benign_race.cc revision 2d1fdb26e458c4ddc04155c1d421bced3ba90cd0 
1// RUN: %clang_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
2#include <pthread.h>
3#include <stdio.h>
4#include <unistd.h>
5
6int Global;
7int WTFGlobal;
8
9extern "C" {
10void AnnotateBenignRaceSized(const char *f, int l,
11                             void *mem, unsigned int size, const char *desc);
12void WTFAnnotateBenignRaceSized(const char *f, int l,
13                                void *mem, unsigned int size,
14                                const char *desc);
15}
16
17
18void *Thread(void *x) {
19  Global = 42;
20  WTFGlobal = 142;
21  return 0;
22}
23
24int main() {
25  AnnotateBenignRaceSized(__FILE__, __LINE__,
26                          &Global, sizeof(Global), "Race on Global");
27  WTFAnnotateBenignRaceSized(__FILE__, __LINE__,
28                             &WTFGlobal, sizeof(WTFGlobal),
29                             "Race on WTFGlobal");
30  pthread_t t;
31  pthread_create(&t, 0, Thread, 0);
32  sleep(1);
33  Global = 43;
34  WTFGlobal = 143;
35  pthread_join(t, 0);
36  printf("OK\n");
37}
38
39// CHECK-NOT: WARNING: ThreadSanitizer: data race
40