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Preallocate a small structure, so we can sbrk(2) further back.

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Reviewed by:	phk
Submitted by:	Kaleb Keithly <kaleb@x.org>
This commit is contained in:
Poul-Henning Kamp 1995-12-18 12:03:54 +00:00
parent 7c3efc4023
commit 9100bbac3d
1 changed files with 8 additions and 2 deletions
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10
lib/libc/stdlib/malloc.c
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@ -6,7 +6,7 @@
* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
* ----------------------------------------------------------------------------
*
* $Id: malloc.c,v 1.6 1995/10/22 14:47:00 phk Exp $
* $Id: malloc.c,v 1.7 1995/12/11 14:28:12 peter Exp $
*
*/
@ -595,6 +595,12 @@ malloc_init ()
/* Been here, done that */
initialized++;
/*
* This is a nice hack from Kaleb Keithly (kaleb@x.org).
* We can sbrk(2) further back when we keep this on a low address.
*/
px = (struct pgfree *) malloc (sizeof *px);
}
/*
@ -990,7 +996,7 @@ free_pages(void *ptr, int index, struct pginfo *info)
pf = px;
px = 0;
} else if (pf->end == ptr ) {
/* Append to the previuos entry */
/* Append to the previous entry */
pf->end += l;
pf->size += l;
if (pf->next && pf->end == pf->next->page ) {