forked from OSchip/llvm-project
81 lines
2.2 KiB
C++
81 lines
2.2 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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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()
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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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}
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