diff options
Diffstat (limited to 'source/blender/blenlib/intern/BLI_memarena.c')
-rw-r--r-- | source/blender/blenlib/intern/BLI_memarena.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/source/blender/blenlib/intern/BLI_memarena.c b/source/blender/blenlib/intern/BLI_memarena.c new file mode 100644 index 00000000000..596624fcc9e --- /dev/null +++ b/source/blender/blenlib/intern/BLI_memarena.c @@ -0,0 +1,80 @@ +/** + * $Id$ + * + * ***** BEGIN GPL/BL DUAL LICENSE BLOCK ***** + * + * 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. The Blender + * Foundation also sells licenses for use in proprietary software under + * the Blender License. See http://www.blender.org/BL/ for information + * about this. + * + * 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; if not, write to the Free Software Foundation, + * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV. + * All rights reserved. + * + * The Original Code is: all of this file. + * + * Contributor(s): none yet. + * + * ***** END GPL/BL DUAL LICENSE BLOCK ***** + * Efficient memory allocation for lots of similar small chunks. + */ + +#include "MEM_guardedalloc.h" + +#include "BLI_blenlib.h" +#include "BLI_memarena.h" +#include "BLI_linklist.h" + +struct MemArena { + unsigned char *curbuf; + int bufsize, cursize; + + LinkNode *bufs; +}; + +MemArena *BLI_memarena_new(int bufsize) { + MemArena *ma= MEM_callocN(sizeof(*ma), "memarena"); + ma->bufsize= bufsize; + + return ma; +} +void BLI_memarena_free(MemArena *ma) { + BLI_linklist_free(ma->bufs, MEM_freeN); + MEM_freeN(ma); +} + + /* amt must be power of two */ +#define PADUP(num, amt) ((num+(amt-1))&~(amt-1)) + +void *BLI_memarena_alloc(MemArena *ma, int size) { + void *ptr; + + /* ensure proper alignment by rounding + * size up to multiple of 8 */ + size= PADUP(size, 8); + + if (size>=ma->cursize) { + ma->cursize= (size>ma->bufsize)?size:ma->bufsize; + ma->curbuf= MEM_mallocN(ma->cursize, "ma->curbuf"); + + BLI_linklist_prepend(&ma->bufs, ma->curbuf); + } + + ptr= ma->curbuf; + ma->curbuf+= size; + ma->cursize-= size; + + return ptr; +} |