1// RUN: %clang_tsan %s -o %t
2// RUN: %run %t 2>&1 | FileCheck %s --implicit-check-not='ThreadSanitizer'
3
4#include <os/lock.h>
5#include <pthread.h>
6#include <stdio.h>
7
8long global_variable;
9os_unfair_lock lock = OS_UNFAIR_LOCK_INIT;
10
11void *Thread(void *a) {
12 os_unfair_lock_lock(&lock);
13 global_variable++;
14 os_unfair_lock_unlock(&lock);
15 return NULL;
16}
17
18int main() {
19 pthread_t t1, t2;
20 global_variable = 0;
21 pthread_create(newthread: &t1, NULL, start_routine: Thread, NULL);
22 pthread_create(newthread: &t2, NULL, start_routine: Thread, NULL);
23 pthread_join(th: t1, NULL);
24 pthread_join(th: t2, NULL);
25 fprintf(stderr, format: "global_variable = %ld\n", global_variable);
26}
27
28// CHECK: global_variable = 2
29

source code of compiler-rt/test/tsan/Darwin/os_unfair_lock.c