mirror of
https://github.com/RGBCube/serenity
synced 2025-05-29 20:35:13 +00:00
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++
/*
|
|
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/Assertions.h>
|
|
#include <AK/Types.h>
|
|
#include <pthread.h>
|
|
|
|
namespace Threading {
|
|
|
|
class Lock {
|
|
public:
|
|
Lock() { }
|
|
~Lock() { }
|
|
|
|
void lock();
|
|
void unlock();
|
|
|
|
private:
|
|
pthread_mutex_t m_mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
|
|
};
|
|
|
|
class Locker {
|
|
public:
|
|
ALWAYS_INLINE explicit Locker(Lock& l)
|
|
: m_lock(l)
|
|
{
|
|
lock();
|
|
}
|
|
ALWAYS_INLINE ~Locker() { unlock(); }
|
|
ALWAYS_INLINE void unlock() { m_lock.unlock(); }
|
|
ALWAYS_INLINE void lock() { m_lock.lock(); }
|
|
|
|
private:
|
|
Lock& m_lock;
|
|
};
|
|
|
|
ALWAYS_INLINE void Lock::lock()
|
|
{
|
|
pthread_mutex_lock(&m_mutex);
|
|
}
|
|
|
|
inline void Lock::unlock()
|
|
{
|
|
pthread_mutex_unlock(&m_mutex);
|
|
}
|
|
|
|
template<typename T>
|
|
class Lockable {
|
|
public:
|
|
Lockable() { }
|
|
|
|
template<typename... Args>
|
|
Lockable(Args&&... args)
|
|
: m_resource(forward(args)...)
|
|
{
|
|
}
|
|
|
|
Lockable(T&& resource)
|
|
: m_resource(move(resource))
|
|
{
|
|
}
|
|
Lock& lock() { return m_lock; }
|
|
T& resource() { return m_resource; }
|
|
|
|
T lock_and_copy()
|
|
{
|
|
Locker locker(m_lock);
|
|
return m_resource;
|
|
}
|
|
|
|
private:
|
|
T m_resource;
|
|
Lock m_lock;
|
|
};
|
|
|
|
}
|