compiler-rt/test/tsan/race_on_mutex.c

   1 // RUN: %clang_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
   2 #include "test.h"
   3
   4 pthread_mutex_t Mtx;
   5 int Global;
   6
   7 void *Thread2(void *x) {
   8   barrier_wait(&barrier);
   9 // CHECK:      WARNING: ThreadSanitizer: data race
  10 // CHECK-NEXT:   Atomic read of size 1 at {{.*}} by thread T2:
  11 // CHECK-NEXT:     #0 pthread_mutex_lock
  12 // CHECK-NEXT:     #1 Thread2{{.*}} {{.*}}race_on_mutex.c:[[@LINE+1]]{{(:3)?}} ({{.*}})
  13   pthread_mutex_lock(&Mtx);
  14   Global = 43;
  15   pthread_mutex_unlock(&Mtx);
  16   return NULL;
  17 }
  18
  19 void *Thread1(void *x) {
  20 // CHECK:        Previous write of size {{[0-9]+}} at {{.*}} by thread T1:
  21 // CHECK:          #{{[0-9]+}} {{.*}}pthread_mutex_init {{.*}} ({{.*}})
  22 // CHECK-NEXT:     #{{[0-9]+}} Thread1{{.*}} {{.*}}race_on_mutex.c:[[@LINE+1]]{{(:3)?}} ({{.*}})
  23   pthread_mutex_init(&Mtx, 0);
  24   pthread_mutex_lock(&Mtx);
  25   Global = 42;
  26   pthread_mutex_unlock(&Mtx);
  27   barrier_wait(&barrier);
  28   return NULL;
  29 }
  30
  31 int main() {
  32   barrier_init(&barrier, 2);
  33   pthread_t t[2];
  34   pthread_create(&t[0], NULL, Thread1, NULL);
  35   pthread_create(&t[1], NULL, Thread2, NULL);
  36   pthread_join(t[0], NULL);
  37   pthread_join(t[1], NULL);
  38   pthread_mutex_destroy(&Mtx);
  39   return 0;
  40 }