1// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
2#include <pthread.h>
3#include <stdio.h>
4#include <unistd.h>
5
6int Global;
7pthread_mutex_t mtx;
8
9void *Thread1(void *x) {
10  sleep(1);
11  pthread_mutex_lock(&mtx);
12  Global++;
13  pthread_mutex_unlock(&mtx);
14  return NULL;
15}
16
17void *Thread2(void *x) {
18  Global--;
19  return NULL;
20}
21
22int main() {
23  // CHECK: WARNING: ThreadSanitizer: data race
24  // CHECK:   Write of size 4 at {{.*}} by thread T1
25  // CHECK:                         (mutexes: write [[M1:M[0-9]+]]):
26  // CHECK:   Previous write of size 4 at {{.*}} by thread T2:
27  // CHECK:   Mutex [[M1]] (0x{{.*}}) created at:
28  // CHECK:     #0 pthread_mutex_init
29  // CHECK:     #1 main {{.*}}/mutexset1.cc:[[@LINE+1]]
30  pthread_mutex_init(&mtx, 0);
31  pthread_t t[2];
32  pthread_create(&t[0], NULL, Thread1, NULL);
33  pthread_create(&t[1], NULL, Thread2, NULL);
34  pthread_join(t[0], NULL);
35  pthread_join(t[1], NULL);
36  pthread_mutex_destroy(&mtx);
37}
38