Commit 08327b22 authored by Gerd Moellmann's avatar Gerd Moellmann

(MMAP_ALLOCATED_P): New macro to be set from system

configuration files.
(mmap_enlarge): Enlarge mapped regions only if MMAP_ALLOCATED_P
returns 0.
parent 14404209
2002-04-16 Gerd Moellmann <gerd@gnu.org>
* buffer.c (MMAP_ALLOCATED_P): New macro to be set from system
configuration files.
(mmap_enlarge): Enlarge mapped regions only if MMAP_ALLOCATED_P
returns 0.
2002-04-15 Andreas Schwab <schwab@suse.de>
* config.in: Regenerated using autoheader.
......
/* Buffer manipulation primitives for GNU Emacs.
Copyright (C) 1985,86,87,88,89,93,94,95,97,98, 1999, 2000, 2001
Copyright (C) 1985,86,87,88,89,93,94,95,97,98, 1999, 2000, 2001, 2002
Free Software Foundation, Inc.
This file is part of GNU Emacs.
......@@ -4343,6 +4343,18 @@ static int mmap_initialized_p;
#define MEM_ALIGN sizeof (double)
/* Predicate returning true if part of the address range [START ..
END[ is currently mapped. Used to prevent overwriting an existing
memory mapping.
Default is to conservativly assume the address range is occupied by
something else. This can be overridden by system configuration
files if system-specific means to determine this exists. */
#ifndef MMAP_ALLOCATED_P
#define MMAP_ALLOCATED_P(start, end) 1
#endif
/* Function prototypes. */
static int mmap_free_1 P_ ((struct mmap_region *));
......@@ -4435,16 +4447,13 @@ mmap_enlarge (r, npages)
}
else if (npages > 0)
{
struct mmap_region *r2;
nbytes = npages * mmap_page_size;
/* Try to map additional pages at the end of the region. We
cannot do this if the address range is already occupied by
something else because mmap deletes any previous mapping.
I'm not sure this is worth doing, let's see. */
r2 = mmap_find (region_end, region_end + nbytes);
if (r2 == NULL)
if (!MMAP_ALLOCATED_P (region_end, region_end + nbytes))
{
POINTER_TYPE *p;
......
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