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 Thread1(void * p)7void *Thread1(void *p) { 8 (void)p; 9 pthread_rwlock_rdlock(&rwlock); 10 barrier_wait(&barrier); 11 // Write under reader lock. 12 GLOB++; 13 pthread_rwlock_unlock(&rwlock); 14 return 0; 15 } 16 main(int argc,char * argv[])17int main(int argc, char *argv[]) { 18 barrier_init(&barrier, 2); 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 barrier_wait(&barrier); 27 pthread_join(t, 0); 28 pthread_rwlock_destroy(&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