tsan: remove sleeps from tests

Even sleep(1) lead to episodical flakes on some machines.
Use an invisible by tsan barrier to enforce required execution order instead.
This makes the tests deterministic and faster.

llvm-svn: 226659

1 files changed, 4 insertions, 3 deletions

diff --git a/compiler-rt/test/tsan/malloc_stack.cc b/compiler-rt/test/tsan/malloc_stack.cc
index 6027360754a..ba1d62bcd9e 100644
--- a/compiler-rt/test/tsan/malloc_stack.cc
+++ b/compiler-rt/test/tsan/malloc_stack.cc
@@ -1,20 +1,21 @@
 // RUN: %clang_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
-#include <pthread.h>
-#include <unistd.h>
+#include "test.h"
 
 _Atomic(int*) p;
 
 void *thr(void *a) {
-  sleep(1);
+  barrier_wait(&barrier);
   int *pp = __c11_atomic_load(&p, __ATOMIC_RELAXED);
   *pp = 42;
   return 0;
 }
 
 int main() {
+  barrier_init(&barrier, 2);
   pthread_t th;
   pthread_create(&th, 0, thr, p);
   __c11_atomic_store(&p, new int, __ATOMIC_RELAXED);
+  barrier_wait(&barrier);
   pthread_join(th, 0);
 }