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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
MA 02111-1301, USA */
/* Not MT-SAFE */
#ifdef SAFEMALLOC /* We don't need SAFEMALLOC here */
#undef SAFEMALLOC
#endif
#include "mysys_priv.h"
#include "my_static.h"
#include "mysys_err.h"
/* alloc for things we don't nead to free */
/* No DBUG_ENTER... here to get smaller dbug-startup */
gptr my_once_alloc(unsigned int Size, myf MyFlags)
{
size_t get_size,max_left;
gptr point;
reg1 USED_MEM *next;
reg2 USED_MEM **prev;
Size= ALIGN_SIZE(Size);
prev= &my_once_root_block;
max_left=0;
for (next=my_once_root_block ; next && next->left < Size ; next= next->next)
{
if (next->left > max_left)
max_left=next->left;
prev= &next->next;
}
if (! next)
{ /* Time to alloc new block */
get_size= Size+ALIGN_SIZE(sizeof(USED_MEM));
if (max_left*4 < my_once_extra && get_size < my_once_extra)
get_size=my_once_extra; /* Normal alloc */
if ((next = (USED_MEM*) malloc(get_size)) == 0)
{
my_errno=errno;
if (MyFlags & (MY_FAE+MY_WME))
my_error(EE_OUTOFMEMORY, MYF(ME_BELL+ME_WAITTANG),get_size);
return((gptr) 0);
}
DBUG_PRINT("test",("my_once_malloc %u byte malloced",get_size));
next->next= 0;
next->size= get_size;
next->left= get_size-ALIGN_SIZE(sizeof(USED_MEM));
*prev=next;
}
point= (gptr) ((char*) next+ (next->size-next->left));
next->left-= Size;
return(point);
} /* my_once_alloc */
/* deallocate everything used by my_once_alloc */
void my_once_free(void)
{
reg1 USED_MEM *next,*old;
DBUG_ENTER("my_once_free");
for (next=my_once_root_block ; next ; )
{
old=next; next= next->next ;
free((gptr) old);
}
my_once_root_block=0;
DBUG_VOID_RETURN;
} /* my_once_free */
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