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