compiler-rt/test/tsan/cond_destruction.cpp

   1 // RUN: %clangxx_tsan -O1 %s -o %t
   2 // RUN: %run %t 2>&1 | FileCheck %s
   3 // RUN: %run %t arg 2>&1 | FileCheck %s
   4 // RUN: %run %t arg arg 2>&1 | FileCheck %s
   5 #include "test.h"
   6
   7 // Test for destruction of pthread_cond_t.
   8 // POSIX states that it is safe  to destroy a condition variable upon which no
   9 // threads are currently blocked. That is, it is not necessary to wait untill
  10 // other threads return from pthread_cond_wait, they just need to be unblocked.
  11
  12 pthread_mutex_t m;
  13 pthread_cond_t c;
  14 bool done1, done2;
  15
  16 void *thr(void *p) {
  17   pthread_mutex_lock(&m);
  18   done1 = true;
  19   pthread_cond_signal(&c);
  20   while (!done2)
  21     pthread_cond_wait(&c, &m);
  22   pthread_mutex_unlock(&m);
  23   return 0;
  24 }
  25
  26 int main(int argc, char **argv) {
  27   pthread_t th;
  28   pthread_mutex_init(&m, 0);
  29   pthread_cond_init(&c, 0);
  30   pthread_create(&th, 0, thr, 0);
  31   pthread_mutex_lock(&m);
  32   while (!done1)
  33     pthread_cond_wait(&c, &m);
  34   done2 = true;
  35   // Any of these sequences is legal.
  36   if (argc == 1) {
  37     pthread_cond_signal(&c);
  38     pthread_mutex_unlock(&m);
  39     pthread_cond_destroy(&c);
  40   } else if (argc == 2) {
  41     pthread_mutex_unlock(&m);
  42     pthread_cond_signal(&c);
  43     pthread_cond_destroy(&c);
  44   } else {
  45     pthread_cond_signal(&c);
  46     pthread_cond_destroy(&c);
  47     pthread_mutex_unlock(&m);
  48   }
  49   pthread_join(th, 0);
  50   fprintf(stderr, "DONE\n");
  51 }
  52
  53 // CHECK-NOT: ThreadSanitizer: data race