135 lines
3.4 KiB
C
135 lines
3.4 KiB
C
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/* Functions for memory limit warnings.
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Copyright (C) 1990, 1992 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#ifdef emacs
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#include "config.h"
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#include "lisp.h"
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#endif
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#ifndef emacs
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#include <stddef.h>
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typedef size_t SIZE;
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typedef void *POINTER;
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#define EXCEEDS_LISP_PTR(x) 0
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#endif
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#include "mem-limits.h"
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/*
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Level number of warnings already issued.
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0 -- no warnings issued.
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1 -- 75% warning already issued.
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2 -- 85% warning already issued.
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3 -- 95% warning issued; keep warning frequently.
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*/
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static int warnlevel;
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/* Function to call to issue a warning;
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0 means don't issue them. */
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static void (*warn_function) ();
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/* Get more memory space, complaining if we're near the end. */
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static void
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check_memory_limits ()
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{
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extern POINTER (*__morecore) ();
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register POINTER cp;
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int five_percent;
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int data_size;
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if (lim_data == 0)
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get_lim_data ();
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five_percent = lim_data / 20;
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/* Find current end of memory and issue warning if getting near max */
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cp = (char *) (*__morecore) (0);
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data_size = (char *) cp - (char *) data_space_start;
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if (warn_function)
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switch (warnlevel)
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{
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case 0:
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if (data_size > five_percent * 15)
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{
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warnlevel++;
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(*warn_function) ("Warning: past 75% of memory limit");
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}
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break;
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case 1:
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if (data_size > five_percent * 17)
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{
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warnlevel++;
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(*warn_function) ("Warning: past 85% of memory limit");
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}
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break;
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case 2:
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if (data_size > five_percent * 19)
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{
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warnlevel++;
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(*warn_function) ("Warning: past 95% of memory limit");
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}
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break;
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default:
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(*warn_function) ("Warning: past acceptable memory limits");
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break;
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}
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/* If we go down below 70% full, issue another 75% warning
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when we go up again. */
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if (data_size < five_percent * 14)
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warnlevel = 0;
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/* If we go down below 80% full, issue another 85% warning
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when we go up again. */
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else if (warnlevel > 1 && data_size < five_percent * 16)
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warnlevel = 1;
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/* If we go down below 90% full, issue another 95% warning
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when we go up again. */
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else if (warnlevel > 2 && data_size < five_percent * 18)
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warnlevel = 2;
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if (EXCEEDS_LISP_PTR (cp))
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(*warn_function) ("Warning: memory in use exceeds lisp pointer size");
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}
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/* Cause reinitialization based on job parameters;
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also declare where the end of pure storage is. */
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void
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memory_warnings (start, warnfun)
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POINTER start;
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void (*warnfun) ();
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{
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extern void (* __after_morecore_hook) (); /* From gmalloc.c */
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if (start)
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data_space_start = start;
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else
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data_space_start = start_of_data ();
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warn_function = warnfun;
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__after_morecore_hook = check_memory_limits;
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}
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