1// RUN: %clangxx_tsan -O1 %s -o %t -DORDER1 && %deflake %run %t | FileCheck %s
2// RUN: %clangxx_tsan -O1 %s -o %t -DORDER2 && %deflake %run %t | FileCheck %s
3#include "test.h"
4
5volatile int X;
6volatile int N;
7void (*volatile F)();
8
9static void foo() {
10  if (--N == 0)
11    X = 42;
12  else
13    F();
14}
15
16void *Thread(void *p) {
17#ifdef ORDER1
18  barrier_wait(&barrier);
19#endif
20  F();
21#ifdef ORDER2
22  barrier_wait(&barrier);
23#endif
24  return 0;
25}
26
27int main() {
28  barrier_init(&barrier, 2);
29  N = 50000;
30  F = foo;
31  pthread_t t;
32  pthread_attr_t a;
33  pthread_attr_init(&a);
34  pthread_attr_setstacksize(&a, N * 256 + (1 << 20));
35  pthread_create(&t, &a, Thread, 0);
36#ifdef ORDER2
37  barrier_wait(&barrier);
38#endif
39  X = 43;
40#ifdef ORDER1
41  barrier_wait(&barrier);
42#endif
43
44  pthread_join(t, 0);
45}
46
47// CHECK: WARNING: ThreadSanitizer: data race
48// CHECK:    #100 foo
49// We must output suffucuently large stack (at least 100 frames)
50
51