1 // RUN: %clang_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
2 #include "test.h"
3
4 pthread_mutex_t Mtx;
5 int Global;
6
Thread2(void * x)7 void *Thread2(void *x) {
8 barrier_wait(&barrier);
9 // CHECK: WARNING: ThreadSanitizer: data race
10 // CHECK-NEXT: Atomic read of size 1 at {{.*}} by thread T2:
11 // CHECK-NEXT: #0 pthread_mutex_lock
12 // CHECK-NEXT: #1 Thread2{{.*}} {{.*}}race_on_mutex.c:[[@LINE+1]]{{(:3)?}} ({{.*}})
13 pthread_mutex_lock(&Mtx);
14 Global = 43;
15 pthread_mutex_unlock(&Mtx);
16 return NULL;
17 }
18
Thread1(void * x)19 void *Thread1(void *x) {
20 // CHECK: Previous write of size {{[0-9]+}} at {{.*}} by thread T1:
21 // CHECK: #{{[0-9]+}} {{.*}}pthread_mutex_init {{.*}} ({{.*}})
22 // CHECK-NEXT: #{{[0-9]+}} Thread1{{.*}} {{.*}}race_on_mutex.c:[[@LINE+1]]{{(:3)?}} ({{.*}})
23 pthread_mutex_init(&Mtx, 0);
24 pthread_mutex_lock(&Mtx);
25 Global = 42;
26 pthread_mutex_unlock(&Mtx);
27 barrier_wait(&barrier);
28 return NULL;
29 }
30
main()31 int main() {
32 barrier_init(&barrier, 2);
33 pthread_t t[2];
34 pthread_create(&t[0], NULL, Thread1, NULL);
35 pthread_create(&t[1], NULL, Thread2, NULL);
36 pthread_join(t[0], NULL);
37 pthread_join(t[1], NULL);
38 pthread_mutex_destroy(&Mtx);
39 return 0;
40 }
41