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 13 Cache *CreateCache() { 14 g_cache.x = rand(); 15 return &g_cache; 16 } 17 18 _Atomic(Cache*) queue; 19 20 void *Thread1(void *x) { 21 static Cache *c = CreateCache(); 22 __c11_atomic_store(&queue, c, 0); 23 return 0; 24 } 25 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 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
