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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 
5 volatile int X;
6 volatile int N;
7 void (*volatile F)();
8 
foo()9 static void foo() {
10   if (--N == 0)
11     X = 42;
12   else
13     F();
14 }
15 
Thread(void * p)16 void *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 
main()27 int 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