ladybird/Userland/Libraries/LibThreading/Mutex.h

/*
 * Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#pragma once

#include <AK/Assertions.h>
#include <AK/Noncopyable.h>
#include <AK/Types.h>
#include <pthread.h>

namespace Threading {

class Mutex {
    AK_MAKE_NONCOPYABLE(Mutex);
    AK_MAKE_NONMOVABLE(Mutex);
    friend class ConditionVariable;

public:
    Mutex()
    {
#ifndef __serenity__
        pthread_mutexattr_t attr;
        pthread_mutexattr_init(&attr);
        pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
        pthread_mutex_init(&m_mutex, &attr);
#endif
    }
    ~Mutex() = default;

    void lock();
    void unlock();

private:
#ifdef __serenity__
    pthread_mutex_t m_mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
#else
    pthread_mutex_t m_mutex;
#endif
};

class MutexLocker {
    AK_MAKE_NONCOPYABLE(MutexLocker);
    AK_MAKE_NONMOVABLE(MutexLocker);

public:
    ALWAYS_INLINE explicit MutexLocker(Mutex& mutex)
        : m_mutex(mutex)
    {
        lock();
    }
    ALWAYS_INLINE ~MutexLocker() { unlock(); }
    ALWAYS_INLINE void unlock() { m_mutex.unlock(); }
    ALWAYS_INLINE void lock() { m_mutex.lock(); }

private:
    Mutex& m_mutex;
};

ALWAYS_INLINE void Mutex::lock()
{
    pthread_mutex_lock(&m_mutex);
}

ALWAYS_INLINE void Mutex::unlock()
{
    pthread_mutex_unlock(&m_mutex);
}

}