1// RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
2#include "test.h"
3
4const int kTestCount = 4;
5typedef long long T;
6T atomics[kTestCount * 2];
7
8void Test(int test, T *p, bool main_thread) {
9 volatile T sink;
10 if (test == 0) {
11 if (main_thread)
12 __atomic_fetch_add(p, 1, __ATOMIC_RELAXED);
13 else
14 __atomic_fetch_add(p, 1, __ATOMIC_RELAXED);
15 } else if (test == 1) {
16 if (main_thread)
17 __atomic_exchange_n(p, 1, __ATOMIC_ACQ_REL);
18 else
19 __atomic_exchange_n(p, 1, __ATOMIC_ACQ_REL);
20 } else if (test == 2) {
21 if (main_thread)
22 sink = __atomic_load_n(p, __ATOMIC_SEQ_CST);
23 else
24 __atomic_store_n(p, 1, __ATOMIC_SEQ_CST);
25 } else if (test == 3) {
26 if (main_thread)
27 sink = __atomic_load_n(p, __ATOMIC_SEQ_CST);
28 else
29 sink = *p;
30 }
31}
32
33void *Thread(void *p) {
34 for (int i = 0; i < kTestCount; i++) {
35 Test(test: i, p: &atomics[i], main_thread: false);
36 }
37 barrier_wait(barrier: &barrier);
38 barrier_wait(barrier: &barrier);
39 for (int i = 0; i < kTestCount; i++) {
40 fprintf(stderr, format: "Test %d reverse\n", i);
41 Test(test: i, p: &atomics[kTestCount + i], main_thread: false);
42 }
43 return 0;
44}
45
46int main() {
47 barrier_init(barrier: &barrier, count: 2);
48 pthread_t t;
49 pthread_create(newthread: &t, attr: 0, start_routine: Thread, arg: 0);
50 barrier_wait(barrier: &barrier);
51 for (int i = 0; i < kTestCount; i++) {
52 fprintf(stderr, format: "Test %d\n", i);
53 Test(test: i, p: &atomics[i], main_thread: true);
54 }
55 for (int i = 0; i < kTestCount; i++) {
56 Test(test: i, p: &atomics[kTestCount + i], main_thread: true);
57 }
58 barrier_wait(barrier: &barrier);
59 pthread_join(th: t, thread_return: 0);
60}
61
62// CHECK-NOT: ThreadSanitizer: data race
63

source code of compiler-rt/test/tsan/atomic_norace.cpp