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https://github.com/RGBCube/serenity
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c7104e7512
ConditionVariable is a thin wrapper over the pthread_cond_* APIs, just as Mutex is a wrapper over pthread_mutex. Because ConditionVariable might want to wait on a high-level Mutex, it needs to be friends with it.
66 lines
1.2 KiB
C++
66 lines
1.2 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 Mutex {
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friend class ConditionVariable;
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public:
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Mutex()
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{
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#ifndef __serenity__
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pthread_mutexattr_t attr;
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pthread_mutexattr_init(&attr);
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pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
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pthread_mutex_init(&m_mutex, &attr);
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#endif
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}
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~Mutex() { }
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void lock();
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void unlock();
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private:
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#ifdef __serenity__
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pthread_mutex_t m_mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
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#else
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pthread_mutex_t m_mutex;
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#endif
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};
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class MutexLocker {
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public:
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ALWAYS_INLINE explicit MutexLocker(Mutex& mutex)
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: m_mutex(mutex)
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{
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lock();
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}
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ALWAYS_INLINE ~MutexLocker() { unlock(); }
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ALWAYS_INLINE void unlock() { m_mutex.unlock(); }
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ALWAYS_INLINE void lock() { m_mutex.lock(); }
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private:
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Mutex& m_mutex;
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};
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ALWAYS_INLINE void Mutex::lock()
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{
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pthread_mutex_lock(&m_mutex);
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}
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ALWAYS_INLINE void Mutex::unlock()
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{
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pthread_mutex_unlock(&m_mutex);
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}
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}
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