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// Test that the deadlock detector can find a deadlock that actually happened.
// Currently we will fail to report such a deadlock because we check for
// cycles in lock-order graph after pthread_mutex_lock.
// RUN: %clangxx_tsan %s -o %t
// RUN: not %run %t 2>&1 | FileCheck %s
// XFAIL: *
#include <pthread.h>
#include <stdio.h>
#include <unistd.h>
pthread_mutex_t mu1, mu2;
pthread_barrier_t barrier;
void *Thread(void *p) {
// mu2 => mu1
pthread_mutex_lock(&mu2);
pthread_barrier_wait(&barrier);
pthread_mutex_lock(&mu1);
// CHECK: ThreadSanitizer: lock-order-inversion (potential deadlock)
pthread_mutex_unlock(&mu1);
pthread_mutex_unlock(&mu2);
return p;
}
int main() {
pthread_mutex_init(&mu1, NULL);
pthread_mutex_init(&mu2, NULL);
pthread_barrier_init(&barrier, 0, 2);
fprintf(stderr, "This test is going to deadlock and die in 3 seconds\n");
alarm(3);
pthread_t t;
pthread_create(&t, 0, Thread, 0);
// mu1 => mu2
pthread_mutex_lock(&mu1);
pthread_barrier_wait(&barrier);
pthread_mutex_lock(&mu2);
pthread_mutex_unlock(&mu2);
pthread_mutex_unlock(&mu1);
pthread_join(t, 0);
pthread_mutex_destroy(&mu1);
pthread_mutex_destroy(&mu2);
pthread_barrier_destroy(&barrier);
fprintf(stderr, "FAILED\n");
}
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