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102 lines
2.8 KiB
C++
102 lines
2.8 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/Assertions.h>
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#include <AK/Atomic.h>
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#include <AK/Types.h>
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#include <Kernel/Arch/i386/CPU.h>
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#include <Kernel/Forward.h>
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#include <Kernel/WaitQueue.h>
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namespace Kernel {
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extern Thread* current;
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class Lock {
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public:
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Lock(const char* name = nullptr)
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: m_name(name)
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{
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}
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~Lock() {}
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void lock();
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void unlock();
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bool force_unlock_if_locked();
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bool is_locked() const { return m_holder; }
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const char* name() const { return m_name; }
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private:
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Atomic<bool> m_lock { false };
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u32 m_level { 0 };
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Thread* m_holder { nullptr };
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const char* m_name { nullptr };
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WaitQueue m_queue;
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};
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class Locker {
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public:
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[[gnu::always_inline]] inline explicit Locker(Lock& l)
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: m_lock(l)
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{
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lock();
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}
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[[gnu::always_inline]] inline ~Locker() { unlock(); }
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[[gnu::always_inline]] inline void unlock() { m_lock.unlock(); }
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[[gnu::always_inline]] inline void lock() { m_lock.lock(); }
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private:
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Lock& m_lock;
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};
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#define LOCKER(lock) Locker locker(lock)
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template<typename T>
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class Lockable {
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public:
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Lockable() {}
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Lockable(T&& resource)
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: m_resource(move(resource))
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{
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}
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Lock& lock() { return m_lock; }
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T& resource() { return m_resource; }
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T lock_and_copy()
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{
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LOCKER(m_lock);
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return m_resource;
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}
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private:
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T m_resource;
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Lock m_lock;
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};
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}
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