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      1 // RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
      2 #include "test.h"
      3 
      4 int Global;
      5 pthread_mutex_t mtx;
      6 
      7 void *Thread1(void *x) {
      8   pthread_mutex_lock(&mtx);
      9   Global++;
     10   pthread_mutex_unlock(&mtx);
     11   barrier_wait(&barrier);
     12   return NULL;
     13 }
     14 
     15 void *Thread2(void *x) {
     16   barrier_wait(&barrier);
     17   Global--;
     18   return NULL;
     19 }
     20 
     21 int main() {
     22   barrier_init(&barrier, 2);
     23   // CHECK: WARNING: ThreadSanitizer: data race
     24   // CHECK:   Write of size 4 at {{.*}} by thread T2:
     25   // CHECK:   Previous write of size 4 at {{.*}} by thread T1
     26   // CHECK:                     (mutexes: write [[M1:M[0-9]+]]):
     27   // CHECK:   Mutex [[M1]] (0x{{.*}}) created at:
     28   // CHECK:     #0 pthread_mutex_init
     29   // CHECK:     #1 main {{.*}}mutexset2.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