1// RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
2// Race between an aligned access and an unaligned access, which
3// touches the same memory region.
4// This is a real race which is not detected by tsan.
5// https://code.google.com/p/thread-sanitizer/issues/detail?id=17
6#include <pthread.h>
7#include <stdio.h>
8#include <stdint.h>
9
10uint64_t Global[2];
11
12void *Thread1(void *x) {
13  Global[1]++;
14  return NULL;
15}
16
17void *Thread2(void *x) {
18  char *p1 = reinterpret_cast<char *>(&Global[0]);
19  uint64_t *p4 = reinterpret_cast<uint64_t *>(p1 + 1);
20  (*p4)++;
21  return NULL;
22}
23
24int main() {
25  pthread_t t[2];
26  pthread_create(&t[0], NULL, Thread1, NULL);
27  pthread_create(&t[1], NULL, Thread2, NULL);
28  pthread_join(t[0], NULL);
29  pthread_join(t[1], NULL);
30  printf("Pass\n");
31  // CHECK-NOT: ThreadSanitizer: data race
32  // CHECK: Pass
33  return 0;
34}
35