| 1 | // RUN: %clangxx_tsan %s -o %t |
|---|---|
| 2 | // RUN: not %run %t 5 2>&1 | FileCheck %s |
| 3 | // RUN: not %run %t 10 2>&1 | FileCheck %s |
| 4 | // RUN: not %run %t 15 2>&1 | FileCheck %s |
| 5 | // RUN: not %run %t 20 2>&1 | FileCheck %s |
| 6 | // RUN: %run %t 30 2>&1 | FileCheck %s --check-prefix=CHECK-TOO-LONG-CYCLE |
| 7 | |
| 8 | #include <pthread.h> |
| 9 | #include <stdio.h> |
| 10 | #include <stdlib.h> |
| 11 | |
| 12 | int main(int argc, char *argv[]) { |
| 13 | int num_mutexes = 5; |
| 14 | if (argc > 1) num_mutexes = atoi(nptr: argv[1]); |
| 15 | |
| 16 | pthread_mutex_t m[num_mutexes]; |
| 17 | for (int i = 0; i < num_mutexes; ++i) |
| 18 | pthread_mutex_init(mutex: &m[i], NULL); |
| 19 | |
| 20 | for (int i = 0; i < num_mutexes - 1; ++i) { |
| 21 | pthread_mutex_lock(mutex: &m[i]); |
| 22 | pthread_mutex_lock(mutex: &m[i + 1]); |
| 23 | |
| 24 | pthread_mutex_unlock(mutex: &m[i]); |
| 25 | pthread_mutex_unlock(mutex: &m[i + 1]); |
| 26 | } |
| 27 | |
| 28 | pthread_mutex_lock(mutex: &m[num_mutexes - 1]); |
| 29 | pthread_mutex_lock(mutex: &m[0]); |
| 30 | |
| 31 | pthread_mutex_unlock(mutex: &m[num_mutexes - 1]); |
| 32 | pthread_mutex_unlock(mutex: &m[0]); |
| 33 | |
| 34 | for (int i = 0; i < num_mutexes; ++i) |
| 35 | pthread_mutex_destroy(mutex: &m[i]); |
| 36 | |
| 37 | fprintf(stderr, format: "PASS\n"); |
| 38 | } |
| 39 | |
| 40 | // CHECK: ThreadSanitizer: lock-order-inversion (potential deadlock) |
| 41 | // CHECK-TOO-LONG-CYCLE: WARNING: too long mutex cycle found |
| 42 | // CHECK: PASS |
| 43 |