compiler-rt/test/tsan/custom_mutex3.cpp

   1 // RUN: %clangxx_tsan -O1 --std=c++11 %s -o %t
   2 // RUN: %env_tsan_opts=report_destroy_locked=0 %run %t 2>&1 | FileCheck %s
   3 #include "custom_mutex.h"
   4
   5 // Regression test for a bug.
   6 // Thr1 destroys a locked mutex, previously such mutex was not removed from
   7 // sync map and as the result subsequent uses of a mutex located at the same
   8 // address caused false race reports.
   9
  10 Mutex mu(false, __tsan_mutex_write_reentrant);
  11 long data;
  12
  13 void *thr1(void *arg) {
  14   mu.Lock();
  15   mu.~Mutex();
  16   new(&mu) Mutex(true, __tsan_mutex_write_reentrant);
  17   return 0;
  18 }
  19
  20 void *thr2(void *arg) {
  21   barrier_wait(&barrier);
  22   mu.Lock();
  23   data++;
  24   mu.Unlock();
  25   return 0;
  26 }
  27
  28 int main() {
  29   barrier_init(&barrier, 2);
  30   pthread_t th;
  31   pthread_create(&th, 0, thr1, 0);
  32   pthread_join(th, 0);
  33
  34   barrier_init(&barrier, 2);
  35   pthread_create(&th, 0, thr2, 0);
  36   mu.Lock();
  37   data++;
  38   mu.Unlock();
  39   barrier_wait(&barrier);
  40   pthread_join(th, 0);
  41   fprintf(stderr, "DONE\n");
  42   return 0;
  43 }
  44
  45 // CHECK-NOT: WARNING: ThreadSanitizer: data race
  46 // CHECK: DONE