| // RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s |
| #include <pthread.h> |
| #include <stdlib.h> |
| #include <stdio.h> |
| #include <sched.h> |
| |
| struct Cache { |
| int x; |
| }; |
| |
| Cache g_cache; |
| |
| Cache *CreateCache() { |
| g_cache.x = rand(); |
| return &g_cache; |
| } |
| |
| _Atomic(Cache*) queue; |
| |
| void *Thread1(void *x) { |
| static Cache *c = CreateCache(); |
| __c11_atomic_store(&queue, c, 0); |
| return 0; |
| } |
| |
| void *Thread2(void *x) { |
| Cache *c = 0; |
| for (;;) { |
| c = __c11_atomic_load(&queue, 0); |
| if (c) |
| break; |
| sched_yield(); |
| } |
| if (c->x >= RAND_MAX) |
| exit(1); |
| return 0; |
| } |
| |
| int main() { |
| pthread_t t[2]; |
| pthread_create(&t[0], 0, Thread1, 0); |
| pthread_create(&t[1], 0, Thread2, 0); |
| pthread_join(t[0], 0); |
| pthread_join(t[1], 0); |
| } |
| |
| // CHECK: WARNING: ThreadSanitizer: data race |
