compiler-rt/test/tsan/mutexset4.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 mtx1;
   6 pthread_mutex_t mtx2;
   7
   8 void *Thread1(void *x) {
   9   pthread_mutex_lock(&mtx1);
  10   pthread_mutex_lock(&mtx2);
  11   Global++;
  12   pthread_mutex_unlock(&mtx2);
  13   pthread_mutex_unlock(&mtx1);
  14   barrier_wait(&barrier);
  15   return NULL;
  16 }
  17
  18 void *Thread2(void *x) {
  19   barrier_wait(&barrier);
  20   Global--;
  21   return NULL;
  22 }
  23
  24 int main() {
  25   barrier_init(&barrier, 2);
  26   // CHECK: WARNING: ThreadSanitizer: data race
  27   // CHECK:   Write of size 4 at {{.*}} by thread T2:
  28   // CHECK:   Previous write of size 4 at {{.*}} by thread T1
  29   // CHECK:                 (mutexes: write [[M1:M[0-9]+]], write [[M2:M[0-9]+]]):
  30   // CHECK:   Mutex [[M1]] (0x{{.*}}) created at:
  31   // CHECK:     #0 pthread_mutex_init
  32   // CHECK:     #1 main {{.*}}mutexset4.cpp:[[@LINE+4]]
  33   // CHECK:   Mutex [[M2]] (0x{{.*}}) created at:
  34   // CHECK:     #0 pthread_mutex_init
  35   // CHECK:     #1 main {{.*}}mutexset4.cpp:[[@LINE+2]]
  36   pthread_mutex_init(&mtx1, 0);
  37   pthread_mutex_init(&mtx2, 0);
  38   pthread_t t[2];
  39   pthread_create(&t[0], NULL, Thread1, NULL);
  40   pthread_create(&t[1], NULL, Thread2, NULL);
  41   pthread_join(t[0], NULL);
  42   pthread_join(t[1], NULL);
  43   pthread_mutex_destroy(&mtx1);
  44   pthread_mutex_destroy(&mtx2);
  45 }