3ab6b2347e
Even sleep(1) lead to episodical flakes on some machines. Use an invisible by tsan barrier to enforce required execution order instead. This makes the tests deterministic and faster. llvm-svn: 226659
37 lines
958 B
C++
37 lines
958 B
C++
// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
|
|
#include "test.h"
|
|
|
|
pthread_rwlock_t rwlock;
|
|
int GLOB;
|
|
|
|
void *Thread1(void *p) {
|
|
(void)p;
|
|
pthread_rwlock_rdlock(&rwlock);
|
|
barrier_wait(&barrier);
|
|
// Write under reader lock.
|
|
GLOB++;
|
|
pthread_rwlock_unlock(&rwlock);
|
|
return 0;
|
|
}
|
|
|
|
int main(int argc, char *argv[]) {
|
|
barrier_init(&barrier, 2);
|
|
pthread_rwlock_init(&rwlock, NULL);
|
|
pthread_rwlock_rdlock(&rwlock);
|
|
pthread_t t;
|
|
pthread_create(&t, 0, Thread1, 0);
|
|
volatile int x = GLOB;
|
|
(void)x;
|
|
pthread_rwlock_unlock(&rwlock);
|
|
barrier_wait(&barrier);
|
|
pthread_join(t, 0);
|
|
pthread_rwlock_destroy(&rwlock);
|
|
return 0;
|
|
}
|
|
|
|
// CHECK: WARNING: ThreadSanitizer: data race
|
|
// CHECK: Write of size 4 at {{.*}} by thread T1{{.*}}:
|
|
// CHECK: #0 Thread1(void*) {{.*}}write_in_reader_lock.cc:12
|
|
// CHECK: Previous read of size 4 at {{.*}} by main thread{{.*}}:
|
|
// CHECK: #0 main {{.*}}write_in_reader_lock.cc:23
|