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 thr(void * arg)9void *thr(void *arg) { 10 mu.Lock(); 11 data++; 12 mu.Unlock(); 13 mu.Lock(); 14 barrier_wait(&barrier); 15 barrier_wait(&barrier); 16 mu.Unlock(); 17 return 0; 18 } 19 main()20int main() { 21 barrier_init(&barrier, 2); 22 pthread_t th; 23 pthread_create(&th, 0, thr, 0); 24 barrier_wait(&barrier); 25 if (mu.TryLock()) { 26 fprintf(stderr, "TryLock succeeded, should not\n"); 27 exit(0); 28 } 29 data++; 30 barrier_wait(&barrier); 31 pthread_join(th, 0); 32 fprintf(stderr, "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