test/tsan/mutex_cycle2.c

   1 // RUN: %clangxx_tsan %s -o %t
   2 // RUN: TSAN_OPTIONS=detect_deadlocks=1 not %run %t 2>&1 | FileCheck %s
   3 // RUN: echo "deadlock:main" > sup
   4 // RUN: TSAN_OPTIONS="detect_deadlocks=1 suppressions=sup" %run %t
   5 // RUN: echo "deadlock:zzzz" > sup
   6 // RUN: TSAN_OPTIONS="detect_deadlocks=1 suppressions=sup" not %run %t 2>&1 | FileCheck %s
   7 #include <pthread.h>
   8
   9 int main() {
  10   pthread_mutex_t mu1, mu2;
  11   pthread_mutex_init(&mu1, NULL);
  12   pthread_mutex_init(&mu2, NULL);
  13
  14   // mu1 => mu2
  15   pthread_mutex_lock(&mu1);
  16   pthread_mutex_lock(&mu2);
  17   pthread_mutex_unlock(&mu2);
  18   pthread_mutex_unlock(&mu1);
  19
  20   // mu2 => mu1
  21   pthread_mutex_lock(&mu2);
  22   pthread_mutex_lock(&mu1);
  23   // CHECK: ThreadSanitizer: lock-order-inversion (potential deadlock)
  24   pthread_mutex_unlock(&mu1);
  25   pthread_mutex_unlock(&mu2);
  26
  27   pthread_mutex_destroy(&mu1);
  28   pthread_mutex_destroy(&mu2);
  29 }