1 // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
2 #include <libkern/OSAtomic.h>
3 #include <pthread.h>
4 #include <stdio.h>
5 
6 int Global;
7 OSSpinLock lock;
8 
9 void *Thread(void *x) {
10   OSSpinLockLock(&lock);
11   Global++;
12   OSSpinLockUnlock(&lock);
13   return NULL;
14 }
15 
16 int main() {
17   fprintf(stderr, "Hello world.\n");
18 
19   pthread_t t[2];
20   pthread_create(&t[0], NULL, Thread, NULL);
21   pthread_create(&t[1], NULL, Thread, NULL);
22   pthread_join(t[0], NULL);
23   pthread_join(t[1], NULL);
24 
25   fprintf(stderr, "Done.\n");
26 }
27 
28 // CHECK: Hello world.
29 // CHECK: Done.
30 // CHECK-NOT: WARNING: ThreadSanitizer
31