28 lines
713 B
C++
28 lines
713 B
C++
// Copyright (c) Charles J. Cliffe
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// SPDX-License-Identifier: GPL-2.0+
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#pragma once
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#include <atomic>
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// A non-recursive Mutex implemented as a spin-lock, implementing the Lockable requirement
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class SpinMutex {
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public:
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SpinMutex() = default;
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SpinMutex(const SpinMutex&) = delete;
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SpinMutex& operator=(const SpinMutex&) = delete;
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~SpinMutex() { lock_state.clear(std::memory_order_release); }
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void lock() { while (lock_state.test_and_set(std::memory_order_acquire)); }
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bool try_lock() {return !lock_state.test_and_set(std::memory_order_acquire); }
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void unlock() { lock_state.clear(std::memory_order_release); }
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private:
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std::atomic_flag lock_state = ATOMIC_FLAG_INIT;
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};
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