mirror of
https://github.com/reactos/reactos.git
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147 lines
4.5 KiB
C++
147 lines
4.5 KiB
C++
/*
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** License Applicability. Except to the extent portions of this file are
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** made subject to an alternative license as permitted in the SGI Free
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** Software License B, Version 1.1 (the "License"), the contents of this
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** file are subject only to the provisions of the License. You may not use
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** this file except in compliance with the License. You may obtain a copy
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** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
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** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
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**
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** http://oss.sgi.com/projects/FreeB
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**
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** Note that, as provided in the License, the Software is distributed on an
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** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
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** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
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** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
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** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
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**
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** Original Code. The Original Code is: OpenGL Sample Implementation,
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** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
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** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
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** Copyright in any portions created by third parties is as indicated
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** elsewhere herein. All Rights Reserved.
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**
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** Additional Notice Provisions: The application programming interfaces
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** established by SGI in conjunction with the Original Code are The
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** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
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** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
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** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
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** Window System(R) (Version 1.3), released October 19, 1998. This software
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** was created using the OpenGL(R) version 1.2.1 Sample Implementation
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** published by SGI, but has not been independently verified as being
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** compliant with the OpenGL(R) version 1.2.1 Specification.
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*/
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/*
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* bufpool.h
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*
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* $Date$ $Revision: 1.1 $
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* $Header: /cygdrive/c/RCVS/CVS/ReactOS/reactos/lib/glu32/libnurbs/internals/bufpool.h,v 1.1 2004/02/02 16:39:11 navaraf Exp $
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*/
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#ifndef __glubufpool_h_
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#define __glubufpool_h_
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#include "gluos.h"
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#include "myassert.h"
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#include "mystdlib.h"
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#define NBLOCKS 32
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class Buffer {
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friend class Pool;
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Buffer * next; /* next buffer on free list */
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};
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class Pool {
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public:
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Pool( int, int, const char * );
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~Pool( void );
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inline void* new_buffer( void );
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inline void free_buffer( void * );
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void clear( void );
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private:
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void grow( void );
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protected:
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Buffer *freelist; /* linked list of free buffers */
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char *blocklist[NBLOCKS]; /* blocks of malloced memory */
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int nextblock; /* next free block index */
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char *curblock; /* last malloced block */
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int buffersize; /* bytes per buffer */
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int nextsize; /* size of next block of memory */
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int nextfree; /* byte offset past next free buffer */
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int initsize;
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enum Magic { is_allocated = 0xf3a1, is_free = 0xf1a2 };
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const char *name; /* name of the pool */
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Magic magic; /* marker for valid pool */
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};
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/*-----------------------------------------------------------------------------
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* Pool::free_buffer - return a buffer to a pool
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*-----------------------------------------------------------------------------
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*/
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inline void
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Pool::free_buffer( void *b )
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{
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assert( (this != 0) && (magic == is_allocated) );
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/* add buffer to singly connected free list */
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((Buffer *) b)->next = freelist;
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freelist = (Buffer *) b;
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}
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/*-----------------------------------------------------------------------------
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* Pool::new_buffer - allocate a buffer from a pool
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*-----------------------------------------------------------------------------
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*/
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inline void *
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Pool::new_buffer( void )
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{
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void *buffer;
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assert( (this != 0) && (magic == is_allocated) );
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/* find free buffer */
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if( freelist ) {
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buffer = (void *) freelist;
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freelist = freelist->next;
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} else {
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if( ! nextfree )
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grow( );
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nextfree -= buffersize;
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buffer = (void *) (curblock + nextfree);
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}
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return buffer;
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}
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class PooledObj {
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public:
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inline void * operator new( size_t, Pool & );
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inline void * operator new( size_t, void *);
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inline void * operator new( size_t s)
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{ return ::new char[s]; }
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inline void operator delete( void * ) { assert( 0 ); }
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inline void deleteMe( Pool & );
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};
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inline void *
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PooledObj::operator new( size_t, Pool& pool )
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{
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return pool.new_buffer();
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}
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inline void
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PooledObj::deleteMe( Pool& pool )
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{
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pool.free_buffer( (void *) this );
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}
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#endif /* __glubufpool_h_ */
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