| 1 | // RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s |
|---|---|
| 2 | #include "test.h" |
| 3 | |
| 4 | pthread_rwlock_t rwlock; |
| 5 | int GLOB; |
| 6 | |
| 7 | void *Thread1(void *p) { |
| 8 | (void)p; |
| 9 | pthread_rwlock_rdlock(rwlock: &rwlock); |
| 10 | barrier_wait(barrier: &barrier); |
| 11 | // Write under reader lock. |
| 12 | GLOB++; |
| 13 | pthread_rwlock_unlock(rwlock: &rwlock); |
| 14 | return 0; |
| 15 | } |
| 16 | |
| 17 | int main(int argc, char *argv[]) { |
| 18 | barrier_init(barrier: &barrier, count: 2); |
| 19 | pthread_rwlock_init(rwlock: &rwlock, NULL); |
| 20 | pthread_rwlock_rdlock(rwlock: &rwlock); |
| 21 | pthread_t t; |
| 22 | pthread_create(newthread: &t, attr: 0, start_routine: Thread1, arg: 0); |
| 23 | volatile int x = GLOB; |
| 24 | (void)x; |
| 25 | pthread_rwlock_unlock(rwlock: &rwlock); |
| 26 | barrier_wait(barrier: &barrier); |
| 27 | pthread_join(th: t, thread_return: 0); |
| 28 | pthread_rwlock_destroy(rwlock: &rwlock); |
| 29 | return 0; |
| 30 | } |
| 31 | |
| 32 | // CHECK: WARNING: ThreadSanitizer: data race |
| 33 | // CHECK: Write of size 4 at {{.*}} by thread T1{{.*}}: |
| 34 | // CHECK: #0 Thread1(void*) {{.*}}write_in_reader_lock.cpp:12 |
| 35 | // CHECK: Previous read of size 4 at {{.*}} by main thread{{.*}}: |
| 36 | // CHECK: #0 main {{.*}}write_in_reader_lock.cpp:23 |
| 37 |