1 // RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
2 #include <pthread.h>
3 #include <stdlib.h>
4 #include <stdio.h>
5 #include <sched.h>
6
7 struct Cache {
8 int x;
9 };
10
11 Cache g_cache;
12
CreateCache()13 Cache *CreateCache() {
14 g_cache.x = rand();
15 return &g_cache;
16 }
17
18 _Atomic(Cache*) queue;
19
Thread1(void * x)20 void *Thread1(void *x) {
21 static Cache *c = CreateCache();
22 __c11_atomic_store(&queue, c, 0);
23 return 0;
24 }
25
Thread2(void * x)26 void *Thread2(void *x) {
27 Cache *c = 0;
28 for (;;) {
29 c = __c11_atomic_load(&queue, 0);
30 if (c)
31 break;
32 sched_yield();
33 }
34 if (c->x >= RAND_MAX)
35 exit(1);
36 return 0;
37 }
38
main()39 int main() {
40 pthread_t t[2];
41 pthread_create(&t[0], 0, Thread1, 0);
42 pthread_create(&t[1], 0, Thread2, 0);
43 pthread_join(t[0], 0);
44 pthread_join(t[1], 0);
45 }
46
47 // CHECK: WARNING: ThreadSanitizer: data race
48