1*bcaeed49SFangrui Song // RUN: %clangxx_tsan -O1 --std=c++11 %s -o %t && %deflake %run %t 2>&1 | FileCheck %s
2*bcaeed49SFangrui Song #include "custom_mutex.h"
3*bcaeed49SFangrui Song 
4*bcaeed49SFangrui Song // Test that failed TryLock does not induce parasitic synchronization.
5*bcaeed49SFangrui Song 
6*bcaeed49SFangrui Song Mutex mu(true, 0);
7*bcaeed49SFangrui Song long data;
8*bcaeed49SFangrui Song 
thr(void * arg)9*bcaeed49SFangrui Song void *thr(void *arg) {
10*bcaeed49SFangrui Song   mu.Lock();
11*bcaeed49SFangrui Song   data++;
12*bcaeed49SFangrui Song   mu.Unlock();
13*bcaeed49SFangrui Song   mu.Lock();
14*bcaeed49SFangrui Song   barrier_wait(&barrier);
15*bcaeed49SFangrui Song   barrier_wait(&barrier);
16*bcaeed49SFangrui Song   mu.Unlock();
17*bcaeed49SFangrui Song   return 0;
18*bcaeed49SFangrui Song }
19*bcaeed49SFangrui Song 
main()20*bcaeed49SFangrui Song int main() {
21*bcaeed49SFangrui Song   barrier_init(&barrier, 2);
22*bcaeed49SFangrui Song   pthread_t th;
23*bcaeed49SFangrui Song   pthread_create(&th, 0, thr, 0);
24*bcaeed49SFangrui Song   barrier_wait(&barrier);
25*bcaeed49SFangrui Song   if (mu.TryLock()) {
26*bcaeed49SFangrui Song     fprintf(stderr, "TryLock succeeded, should not\n");
27*bcaeed49SFangrui Song     exit(0);
28*bcaeed49SFangrui Song   }
29*bcaeed49SFangrui Song   data++;
30*bcaeed49SFangrui Song   barrier_wait(&barrier);
31*bcaeed49SFangrui Song   pthread_join(th, 0);
32*bcaeed49SFangrui Song   fprintf(stderr, "DONE\n");
33*bcaeed49SFangrui Song   return 0;
34*bcaeed49SFangrui Song }
35*bcaeed49SFangrui Song 
36*bcaeed49SFangrui Song // CHECK: ThreadSanitizer: data race
37*bcaeed49SFangrui Song // CHECK-NEXT:   Write of size 8 at {{.*}} by main thread:
38*bcaeed49SFangrui Song // CHECK-NEXT:     #0 main {{.*}}custom_mutex1.cpp:29
39*bcaeed49SFangrui Song // CHECK: DONE
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