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/* | ||
* MemoryManager.h - A lightweight, generic memory manager for LMMS | ||
* | ||
* Copyright (c) 2014 Vesa Kivimäki | ||
* Copyright (c) 2007-2014 Tobias Doerffel <tobydox/at/users.sourceforge.net> | ||
* | ||
* This file is part of Linux MultiMedia Studio - http://lmms.sourceforge.net | ||
* | ||
* This program is free software; you can redistribute it and/or | ||
* modify it under the terms of the GNU General Public | ||
* License as published by the Free Software Foundation; either | ||
* version 2 of the License, or (at your option) any later version. | ||
* | ||
* This program is distributed in the hope that it will be useful, | ||
* but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
* General Public License for more details. | ||
* | ||
* You should have received a copy of the GNU General Public | ||
* License along with this program (see COPYING); if not, write to the | ||
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, | ||
* Boston, MA 02110-1301 USA. | ||
* | ||
*/ | ||
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#ifndef MEMORY_MANAGER_H | ||
#define MEMORY_MANAGER_H | ||
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#include <new> | ||
#include <QtCore/QVector> | ||
#include <QtCore/QMutex> | ||
#include <QtCore/QMap> | ||
#include "MemoryHelper.h" | ||
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const int MM_CHUNK_SIZE = 64; // granularity of managed memory | ||
const int MM_INITIAL_CHUNKS = 1024 * 1024; // how many chunks to allocate at startup - TODO: make configurable | ||
const int MM_INCREMENT_CHUNKS = 16 * 1024; // min. amount of chunks to increment at a time | ||
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struct MemoryPool | ||
{ | ||
void * m_pool; | ||
char * m_free; | ||
int m_chunks; | ||
QMutex m_mutex; | ||
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MemoryPool() : | ||
m_pool( NULL ), | ||
m_free( NULL ), | ||
m_chunks( 0 ) | ||
{} | ||
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MemoryPool( int chunks ) : | ||
m_chunks( chunks ) | ||
{ | ||
m_free = (char*) MemoryHelper::alignedMalloc( chunks ); | ||
memset( m_free, 1, chunks ); | ||
} | ||
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MemoryPool( const MemoryPool & mp ) : | ||
m_pool( mp.m_pool ), | ||
m_free( mp.m_free ), | ||
m_chunks( mp.m_chunks ), | ||
m_mutex() | ||
{} | ||
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MemoryPool & operator = ( const MemoryPool & mp ) | ||
{ | ||
m_pool = mp.m_pool; | ||
m_free = mp.m_free; | ||
m_chunks = mp.m_chunks; | ||
return *this; | ||
} | ||
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void * getChunks( int chunksNeeded ); | ||
void releaseChunks( void * ptr, int chunks ); | ||
}; | ||
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struct PtrInfo | ||
{ | ||
int chunks; | ||
MemoryPool * memPool; | ||
}; | ||
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typedef QVector<MemoryPool> MemoryPoolVector; | ||
typedef QMap<void*, PtrInfo> PointerInfoMap; | ||
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class MemoryManager | ||
{ | ||
public: | ||
static bool init(); | ||
static void * alloc( size_t size ); | ||
static void free( void * ptr ); | ||
static int extend( int chunks ); // returns index of created pool (for use by alloc) | ||
static void cleanup(); | ||
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private: | ||
static MemoryPoolVector s_memoryPools; | ||
static QMutex s_poolMutex; | ||
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static PointerInfoMap s_pointerInfo; | ||
static QMutex s_pointerMutex; | ||
}; | ||
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#define MM_OPERATORS \ | ||
public: \ | ||
static void * operator new ( size_t size ) \ | ||
{ \ | ||
return MemoryManager::alloc( size ); \ | ||
} \ | ||
static void * operator new[] ( size_t size ) \ | ||
{ \ | ||
return MemoryManager::alloc( size ); \ | ||
} \ | ||
static void operator delete ( void * ptr ) \ | ||
{ \ | ||
MemoryManager::free( ptr ); \ | ||
} \ | ||
static void operator delete[] ( void * ptr ) \ | ||
{ \ | ||
MemoryManager::free( ptr ); \ | ||
} | ||
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// for use in cases where overriding new/delete isn't a possibility | ||
#define MM_ALLOC( type, count ) (type*) MemoryManager::alloc( sizeof( type ) * count ) | ||
// and just for symmetry... | ||
#define MM_FREE( ptr ) MemoryManager::free( ptr ) | ||
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#endif |
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