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 for 3 // cycles in lock-order graph after pthread_mutex_lock. 4 5 // RUN: %clangxx_tsan %s -o %t 6 // RUN: not %run %t 2>&1 | FileCheck %s 7 // XFAIL: * 8 #include <pthread.h> 9 #include <stdio.h> 10 #include <unistd.h> 11 12 pthread_mutex_t mu1, mu2; 13 pthread_barrier_t barrier; 14 15 void *Thread(void *p) { 16 // mu2 => mu1 17 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 26 int 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 => mu2 38 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
