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#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
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