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Merge work:/home/bk/mysql-4.0 into hundin.mysql.fi:/my/bk/mysql-4.0

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monty@hundin.mysql.fi 2002-06-27 14:16:44 +03:00
commit ddc8c5403e
2 changed files with 43 additions and 20 deletions
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7
include/my_alloc.h
View File

@ -21,6 +21,8 @@
#ifndef _my_alloc_h
#define _my_alloc_h
#define MAX_BLOCK_USAGE_BEFORE_DROP 10
typedef struct st_used_mem
{ /* struct for once_alloc (block) */
struct st_used_mem *next; /* Next block in use */
@ -38,6 +40,11 @@ typedef struct st_mem_root
unsigned int min_malloc;
unsigned int block_size; /* initial block size */
unsigned int block_num; /* allocated blocks counter */
/*
first free block in queue test counter (if it exceed
MAX_BLOCK_USAGE_BEFORE_DROP block will be droped in 'used' list)
*/
unsigned int first_block_usage;
void (*error_handler)(void);
} MEM_ROOT;

20
mysys/my_alloc.c
View File

@ -30,6 +30,7 @@ void init_alloc_root(MEM_ROOT *mem_root, uint block_size,
mem_root->block_size= block_size-MALLOC_OVERHEAD-sizeof(USED_MEM)-8;
mem_root->error_handler= 0;
mem_root->block_num= 0;
mem_root->first_block_usage= 0;
#if !(defined(HAVE_purify) && defined(EXTRA_DEBUG))
if (pre_alloc_size)
{
@ -64,13 +65,24 @@ gptr alloc_root(MEM_ROOT *mem_root,unsigned int Size)
#else
uint get_size, block_size;
gptr point;
reg1 USED_MEM *next;
reg1 USED_MEM *next= 0;
reg2 USED_MEM **prev;
Size= ALIGN_SIZE(Size);
prev= &mem_root->free;
if ( (*(prev= &mem_root->free)) != NULL )
{
if( (*prev)->left < Size &&
mem_root->first_block_usage++ >= MAX_BLOCK_USAGE_BEFORE_DROP )
{
next= *prev;
*prev= next->next; /* Remove block from list */
next->next= mem_root->used;
mem_root->used= next;
mem_root->first_block_usage= 0;
}
for (next= *prev ; next && next->left < Size ; next= next->next)
prev= &next->next;
}
if (! next)
{ /* Time to alloc new block */
block_size= mem_root->block_size*((mem_root->block_num>>2)+1);
@ -89,12 +101,15 @@ gptr alloc_root(MEM_ROOT *mem_root,unsigned int Size)
next->left= get_size-ALIGN_SIZE(sizeof(USED_MEM));
*prev=next;
}
point= (gptr) ((char*) next+ (next->size-next->left));
/*TODO: next part may be unneded due to mem_root->first_block_usage counter*/
if ((next->left-= Size) < mem_root->min_malloc)
{ /* Full block */
*prev= next->next; /* Remove block from list */
next->next= mem_root->used;
mem_root->used= next;
mem_root->first_block_usage= 0;
}
return(point);
#endif
@ -166,6 +181,7 @@ void free_root(MEM_ROOT *root, myf MyFlags)
}
else
root->block_num= 0;
root->first_block_usage= 0;
DBUG_VOID_RETURN;
}