| 1 | // RUN: %clangxx_tsan -O1 --std=c++11 %s -o %t && %deflake %run %t 2>&1 | FileCheck %s |
|---|---|
| 2 | #include "custom_mutex.h" |
| 3 | |
| 4 | // Test that failed TryLock does not induce parasitic synchronization. |
| 5 | |
| 6 | Mutex mu(true, 0); |
| 7 | long data; |
| 8 | |
| 9 | void *thr(void *arg) { |
| 10 | mu.Lock(); |
| 11 | data++; |
| 12 | mu.Unlock(); |
| 13 | mu.Lock(); |
| 14 | barrier_wait(barrier: &barrier); |
| 15 | barrier_wait(barrier: &barrier); |
| 16 | mu.Unlock(); |
| 17 | return 0; |
| 18 | } |
| 19 | |
| 20 | int main() { |
| 21 | barrier_init(barrier: &barrier, count: 2); |
| 22 | pthread_t th; |
| 23 | pthread_create(newthread: &th, attr: 0, start_routine: thr, arg: 0); |
| 24 | barrier_wait(barrier: &barrier); |
| 25 | if (mu.TryLock()) { |
| 26 | fprintf(stderr, format: "TryLock succeeded, should not\n"); |
| 27 | exit(status: 0); |
| 28 | } |
| 29 | data++; |
| 30 | barrier_wait(barrier: &barrier); |
| 31 | pthread_join(th: th, thread_return: 0); |
| 32 | fprintf(stderr, format: "DONE\n"); |
| 33 | return 0; |
| 34 | } |
| 35 | |
| 36 | // CHECK: ThreadSanitizer: data race |
| 37 | // CHECK-NEXT: Write of size 8 at {{.*}} by main thread: |
| 38 | // CHECK-NEXT: #0 main {{.*}}custom_mutex1.cpp:29 |
| 39 | // CHECK: DONE |
| 40 |