1 // RUN: %clang_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
2 #include "test.h"
3
4 int Global;
5
foo1()6 void __attribute__((noinline)) foo1() {
7 Global = 42;
8 }
9
bar1()10 void __attribute__((noinline)) bar1() {
11 volatile int tmp = 42; (void)tmp;
12 foo1();
13 }
14
foo2()15 void __attribute__((noinline)) foo2() {
16 volatile int v = Global; (void)v;
17 }
18
bar2()19 void __attribute__((noinline)) bar2() {
20 volatile int tmp = 42; (void)tmp;
21 foo2();
22 }
23
Thread1(void * x)24 void *Thread1(void *x) {
25 barrier_wait(&barrier);
26 bar1();
27 return NULL;
28 }
29
Thread2(void * x)30 void *Thread2(void *x) {
31 bar2();
32 barrier_wait(&barrier);
33 return NULL;
34 }
35
StartThread(pthread_t * t,void * (* f)(void *))36 void StartThread(pthread_t *t, void *(*f)(void*)) {
37 pthread_create(t, NULL, f, NULL);
38 }
39
main()40 int main() {
41 barrier_init(&barrier, 2);
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:7{{(:10)?}} ({{.*}})
53 // CHECK-NEXT: #1 bar1{{.*}} {{.*}}simple_stack.c:12{{(:3)?}} ({{.*}})
54 // CHECK-NEXT: #2 Thread1{{.*}} {{.*}}simple_stack.c:26{{(:3)?}} ({{.*}})
55 // CHECK: Previous read of size 4 at {{.*}} by thread T2:
56 // CHECK-NEXT: #0 foo2{{.*}} {{.*}}simple_stack.c:16{{(:20)?}} ({{.*}})
57 // CHECK-NEXT: #1 bar2{{.*}} {{.*}}simple_stack.c:21{{(:3)?}} ({{.*}})
58 // CHECK-NEXT: #2 Thread2{{.*}} {{.*}}simple_stack.c:31{{(: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:37{{(: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:37{{(:3)?}} ({{.*}})
66 // CHECK-NEXT: #2 main{{.*}} {{.*}}simple_stack.c:44{{(:3)?}} ({{.*}})
67