test/tsan/sleep_sync.cc

   1 // RUN: %clangxx_tsan -O1 %s -o %t && not %t 2>&1 | FileCheck %s
   2 #include <pthread.h>
   3 #include <unistd.h>
   4
   5 int X = 0;
   6
   7 void MySleep() {
   8   sleep(1);
   9 }
  10
  11 void *Thread(void *p) {
  12   MySleep();  // Assume the main thread has done the write.
  13   X = 42;
  14   return 0;
  15 }
  16
  17 int main() {
  18   pthread_t t;
  19   pthread_create(&t, 0, Thread, 0);
  20   X = 43;
  21   pthread_join(t, 0);
  22   return 0;
  23 }
  24
  25 // CHECK: WARNING: ThreadSanitizer: data race
  26 // ...
  27 // CHECK:   As if synchronized via sleep:
  28 // CHECK-NEXT:     #0 sleep
  29 // CHECK-NEXT:     #1 MySleep
  30 // CHECK-NEXT:     #2 Thread