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MutexProtected mirrors the identically-named Kernel primitive and can be used to synchronize access to any object that might not be thread safe on its own. Synchronization is done with a simple mutex, so access to a MutexProtected object is potentially blocking. Mutex now has an internal nesting variable which is there to harden it against lock-unlock ordering issues (e.g. double unlocking).
56 lines
1.2 KiB
C++
56 lines
1.2 KiB
C++
/*
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* Copyright (c) 2022, kleines Filmröllchen <malu.bertsch@gmail.com>.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Concepts.h>
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#include <AK/Noncopyable.h>
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#include <LibThreading/Mutex.h>
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namespace Threading {
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template<typename T>
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class MutexProtected {
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AK_MAKE_NONCOPYABLE(MutexProtected);
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AK_MAKE_NONMOVABLE(MutexProtected);
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using ProtectedType = T;
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public:
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ALWAYS_INLINE MutexProtected() = default;
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ALWAYS_INLINE MutexProtected(T&& value)
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: m_value(move(value))
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{
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}
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ALWAYS_INLINE explicit MutexProtected(T& value)
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: m_value(value)
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{
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}
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template<typename Callback>
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decltype(auto) with_locked(Callback callback)
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{
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auto lock = this->lock();
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// This allows users to get a copy, but if we don't allow references through &m_value, it's even more complex.
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return callback(m_value);
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}
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template<VoidFunction<T> Callback>
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void for_each_locked(Callback callback)
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{
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with_locked([&](auto& value) {
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for (auto& item : value)
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callback(item);
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});
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}
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private:
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[[nodiscard]] ALWAYS_INLINE MutexLocker lock() { return MutexLocker(m_lock); }
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T m_value;
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Mutex m_lock {};
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};
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}
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