1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 // <atomic>
10
11 // struct atomic_flag
12
13 // void atomic_flag_clear_explicit(volatile atomic_flag*, memory_order);
14 // void atomic_flag_clear_explicit(atomic_flag*, memory_order);
15
16 #include <atomic>
17 #include <cassert>
18
19 #include "test_macros.h"
20
main(int,char **)21 int main(int, char**)
22 {
23 {
24 std::atomic_flag f; // uninitialized first
25 std::atomic_flag_clear_explicit(&f, std::memory_order_relaxed);
26 assert(f.test_and_set() == 0);
27 std::atomic_flag_clear_explicit(&f, std::memory_order_relaxed);
28 assert(f.test_and_set() == 0);
29 }
30 {
31 std::atomic_flag f;
32 std::atomic_flag_clear_explicit(&f, std::memory_order_release);
33 assert(f.test_and_set() == 0);
34 std::atomic_flag_clear_explicit(&f, std::memory_order_release);
35 assert(f.test_and_set() == 0);
36 }
37 {
38 std::atomic_flag f;
39 std::atomic_flag_clear_explicit(&f, std::memory_order_seq_cst);
40 assert(f.test_and_set() == 0);
41 std::atomic_flag_clear_explicit(&f, std::memory_order_seq_cst);
42 assert(f.test_and_set() == 0);
43 }
44 {
45 volatile std::atomic_flag f;
46 std::atomic_flag_clear_explicit(&f, std::memory_order_relaxed);
47 assert(f.test_and_set() == 0);
48 std::atomic_flag_clear_explicit(&f, std::memory_order_relaxed);
49 assert(f.test_and_set() == 0);
50 }
51 {
52 volatile std::atomic_flag f;
53 std::atomic_flag_clear_explicit(&f, std::memory_order_release);
54 assert(f.test_and_set() == 0);
55 std::atomic_flag_clear_explicit(&f, std::memory_order_release);
56 assert(f.test_and_set() == 0);
57 }
58 {
59 volatile std::atomic_flag f;
60 std::atomic_flag_clear_explicit(&f, std::memory_order_seq_cst);
61 assert(f.test_and_set() == 0);
62 std::atomic_flag_clear_explicit(&f, std::memory_order_seq_cst);
63 assert(f.test_and_set() == 0);
64 }
65
66 return 0;
67 }
68