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 int *g;
5*bcaeed49SFangrui Song
Thread(void * a)6*bcaeed49SFangrui Song void *Thread(void *a) {
7*bcaeed49SFangrui Song int *p = 0;
8*bcaeed49SFangrui Song while ((p = __atomic_load_n(&g, __ATOMIC_RELAXED)) == 0)
9*bcaeed49SFangrui Song usleep(100); // spin-wait
10*bcaeed49SFangrui Song *p = 42;
11*bcaeed49SFangrui Song return 0;
12*bcaeed49SFangrui Song }
13*bcaeed49SFangrui Song
main()14*bcaeed49SFangrui Song int main() {
15*bcaeed49SFangrui Song pthread_t t;
16*bcaeed49SFangrui Song pthread_create(&t, 0, Thread, 0);
17*bcaeed49SFangrui Song AnnotateIgnoreWritesBegin(__FILE__, __LINE__);
18*bcaeed49SFangrui Song int *p = new int(0);
19*bcaeed49SFangrui Song AnnotateIgnoreWritesEnd(__FILE__, __LINE__);
20*bcaeed49SFangrui Song __atomic_store_n(&g, p, __ATOMIC_RELAXED);
21*bcaeed49SFangrui Song pthread_join(t, 0);
22*bcaeed49SFangrui Song delete p;
23*bcaeed49SFangrui Song fprintf(stderr, "OK\n");
24*bcaeed49SFangrui Song return 0;
25*bcaeed49SFangrui Song }
26*bcaeed49SFangrui Song
27*bcaeed49SFangrui Song // CHECK-NOT: WARNING: ThreadSanitizer: data race
28*bcaeed49SFangrui Song // CHECK: OK
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