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
thr1(void * arg)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
thr2(void * arg)20 void *thr2(void *arg) {
21 barrier_wait(&barrier);
22 mu.Lock();
23 data++;
24 mu.Unlock();
25 return 0;
26 }
27
main()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
47