#include <pthread.h>
#include <unistd.h>
int X = 0;
void *Thread(void *p) {
X = 42;
return 0;
}
int main() {
pthread_t t;
usleep(100*1000);
pthread_create(&t, 0, Thread, 0);
X = 43;
pthread_join(t, 0);
return 0;
}
// CHECK: WARNING: ThreadSanitizer: data race
// CHECK-NOT: As if synchronized via sleep