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