// 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 |