| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // UNSUPPORTED: libcpp-has-no-threads |
| |
| // <atomic> |
| |
| // struct atomic_flag |
| |
| // void atomic_flag_clear_explicit(volatile atomic_flag*, memory_order); |
| // void atomic_flag_clear_explicit(atomic_flag*, memory_order); |
| |
| #include <atomic> |
| #include <cassert> |
| |
| int main(int, char**) |
| { |
| { |
| std::atomic_flag f; // uninitialized first |
| atomic_flag_clear_explicit(&f, std::memory_order_relaxed); |
| assert(f.test_and_set() == 0); |
| atomic_flag_clear_explicit(&f, std::memory_order_relaxed); |
| assert(f.test_and_set() == 0); |
| } |
| { |
| std::atomic_flag f; |
| atomic_flag_clear_explicit(&f, std::memory_order_release); |
| assert(f.test_and_set() == 0); |
| atomic_flag_clear_explicit(&f, std::memory_order_release); |
| assert(f.test_and_set() == 0); |
| } |
| { |
| std::atomic_flag f; |
| atomic_flag_clear_explicit(&f, std::memory_order_seq_cst); |
| assert(f.test_and_set() == 0); |
| atomic_flag_clear_explicit(&f, std::memory_order_seq_cst); |
| assert(f.test_and_set() == 0); |
| } |
| { |
| volatile std::atomic_flag f; |
| atomic_flag_clear_explicit(&f, std::memory_order_relaxed); |
| assert(f.test_and_set() == 0); |
| atomic_flag_clear_explicit(&f, std::memory_order_relaxed); |
| assert(f.test_and_set() == 0); |
| } |
| { |
| volatile std::atomic_flag f; |
| atomic_flag_clear_explicit(&f, std::memory_order_release); |
| assert(f.test_and_set() == 0); |
| atomic_flag_clear_explicit(&f, std::memory_order_release); |
| assert(f.test_and_set() == 0); |
| } |
| { |
| volatile std::atomic_flag f; |
| atomic_flag_clear_explicit(&f, std::memory_order_seq_cst); |
| assert(f.test_and_set() == 0); |
| atomic_flag_clear_explicit(&f, std::memory_order_seq_cst); |
| assert(f.test_and_set() == 0); |
| } |
| |
| return 0; |
| } |