compiler-rt/test/tsan/Linux/mutex_robust2.cpp

   1 // RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
   2 #include <pthread.h>
   3 #include <stdlib.h>
   4 #include <stdio.h>
   5 #include <unistd.h>
   6 #include <errno.h>
   7
   8 pthread_mutex_t m;
   9 int x;
  10
  11 void *thr(void *p) {
  12   pthread_mutex_lock(&m);
  13   x = 42;
  14   return 0;
  15 }
  16
  17 int main() {
  18   pthread_mutexattr_t a;
  19   pthread_mutexattr_init(&a);
  20   pthread_mutexattr_setrobust(&a, PTHREAD_MUTEX_ROBUST);
  21   pthread_mutex_init(&m, &a);
  22   pthread_t th;
  23   pthread_create(&th, 0, thr, 0);
  24   sleep(1);
  25   if (pthread_mutex_trylock(&m) != EOWNERDEAD) {
  26     fprintf(stderr, "not EOWNERDEAD\n");
  27     exit(1);
  28   }
  29   x = 43;
  30   pthread_join(th, 0);
  31   fprintf(stderr, "DONE\n");
  32 }
  33
  34 // This is a false positive, tsan must not bark at the data race.
  35 // But currently it does.
  36 // CHECK-NOT: WARNING: ThreadSanitizer WARNING: double lock of mutex
  37 // CHECK: WARNING: ThreadSanitizer: data race
  38 // CHECK-NOT: EOWNERDEAD
  39 // CHECK: DONE
  40 // CHECK-NOT: WARNING: ThreadSanitizer
  41