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e797b466b4
mysys/array.c: Rewrite functions comments mysys/checksum.c: Rewrite function comment Style cleanup mysys/mulalloc.c: Rewrite function comment mysys/my_chsize.c: Rewrite function comment mysys/my_error.c: Rewrite comments mysys/my_once.c: Rewrite comments mysys/my_div.c: Rewrite comments mysys/my_open.c: Rewrite comments
101 lines
2.5 KiB
C
101 lines
2.5 KiB
C
/* Copyright (C) 2000 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/* Not MT-SAFE */
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#ifdef SAFEMALLOC /* We don't need SAFEMALLOC here */
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#undef SAFEMALLOC
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#endif
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#include "mysys_priv.h"
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#include "my_static.h"
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#include "mysys_err.h"
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/*
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Alloc for things we don't nead to free
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SYNOPSIS
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my_once_alloc()
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Size
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MyFlags
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NOTES
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No DBUG_ENTER... here to get smaller dbug-startup
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*/
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gptr my_once_alloc(unsigned int Size, myf MyFlags)
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{
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uint get_size,max_left;
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gptr point;
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reg1 USED_MEM *next;
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reg2 USED_MEM **prev;
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Size= ALIGN_SIZE(Size);
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prev= &my_once_root_block;
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max_left=0;
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for (next=my_once_root_block ; next && next->left < Size ; next= next->next)
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{
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if (next->left > max_left)
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max_left=next->left;
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prev= &next->next;
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}
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if (! next)
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{ /* Time to alloc new block */
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get_size= Size+ALIGN_SIZE(sizeof(USED_MEM));
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if (max_left*4 < my_once_extra && get_size < my_once_extra)
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get_size=my_once_extra; /* Normal alloc */
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if ((next = (USED_MEM*) malloc(get_size)) == 0)
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{
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my_errno=errno;
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if (MyFlags & (MY_FAE+MY_WME))
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my_error(EE_OUTOFMEMORY, MYF(ME_BELL+ME_WAITTANG),get_size);
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return((gptr) 0);
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}
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DBUG_PRINT("test",("my_once_malloc %u byte malloced",get_size));
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next->next= 0;
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next->size= get_size;
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next->left= get_size-ALIGN_SIZE(sizeof(USED_MEM));
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*prev=next;
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}
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point= (gptr) ((char*) next+ (next->size-next->left));
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next->left-= Size;
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return(point);
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} /* my_once_alloc */
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/*
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Deallocate everything used by my_once_alloc
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SYNOPSIS
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my_once_free()
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*/
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void my_once_free(void)
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{
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reg1 USED_MEM *next,*old;
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DBUG_ENTER("my_once_free");
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for (next=my_once_root_block ; next ; )
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{
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old=next; next= next->next ;
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free((gptr) old);
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}
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my_once_root_block=0;
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DBUG_VOID_RETURN;
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} /* my_once_free */
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