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