51 lines · cpp
1// Test that the deadlock detector can find a deadlock that actually happened.2// Currently we will fail to report such a deadlock because we check for3// cycles in lock-order graph after pthread_mutex_lock.4 5// RUN: %clangxx_tsan %s -o %t6// RUN: not %run %t 2>&1 | FileCheck %s7// XFAIL: *8#include <pthread.h>9#include <stdio.h>10#include <unistd.h>11 12pthread_mutex_t mu1, mu2;13pthread_barrier_t barrier;14 15void *Thread(void *p) {16 // mu2 => mu117 pthread_mutex_lock(&mu2);18 pthread_barrier_wait(&barrier);19 pthread_mutex_lock(&mu1);20 // CHECK: ThreadSanitizer: lock-order-inversion (potential deadlock)21 pthread_mutex_unlock(&mu1);22 pthread_mutex_unlock(&mu2);23 return p;24}25 26int main() {27 pthread_mutex_init(&mu1, NULL);28 pthread_mutex_init(&mu2, NULL);29 pthread_barrier_init(&barrier, 0, 2);30 31 fprintf(stderr, "This test is going to deadlock and die in 3 seconds\n");32 alarm(3);33 34 pthread_t t;35 pthread_create(&t, 0, Thread, 0);36 37 // mu1 => mu238 pthread_mutex_lock(&mu1);39 pthread_barrier_wait(&barrier);40 pthread_mutex_lock(&mu2);41 pthread_mutex_unlock(&mu2);42 pthread_mutex_unlock(&mu1);43 44 pthread_join(t, 0);45 46 pthread_mutex_destroy(&mu1);47 pthread_mutex_destroy(&mu2);48 pthread_barrier_destroy(&barrier);49 fprintf(stderr, "FAILED\n");50}51