compiler-rt/test/tsan/sleep_sync.cpp

   1 // RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
   2 #include "test.h"
   3
   4 int X = 0;
   5
   6 __attribute__((noinline)) void MySleep() {
   7   sleep(1);  // the sleep that must appear in the report
   8 }
   9
  10 void *Thread(void *p) {
  11   barrier_wait(&barrier);
  12   MySleep();  // Assume the main thread has done the write.
  13   X = 42;
  14   return 0;
  15 }
  16
  17 int main() {
  18   barrier_init(&barrier, 2);
  19   pthread_t t;
  20   pthread_create(&t, 0, Thread, 0);
  21   X = 43;
  22   barrier_wait(&barrier);
  23   pthread_join(t, 0);
  24   return 0;
  25 }
  26
  27 // CHECK: WARNING: ThreadSanitizer: data race
  28 // ...
  29 // CHECK:   As if synchronized via sleep:
  30 // CHECK-NEXT:     #0 sleep
  31 // CHECK-NEXT:     #1 MySleep
  32 // CHECK-NEXT:     #2 Thread