mirror of
https://github.com/RGBCube/serenity
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c40780d404
This class was previously a spinlock that would call sys$donate() to donate its timeslice to whichever thread was holding the lock. Now that pthread_mutex_t has a fast path, let's implement Lock on top of that instead and get rid of the last remaining user of sys$donate().
81 lines
1.3 KiB
C++
81 lines
1.3 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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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/Assertions.h>
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#include <AK/Types.h>
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#include <pthread.h>
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namespace Threading {
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class Lock {
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public:
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Lock() { }
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~Lock() { }
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void lock();
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void unlock();
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private:
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pthread_mutex_t m_mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
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};
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class Locker {
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public:
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ALWAYS_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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ALWAYS_INLINE ~Locker() { unlock(); }
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ALWAYS_INLINE void unlock() { m_lock.unlock(); }
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ALWAYS_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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ALWAYS_INLINE void Lock::lock()
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{
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pthread_mutex_lock(&m_mutex);
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}
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inline void Lock::unlock()
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{
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pthread_mutex_unlock(&m_mutex);
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}
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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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template<typename... Args>
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Lockable(Args&&... args)
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: m_resource(forward(args)...)
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{
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}
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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 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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