test/tsan/mutexset3.cc

   1 // RUN: %clangxx_tsan -O1 %s -o %t && not %t 2>&1 | FileCheck %s
   2 #include <pthread.h>
   3 #include <stdio.h>
   4 #include <unistd.h>
   5
   6 int Global;
   7 pthread_mutex_t mtx1;
   8 pthread_mutex_t mtx2;
   9
  10 void *Thread1(void *x) {
  11   sleep(1);
  12   pthread_mutex_lock(&mtx1);
  13   pthread_mutex_lock(&mtx2);
  14   Global++;
  15   pthread_mutex_unlock(&mtx2);
  16   pthread_mutex_unlock(&mtx1);
  17   return NULL;
  18 }
  19
  20 void *Thread2(void *x) {
  21   Global--;
  22   return NULL;
  23 }
  24
  25 int main() {
  26   // CHECK: WARNING: ThreadSanitizer: data race
  27   // CHECK: Write of size 4 at {{.*}} by thread T1
  28   // CHECK:               (mutexes: write [[M1:M[0-9]+]], write [[M2:M[0-9]+]]):
  29   // CHECK:   Previous write of size 4 at {{.*}} by thread T2:
  30   // CHECK:   Mutex [[M1]] (0x{{.*}}) created at:
  31   // CHECK:     #0 pthread_mutex_init
  32   // CHECK:     #1 main {{.*}}/mutexset3.cc:[[@LINE+4]]
  33   // CHECK:   Mutex [[M2]] (0x{{.*}}) created at:
  34   // CHECK:     #0 pthread_mutex_init
  35   // CHECK:     #1 main {{.*}}/mutexset3.cc:[[@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 }