compiler-rt/test/tsan/mutexset1.cpp

   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   barrier_wait(&barrier);
   9   pthread_mutex_lock(&mtx);
  10   Global++;
  11   pthread_mutex_unlock(&mtx);
  12   return NULL;
  13 }
  14
  15 void *Thread2(void *x) {
  16   Global--;
  17   barrier_wait(&barrier);
  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 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.cpp:[[@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 }