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Diffstat (limited to 'src/glu/sgi/libnurbs/internals/bufpool.h')
| -rw-r--r-- | src/glu/sgi/libnurbs/internals/bufpool.h | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/src/glu/sgi/libnurbs/internals/bufpool.h b/src/glu/sgi/libnurbs/internals/bufpool.h new file mode 100644 index 00000000000..f7f46655cf1 --- /dev/null +++ b/src/glu/sgi/libnurbs/internals/bufpool.h @@ -0,0 +1,145 @@ +/* +** License Applicability. Except to the extent portions of this file are +** made subject to an alternative license as permitted in the SGI Free +** Software License B, Version 1.1 (the "License"), the contents of this +** file are subject only to the provisions of the License. You may not use +** this file except in compliance with the License. You may obtain a copy +** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600 +** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at: +** +** http://oss.sgi.com/projects/FreeB +** +** Note that, as provided in the License, the Software is distributed on an +** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS +** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND +** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A +** PARTICULAR PURPOSE, AND NON-INFRINGEMENT. +** +** Original Code. The Original Code is: OpenGL Sample Implementation, +** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics, +** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc. +** Copyright in any portions created by third parties is as indicated +** elsewhere herein. All Rights Reserved. +** +** Additional Notice Provisions: The application programming interfaces +** established by SGI in conjunction with the Original Code are The +** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released +** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version +** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X +** Window System(R) (Version 1.3), released October 19, 1998. This software +** was created using the OpenGL(R) version 1.2.1 Sample Implementation +** published by SGI, but has not been independently verified as being +** compliant with the OpenGL(R) version 1.2.1 Specification. +*/ + +/* + * bufpool.h + * + * $Date: 2001/03/17 00:25:40 $ $Revision: 1.1 $ + * $Header: /home/krh/git/sync/mesa-cvs-repo/Mesa/src/glu/sgi/libnurbs/internals/bufpool.h,v 1.1 2001/03/17 00:25:40 brianp Exp $ + */ + +#ifndef __glubufpool_h_ +#define __glubufpool_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, 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 }; + 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 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_ */ |