compiler-rt/lib/tsan/lit_tests/mutex_cycle2.c


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// RUN: %clangxx_tsan %s -o %t
// RUN: TSAN_OPTIONS=detect_deadlocks=1 %t 2>&1 | FileCheck %s
#include <pthread.h>

int main() {
  pthread_mutex_t mu1, mu2;
  pthread_mutex_init(&mu1, NULL);
  pthread_mutex_init(&mu2, NULL);

  // mu1 => mu2
  pthread_mutex_lock(&mu1);
  pthread_mutex_lock(&mu2);
  pthread_mutex_unlock(&mu2);
  pthread_mutex_unlock(&mu1);

  // mu2 => mu1
  pthread_mutex_lock(&mu2);
  pthread_mutex_lock(&mu1);
  // CHECK: ThreadSanitizer: lock-order-inversion (potential deadlock)
  pthread_mutex_unlock(&mu1);
  pthread_mutex_unlock(&mu2);

  pthread_mutex_destroy(&mu1);
  pthread_mutex_destroy(&mu2);
}