pike.git/ src/ block_alloc.h

Branch: Tag:

2006-01-24

2006-01-24 07:32:22 by Martin Stjernholm <mast@lysator.liu.se>

Added some data structure doc.

Rev: src/block_alloc.h:1.78

2:   || This file is part of Pike. For copyright information see COPYRIGHT.   || Pike is distributed under GPL, LGPL and MPL. See the file COPYING   || for more information. - || $Id: block_alloc.h,v 1.77 2005/04/09 10:54:25 grubba Exp $ + || $Id: block_alloc.h,v 1.78 2006/01/24 07:32:22 mast Exp $   */      #undef PRE_INIT_BLOCK
30:   #define COUNT_OTHER()   #define DMALLOC_DESCRIBE_BLOCK(X)   #define BLOCK_ALLOC_HSIZE_SHIFT 2 - #define MAX_EMPTY_BLOCKS 4 + #define MAX_EMPTY_BLOCKS 4 /* Must be >= 1. */      #ifndef BLOCK_ALLOC_USED   #define BLOCK_ALLOC_USED DO_IF_DMALLOC(real_used) DO_IF_NOT_DMALLOC(used)
104:   }; \    \   static struct PIKE_CONCAT(DATA,_context) *PIKE_CONCAT(DATA,_ctxs)=0; \ +  \ + /* Points to a double linked list of the meta-blocks. */ \ + /* Full meta-blocks are last on this list. */ \   static struct PIKE_CONCAT(DATA,_block) *PIKE_CONCAT(DATA,_blocks)=0; \ -  +  \ + /* Points to the last meta-block in the DATA,_block list that isn't full. */ \   static struct PIKE_CONCAT(DATA,_block) *PIKE_CONCAT(DATA,_free_blocks)= \    (void*)-1; \ -  +  \   static INT32 PIKE_CONCAT3(num_empty_,DATA,_blocks)=0; \   DO_IF_RUN_UNLOCKED(static PIKE_MUTEX_T PIKE_CONCAT(DATA,_mutex);) \   DO_IF_DMALLOC( \
307:    if(!--blk->BLOCK_ALLOC_USED && \    ++PIKE_CONCAT3(num_empty_,DATA,_blocks) > MAX_EMPTY_BLOCKS) { \    if(blk == PIKE_CONCAT(DATA,_free_blocks)) { \ +  /* blk->prev isn't NULL because MAX_EMPTY_BLOCKS >= 1 so we */ \ +  /* know there's at least one more empty block. */ \    if((blk->prev->next = blk->next)) \    blk->next->prev = blk->prev; \    PIKE_CONCAT(DATA,_free_blocks) = blk->prev; \