42 lines · cpp
1// RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s2#include "test.h"3 4/*5Annotations usage example.6 7Tsan does not see synchronization in barrier_wait.8ANNOTATE_HAPPENS_BEFORE/AFTER communicate the synchronization to tsan9and prevent the race report.10*/11 12int Global;13 14void *Thread1(void *x) {15 barrier_wait(&barrier);16 ANNOTATE_HAPPENS_AFTER(&barrier);17 Global++;18 return NULL;19}20 21void *Thread2(void *x) {22 Global--;23 ANNOTATE_HAPPENS_BEFORE(&barrier);24 barrier_wait(&barrier);25 return NULL;26}27 28int main() {29 barrier_init(&barrier, 2);30 pthread_t t[2];31 pthread_create(&t[0], NULL, Thread1, NULL);32 pthread_create(&t[1], NULL, Thread2, NULL);33 pthread_join(t[0], NULL);34 pthread_join(t[1], NULL);35 fprintf(stderr, "DONE\n");36 return 0;37}38 39// CHECK-NOT: WARNING: ThreadSanitizer: data race40// CHECK: DONE41 42