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 Broadcast 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   barrier_wait(&barrier);
11*bcaeed49SFangrui Song   mu.Lock();
12*bcaeed49SFangrui Song   data++;
13*bcaeed49SFangrui Song   mu.Unlock();
14*bcaeed49SFangrui Song   data++;
15*bcaeed49SFangrui Song   mu.Broadcast();
16*bcaeed49SFangrui Song   return 0;
17*bcaeed49SFangrui Song }
18*bcaeed49SFangrui Song 
main()19*bcaeed49SFangrui Song int main() {
20*bcaeed49SFangrui Song   barrier_init(&barrier, 2);
21*bcaeed49SFangrui Song   pthread_t th;
22*bcaeed49SFangrui Song   pthread_create(&th, 0, thr, 0);
23*bcaeed49SFangrui Song   mu.Lock();
24*bcaeed49SFangrui Song   barrier_wait(&barrier);
25*bcaeed49SFangrui Song   while (data == 0)
26*bcaeed49SFangrui Song     mu.Wait();
27*bcaeed49SFangrui Song   mu.Unlock();
28*bcaeed49SFangrui Song   pthread_join(th, 0);
29*bcaeed49SFangrui Song   fprintf(stderr, "DONE\n");
30*bcaeed49SFangrui Song   return 0;
31*bcaeed49SFangrui Song }
32*bcaeed49SFangrui Song 
33*bcaeed49SFangrui Song // CHECK: ThreadSanitizer: data race
34*bcaeed49SFangrui Song // CHECK: DONE
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