79 lines
2.4 KiB
C++
79 lines
2.4 KiB
C++
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// MIT License
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//
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// Copyright (c) 2022 Advanced Micro Devices, Inc. All Rights Reserved.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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#pragma once
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#include <atomic>
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#include <mutex>
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namespace omnitrace
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{
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namespace locking
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{
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/// simple mutex which spins on an atomic while trying to lock.
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/// Provided for internal use for when there is low contention
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/// but we want to avoid using pthread mutexes since those
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/// are wrapped by library
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struct atomic_mutex
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{
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atomic_mutex() = default;
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~atomic_mutex() = default;
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atomic_mutex(const atomic_mutex&) = delete;
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atomic_mutex(atomic_mutex&&) noexcept = delete;
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atomic_mutex& operator=(const atomic_mutex&) = delete;
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atomic_mutex& operator=(atomic_mutex&&) noexcept = delete;
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void lock();
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void unlock();
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bool try_lock();
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private:
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std::atomic<int64_t> m_value = {};
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};
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struct atomic_lock
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{
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atomic_lock(atomic_mutex&);
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atomic_lock(atomic_mutex&, std::defer_lock_t);
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~atomic_lock();
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atomic_lock(const atomic_lock&) = delete;
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atomic_lock(atomic_lock&&) noexcept = delete;
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atomic_lock& operator=(const atomic_lock&) = delete;
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atomic_lock& operator=(atomic_lock&&) noexcept = delete;
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bool owns_lock() const;
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void lock();
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void unlock();
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bool try_lock();
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private:
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bool m_owns = false;
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atomic_mutex& m_mutex;
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};
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} // namespace locking
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} // namespace omnitrace
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