1*bcaeed49SFangrui Song // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
2*bcaeed49SFangrui Song #include "test.h"
3*bcaeed49SFangrui Song
4*bcaeed49SFangrui Song /*
5*bcaeed49SFangrui Song Annotations usage example.
6*bcaeed49SFangrui Song
7*bcaeed49SFangrui Song Tsan does not see synchronization in barrier_wait.
8*bcaeed49SFangrui Song ANNOTATE_HAPPENS_BEFORE/AFTER communicate the synchronization to tsan
9*bcaeed49SFangrui Song and prevent the race report.
10*bcaeed49SFangrui Song */
11*bcaeed49SFangrui Song
12*bcaeed49SFangrui Song int Global;
13*bcaeed49SFangrui Song
Thread1(void * x)14*bcaeed49SFangrui Song void *Thread1(void *x) {
15*bcaeed49SFangrui Song barrier_wait(&barrier);
16*bcaeed49SFangrui Song ANNOTATE_HAPPENS_AFTER(&barrier);
17*bcaeed49SFangrui Song Global++;
18*bcaeed49SFangrui Song return NULL;
19*bcaeed49SFangrui Song }
20*bcaeed49SFangrui Song
Thread2(void * x)21*bcaeed49SFangrui Song void *Thread2(void *x) {
22*bcaeed49SFangrui Song Global--;
23*bcaeed49SFangrui Song ANNOTATE_HAPPENS_BEFORE(&barrier);
24*bcaeed49SFangrui Song barrier_wait(&barrier);
25*bcaeed49SFangrui Song return NULL;
26*bcaeed49SFangrui Song }
27*bcaeed49SFangrui Song
main()28*bcaeed49SFangrui Song int main() {
29*bcaeed49SFangrui Song barrier_init(&barrier, 2);
30*bcaeed49SFangrui Song pthread_t t[2];
31*bcaeed49SFangrui Song pthread_create(&t[0], NULL, Thread1, NULL);
32*bcaeed49SFangrui Song pthread_create(&t[1], NULL, Thread2, NULL);
33*bcaeed49SFangrui Song pthread_join(t[0], NULL);
34*bcaeed49SFangrui Song pthread_join(t[1], NULL);
35*bcaeed49SFangrui Song fprintf(stderr, "DONE\n");
36*bcaeed49SFangrui Song return 0;
37*bcaeed49SFangrui Song }
38*bcaeed49SFangrui Song
39*bcaeed49SFangrui Song // CHECK-NOT: WARNING: ThreadSanitizer: data race
40*bcaeed49SFangrui Song // CHECK: DONE
41*bcaeed49SFangrui Song
42