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117 lines
2.7 KiB
C
117 lines
2.7 KiB
C
/* Functions for memory limit warnings.
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Copyright (C) 1990 Free Software Foundation, Inc.
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This file is part of GNU Emacs.
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GNU Emacs 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 1, or (at your option)
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any later version.
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GNU Emacs 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 GNU Emacs; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "config.h"
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#include "lisp.h"
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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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*/
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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 (*warnfunction) ();
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extern POINTER sbrk ();
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/* Get more memory space, complaining if we're near the end. */
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static POINTER
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morecore_with_warning (size)
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register int size;
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{
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POINTER result;
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register POINTER cp;
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register unsigned int siz;
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if (!data_space_start)
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{
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data_space_start = start_of_data ();
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}
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if (lim_data == 0)
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get_lim_data ();
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/* Find current end of memory and issue warning if getting near max */
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cp = sbrk (0);
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siz = cp - data_space_start;
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if (warnfunction)
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switch (warnlevel)
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{
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case 0:
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if (siz > (lim_data / 4) * 3)
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{
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warnlevel++;
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(*warnfunction) ("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 (siz > (lim_data / 20) * 17)
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{
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warnlevel++;
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(*warnfunction) ("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 (siz > (lim_data / 20) * 19)
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{
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warnlevel++;
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(*warnfunction) ("Warning: past 95% of memory limit");
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}
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break;
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default:
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(*warnfunction) ("Warning: past acceptable memory limits");
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break;
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}
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if (EXCEEDS_ELISP_PTR (cp))
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(*warnfunction) ("Warning: memory in use exceeds lisp pointer size");
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result = sbrk (size);
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if (result == (POINTER) -1)
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return NULL;
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return result;
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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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malloc_init (start, warnfun)
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POINTER start;
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void (*warnfun) ();
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{
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extern POINTER (* __morecore) (); /* From gmalloc.c */
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if (start)
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data_space_start = start;
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lim_data = 0;
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warnlevel = 0;
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warnfunction = warnfun;
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__morecore = &morecore_with_warning;
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}
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