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/*
* LocklessAllocator.h - allocator with lockless alloc and free
*
* Copyright (c) 2016 Javier Serrano Polo <javier@jasp.net>
*
* This file is part of LMMS - https://lmms.io
*
* 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.
*
*/
#ifndef LOCKLESS_ALLOCATOR_H
#define LOCKLESS_ALLOCATOR_H
#include <stddef.h>
#include "AtomicInt.h"
class LocklessAllocator
{
public:
LocklessAllocator( size_t nmemb, size_t size );
virtual ~LocklessAllocator();
void * alloc();
void free( void * ptr );
private:
char * m_pool;
size_t m_capacity;
size_t m_elementSize;
AtomicInt * m_freeState;
size_t m_freeStateSets;
AtomicInt m_available;
AtomicInt m_startIndex;
} ;
template<typename T>
class LocklessAllocatorT : private LocklessAllocator
{
public:
LocklessAllocatorT( size_t nmemb ) :
LocklessAllocator( nmemb, sizeof( T ) )
{
}
virtual ~LocklessAllocatorT()
{
}
T * alloc()
{
return (T *)LocklessAllocator::alloc();
}
void free( T * ptr )
{
LocklessAllocator::free( ptr );
}
} ;
#endif
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