forked from OSchip/llvm-project
43 lines
1.1 KiB
C
43 lines
1.1 KiB
C
// RUN: %clangxx_tsan %s -o %t
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// RUN: not %run %t 5 2>&1 | FileCheck %s
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// RUN: not %run %t 10 2>&1 | FileCheck %s
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// RUN: not %run %t 15 2>&1 | FileCheck %s
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// RUN: not %run %t 20 2>&1 | FileCheck %s
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// RUN: %run %t 30 2>&1 | FileCheck %s --check-prefix=CHECK-TOO-LONG-CYCLE
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#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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int main(int argc, char *argv[]) {
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int num_mutexes = 5;
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if (argc > 1) num_mutexes = atoi(argv[1]);
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pthread_mutex_t m[num_mutexes];
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for (int i = 0; i < num_mutexes; ++i)
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pthread_mutex_init(&m[i], NULL);
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for (int i = 0; i < num_mutexes - 1; ++i) {
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pthread_mutex_lock(&m[i]);
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pthread_mutex_lock(&m[i + 1]);
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pthread_mutex_unlock(&m[i]);
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pthread_mutex_unlock(&m[i + 1]);
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}
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pthread_mutex_lock(&m[num_mutexes - 1]);
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pthread_mutex_lock(&m[0]);
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pthread_mutex_unlock(&m[num_mutexes - 1]);
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pthread_mutex_unlock(&m[0]);
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for (int i = 0; i < num_mutexes; ++i)
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pthread_mutex_destroy(&m[i]);
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fprintf(stderr, "PASS\n");
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}
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// CHECK: ThreadSanitizer: lock-order-inversion (potential deadlock)
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// CHECK-TOO-LONG-CYCLE: WARNING: too long mutex cycle found
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// CHECK: PASS
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