1*bcaeed49SFangrui Song // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
2*bcaeed49SFangrui Song // RUN: %clangxx_tsan -O2 %s -o %t && %run %t 2>&1 | FileCheck %s
3*bcaeed49SFangrui Song // RUN: %clangxx_tsan -O3 %s -o %t && %run %t 2>&1 | FileCheck %s
4*bcaeed49SFangrui Song //
5*bcaeed49SFangrui Song // Check that load widening is not tsan-hostile.
6*bcaeed49SFangrui Song #include <pthread.h>
7*bcaeed49SFangrui Song #include <stdio.h>
8*bcaeed49SFangrui Song #include <string.h>
9*bcaeed49SFangrui Song
10*bcaeed49SFangrui Song struct {
11*bcaeed49SFangrui Song int i;
12*bcaeed49SFangrui Song char c1, c2, c3, c4;
13*bcaeed49SFangrui Song } S;
14*bcaeed49SFangrui Song
15*bcaeed49SFangrui Song int G;
16*bcaeed49SFangrui Song
Thread1(void * x)17*bcaeed49SFangrui Song void *Thread1(void *x) {
18*bcaeed49SFangrui Song G = S.c1 + S.c3;
19*bcaeed49SFangrui Song return NULL;
20*bcaeed49SFangrui Song }
21*bcaeed49SFangrui Song
Thread2(void * x)22*bcaeed49SFangrui Song void *Thread2(void *x) {
23*bcaeed49SFangrui Song S.c2 = 1;
24*bcaeed49SFangrui Song return NULL;
25*bcaeed49SFangrui Song }
26*bcaeed49SFangrui Song
main()27*bcaeed49SFangrui Song int main() {
28*bcaeed49SFangrui Song pthread_t t[2];
29*bcaeed49SFangrui Song memset(&S, 123, sizeof(S));
30*bcaeed49SFangrui Song pthread_create(&t[0], NULL, Thread1, NULL);
31*bcaeed49SFangrui Song pthread_create(&t[1], NULL, Thread2, NULL);
32*bcaeed49SFangrui Song pthread_join(t[0], NULL);
33*bcaeed49SFangrui Song pthread_join(t[1], NULL);
34*bcaeed49SFangrui Song fprintf(stderr, "PASS\n");
35*bcaeed49SFangrui Song }
36*bcaeed49SFangrui Song
37*bcaeed49SFangrui Song // CHECK-NOT: WARNING: ThreadSanitizer: data race
38*bcaeed49SFangrui Song // CHECK: PASS
39