvc/llvm-project?rev=252696&view=rev
Log:
Implement `internal_start/join_thread` on Mac OS X

Summary: Depends on D9637

Test Plan:

Reviewers: kcc, glider, samsonov

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D9638

Modified:
    compiler-rt/trunk/lib/sanitizer_common/sanitizer_mac.cc

Modified: compiler-rt/trunk/lib/sanitizer_common/sanitizer_mac.cc
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/sanitizer_common/sanitizer_mac.cc?rev=252696&r1=252695&r2=252696&view=diff
==============================================================================
--- compiler-rt/trunk/lib/sanitizer_common/sanitizer_mac.cc (original)
+++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_mac.cc Tue Nov 10 20:44:19 2015
@@ -371,8 +371,18 @@ uptr GetRSS() {
   return info.resident_size;
 }
 
-void *internal_start_thread(void (*func)(void *arg), void *arg) { return 0; }
-void internal_join_thread(void *th) { }
+void *internal_start_thread(void(*func)(void *arg), void *arg) {
+  // Start the thread with signals blocked, otherwise it can steal user signals.
+  __sanitizer_sigset_t set, old;
+  internal_sigfillset(&set);
+  internal_sigprocmask(SIG_SETMASK, &set, &old);
+  pthread_t th;
+  pthread_create(&th, 0, (void*(*)(void *arg))func, arg);
+  internal_sigprocmask(SIG_SETMASK, &old, 0);
+  return th;
+}
+
+void internal_join_thread(void *th) { pthread_join((pthread_t)th, 0); }
 
 void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) {
   ucontext_t *ucontext = (ucontext_t*)context;