90 lines
1.9 KiB
C++
90 lines
1.9 KiB
C++
/*
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* \brief Utility for synchronizing the access of interface methods
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* \author Norman Feske
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* \date 2013-05-16
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*/
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/*
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* Copyright (C) 2013-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__BASE__SYNCED_INTERFACE_H_
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#define _INCLUDE__BASE__SYNCED_INTERFACE_H_
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/* Genode includes */
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#include <base/lock.h>
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namespace Genode {
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template <typename, typename LOCK = Genode::Lock> class Synced_interface;
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}
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/*
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* Utility for synchronizing the access of interface methods
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*
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* The 'Synced_interface' utility makes the serialization of interface
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* method calls easy. The 'Synced_interface' is a functor that takes a lock
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* and a pointer to an interface as arguments. When called, the functor
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* returns a smart pointer to the interface. When this smart pointer gets
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* dereferenced, the smart pointer takes care of acquiring and releasing
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* the lock while the interface method is executed.
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*/
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template <typename IF, typename LOCK>
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class Genode::Synced_interface
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{
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public:
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class Guard
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{
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private:
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LOCK &_lock;
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IF *_interface;
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Guard(LOCK &lock, IF *interface)
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: _lock(lock), _interface(interface)
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{
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_lock.lock();
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}
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friend class Synced_interface;
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Guard &operator = (Guard const &);
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public:
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~Guard() { _lock.unlock(); }
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Guard(Guard const &other)
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: _lock(other._lock), _interface(other._interface) { }
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IF *operator -> () { return _interface; }
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};
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private:
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LOCK &_lock;
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IF *_interface;
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public:
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Synced_interface(LOCK &lock, IF *interface)
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: _lock(lock), _interface(interface) { }
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Guard operator () ()
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{
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return Guard(_lock, _interface);
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}
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Guard operator () () const
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{
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return Guard(_lock, _interface);
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}
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};
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#endif /* _INCLUDE__BASE__SYNCED_INTERFACE_H_ */
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