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140 lines
3.6 KiB
140 lines
3.6 KiB
// -*- Mode: C++; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
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// vim:tabstop=4:shiftwidth=4:expandtab:
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/*
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* Copyright (C) 2004-2008 Wu Yongwei <adah at users dot sourceforge dot net>
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any
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* damages arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute
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* it freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must
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* not claim that you wrote the original software. If you use this
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* software in a product, an acknowledgement in the product
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* documentation would be appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must
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* not be misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source
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* distribution.
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*
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* This file is part of Stones of Nvwa:
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* http://sourceforge.net/projects/nvwa
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*
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*/
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/*!
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* \file class_level_lock.h
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* \ingroup QxMemLeak
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*
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* In essence Loki ClassLevelLockable re-engineered to use a fast_mutex class.
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*
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* \version 1.13, 2007/12/30
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* \author Wu Yongwei
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*
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*/
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#ifndef QT_NO_DEBUG
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#ifndef _QX_MODE_RELEASE
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#if _QX_USE_MEM_LEAK_DETECTION
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#ifndef _CLASS_LEVEL_LOCK_H
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#define _CLASS_LEVEL_LOCK_H
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#ifdef _MSC_VER
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#pragma once
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#endif
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#include "fast_mutex.h"
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namespace qx {
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namespace memory {
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#ifdef _NOTHREADS
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/**
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* Helper class for class-level locking. This is the
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* single-threaded implementation.
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*/
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template <class _Host, bool _RealLock = false>
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class class_level_lock
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{
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public:
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/** Type that provides locking/unlocking semantics. */
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class lock
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{
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public:
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lock() {}
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};
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typedef _Host volatile_type;
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};
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#else
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/**
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* Helper class for class-level locking. This is the multi-threaded
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* implementation. The main departure from Loki ClassLevelLockable
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* is that there is an additional template parameter which can make
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* the lock not lock at all even in multi-threaded environments.
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* See static_mem_pool.h for real usage.
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*/
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template <class _Host, bool _RealLock = true>
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class class_level_lock
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{
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static fast_mutex _S_mtx;
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public:
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class lock;
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friend class lock;
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/** Type that provides locking/unlocking semantics. */
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class lock
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{
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lock(const lock&);
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lock& operator=(const lock&);
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public:
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lock()
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{
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if (_RealLock)
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_S_mtx.lock();
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}
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~lock()
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{
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if (_RealLock)
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_S_mtx.unlock();
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}
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};
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typedef volatile _Host volatile_type;
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};
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#if HAVE_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION
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/** Partial specialization that makes null locking. */
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template <class _Host>
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class class_level_lock<_Host, false>
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{
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public:
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/** Type that provides locking/unlocking semantics. */
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class lock
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{
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public:
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lock() {}
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};
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typedef _Host volatile_type;
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};
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#endif // HAVE_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION
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template <class _Host, bool _RealLock>
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fast_mutex class_level_lock<_Host, _RealLock>::_S_mtx;
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#endif // _NOTHREADS
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} // namespace memory
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} // namespace qx
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#endif // _CLASS_LEVEL_LOCK_H
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#endif // _QX_USE_MEM_LEAK_DETECTION
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#endif // _QX_MODE_RELEASE
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#endif // QT_NO_DEBUG
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