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// Copyright 2025 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include <atomic>
namespace Common
{
namespace detail
{
template <bool UseAtomicWait>
class AtomicMutexBase
{
public:
void lock()
{
while (m_lock.exchange(true, std::memory_order_acquire))
{
if constexpr (UseAtomicWait)
m_lock.wait(true, std::memory_order_relaxed);
}
}
bool try_lock()
{
bool expected = false;
return m_lock.compare_exchange_weak(expected, true, std::memory_order_acquire,
std::memory_order_relaxed);
}
// Unlike with std::mutex, this call may come from any thread.
void unlock()
{
m_lock.store(false, std::memory_order_release);
if constexpr (UseAtomicWait)
m_lock.notify_one();
}
private:
std::atomic_bool m_lock{};
};
} // namespace detail
// Sometimes faster than std::mutex.
using AtomicMutex = detail::AtomicMutexBase<true>;
// Very fast to lock and unlock when uncontested (~3x faster than std::mutex).
using SpinMutex = detail::AtomicMutexBase<false>;
} // namespace Common
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