1// RUN: %clang_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
2#include <pthread.h>
3#include <stdio.h>
4#include <unistd.h>
5
6int Global;
7
8void __attribute__((noinline)) foo1() {
9  Global = 42;
10}
11
12void __attribute__((noinline)) bar1() {
13  volatile int tmp = 42; (void)tmp;
14  foo1();
15}
16
17void __attribute__((noinline)) foo2() {
18  volatile int v = Global; (void)v;
19}
20
21void __attribute__((noinline)) bar2() {
22  volatile int tmp = 42; (void)tmp;
23  foo2();
24}
25
26void *Thread1(void *x) {
27  sleep(1);
28  bar1();
29  return NULL;
30}
31
32void *Thread2(void *x) {
33  bar2();
34  return NULL;
35}
36
37void StartThread(pthread_t *t, void *(*f)(void*)) {
38  pthread_create(t, NULL, f, NULL);
39}
40
41int main() {
42  pthread_t t[2];
43  StartThread(&t[0], Thread1);
44  StartThread(&t[1], Thread2);
45  pthread_join(t[0], NULL);
46  pthread_join(t[1], NULL);
47  return 0;
48}
49
50// CHECK:      WARNING: ThreadSanitizer: data race
51// CHECK-NEXT:   Write of size 4 at {{.*}} by thread T1:
52// CHECK-NEXT:     #0 foo1{{.*}} {{.*}}simple_stack.c:9{{(:3)?}} ({{.*}})
53// CHECK-NEXT:     #1 bar1{{.*}} {{.*}}simple_stack.c:14{{(:3)?}} ({{.*}})
54// CHECK-NEXT:     #2 Thread1{{.*}} {{.*}}simple_stack.c:28{{(:3)?}} ({{.*}})
55// CHECK:        Previous read of size 4 at {{.*}} by thread T2:
56// CHECK-NEXT:     #0 foo2{{.*}} {{.*}}simple_stack.c:18{{(:26)?}} ({{.*}})
57// CHECK-NEXT:     #1 bar2{{.*}} {{.*}}simple_stack.c:23{{(:3)?}} ({{.*}})
58// CHECK-NEXT:     #2 Thread2{{.*}} {{.*}}simple_stack.c:33{{(:3)?}} ({{.*}})
59// CHECK:        Thread T1 (tid={{.*}}, running) created by main thread at:
60// CHECK-NEXT:     #0 pthread_create {{.*}} ({{.*}})
61// CHECK-NEXT:     #1 StartThread{{.*}} {{.*}}simple_stack.c:38{{(:3)?}} ({{.*}})
62// CHECK-NEXT:     #2 main{{.*}} {{.*}}simple_stack.c:43{{(:3)?}} ({{.*}})
63// CHECK:        Thread T2 ({{.*}}) created by main thread at:
64// CHECK-NEXT:     #0 pthread_create {{.*}} ({{.*}})
65// CHECK-NEXT:     #1 StartThread{{.*}} {{.*}}simple_stack.c:38{{(:3)?}} ({{.*}})
66// CHECK-NEXT:     #2 main{{.*}} {{.*}}simple_stack.c:44{{(:3)?}} ({{.*}})
67