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/*
* SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
* Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice including the dates of first publication and
* either this permission notice or a reference to
* http://oss.sgi.com/projects/FreeB/
* shall be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Except as contained in this notice, the name of Silicon Graphics, Inc.
* shall not be used in advertising or otherwise to promote the sale, use or
* other dealings in this Software without prior written authorization from
* Silicon Graphics, Inc.
*/
/*
* bufpool.h
*
*/
#ifndef __glubufpool_h_
#define __glubufpool_h_
#include "gluos.h"
#include "myassert.h"
#include "mystdlib.h"
#define NBLOCKS 32
class Buffer {
friend class Pool;
Buffer * next; /* next buffer on free list */
};
class Pool {
public:
Pool( int, int, const char * );
~Pool( void );
inline void* new_buffer( void );
inline void free_buffer( void * );
void clear( void );
private:
void grow( void );
protected:
Buffer *freelist; /* linked list of free buffers */
char *blocklist[NBLOCKS]; /* blocks of malloced memory */
int nextblock; /* next free block index */
char *curblock; /* last malloced block */
int buffersize; /* bytes per buffer */
int nextsize; /* size of next block of memory */
int nextfree; /* byte offset past next free buffer */
int initsize;
enum Magic { is_allocated = 0xf3a1, is_free = 0xf1a2 };
const char *name; /* name of the pool */
Magic magic; /* marker for valid pool */
};
/*-----------------------------------------------------------------------------
* Pool::free_buffer - return a buffer to a pool
*-----------------------------------------------------------------------------
*/
inline void
Pool::free_buffer( void *b )
{
assert( (this != 0) && (magic == is_allocated) );
/* add buffer to singly connected free list */
((Buffer *) b)->next = freelist;
freelist = (Buffer *) b;
}
/*-----------------------------------------------------------------------------
* Pool::new_buffer - allocate a buffer from a pool
*-----------------------------------------------------------------------------
*/
inline void *
Pool::new_buffer( void )
{
void *buffer;
assert( (this != 0) && (magic == is_allocated) );
/* find free buffer */
if( freelist ) {
buffer = (void *) freelist;
freelist = freelist->next;
} else {
if( ! nextfree )
grow( );
nextfree -= buffersize;;
buffer = (void *) (curblock + nextfree);
}
return buffer;
}
class PooledObj {
public:
inline void * operator new( size_t, Pool & );
inline void * operator new( size_t, void *);
inline void * operator new( size_t s)
{ return ::new char[s]; }
inline void operator delete( void * ) { assert( 0 ); }
inline void operator delete( void *, Pool & ) { assert( 0 ); }
inline void deleteMe( Pool & );
};
inline void *
PooledObj::operator new( size_t, Pool& pool )
{
return pool.new_buffer();
}
inline void
PooledObj::deleteMe( Pool& pool )
{
pool.free_buffer( (void *) this );
}
#endif /* __glubufpool_h_ */
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