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266 lines
6.2 KiB
C
266 lines
6.2 KiB
C
/* Functions for memory limit warnings.
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Copyright (C) 1990, 1992, 2001, 2002, 2003, 2004,
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2005, 2006, 2007, 2008 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 3, 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, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, 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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#ifdef HAVE_GETRLIMIT
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#include <sys/resource.h>
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#endif
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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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enum warnlevel { not_warned, warned_75, warned_85, warned_95 };
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static enum warnlevel 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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/* Start of data space; can be changed by calling malloc_init. */
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static POINTER data_space_start;
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/* Number of bytes of writable memory we can expect to be able to get. */
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static unsigned long lim_data;
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#ifdef NO_LIM_DATA
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static void
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get_lim_data ()
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{
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lim_data = -1;
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}
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#else /* not NO_LIM_DATA */
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#ifdef USG
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static void
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get_lim_data ()
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{
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extern long ulimit ();
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lim_data = -1;
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/* Use the ulimit call, if we seem to have it. */
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#if !defined (ULIMIT_BREAK_VALUE) || defined (GNU_LINUX)
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lim_data = ulimit (3, 0);
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#endif
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/* If that didn't work, just use the macro's value. */
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#ifdef ULIMIT_BREAK_VALUE
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if (lim_data == -1)
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lim_data = ULIMIT_BREAK_VALUE;
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#endif
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lim_data -= (long) data_space_start;
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}
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#else /* not USG */
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#ifdef WINDOWSNT
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static void
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get_lim_data ()
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{
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extern unsigned long reserved_heap_size;
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lim_data = reserved_heap_size;
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}
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#else
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#if !defined (BSD4_2) && !defined (__osf__)
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#ifdef MSDOS
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void
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get_lim_data ()
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{
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_go32_dpmi_meminfo info;
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_go32_dpmi_get_free_memory_information (&info);
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lim_data = info.available_memory;
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}
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#else /* not MSDOS */
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static void
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get_lim_data ()
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{
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lim_data = vlimit (LIM_DATA, -1);
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}
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#endif /* not MSDOS */
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#else /* BSD4_2 */
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static void
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get_lim_data ()
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{
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struct rlimit XXrlimit;
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getrlimit (RLIMIT_DATA, &XXrlimit);
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#ifdef RLIM_INFINITY
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lim_data = XXrlimit.rlim_cur & RLIM_INFINITY; /* soft limit */
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#else
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lim_data = XXrlimit.rlim_cur; /* soft limit */
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#endif
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}
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#endif /* BSD4_2 */
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#endif /* not WINDOWSNT */
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#endif /* not USG */
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#endif /* not NO_LIM_DATA */
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/* Verify amount of memory available, 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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#ifdef REL_ALLOC
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extern POINTER (*real_morecore) ();
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#endif
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extern POINTER (*__morecore) ();
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register POINTER cp;
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unsigned long five_percent;
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unsigned long data_size;
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enum warnlevel new_warnlevel;
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#ifdef HAVE_GETRLIMIT
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struct rlimit rlimit;
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getrlimit (RLIMIT_AS, &rlimit);
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if (RLIM_INFINITY == rlimit.rlim_max)
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return;
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/* This is a nonsensical case, but it happens -- rms. */
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if (rlimit.rlim_cur > rlimit.rlim_max)
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return;
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five_percent = rlimit.rlim_max / 20;
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data_size = rlimit.rlim_cur;
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#else /* not HAVE_GETRLIMIT */
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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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#ifdef REL_ALLOC
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if (real_morecore)
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cp = (char *) (*real_morecore) (0);
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else
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#endif
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cp = (char *) (*__morecore) (0);
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data_size = (char *) cp - (char *) data_space_start;
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#endif /* not HAVE_GETRLIMIT */
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if (!warn_function)
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return;
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/* What level of warning does current memory usage demand? */
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if (data_size > five_percent * 19)
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new_warnlevel = warned_95;
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else if (data_size > five_percent * 17)
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new_warnlevel = warned_85;
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else if (data_size > five_percent * 15)
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new_warnlevel = warned_75;
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else
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new_warnlevel = not_warned;
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/* If we have gone up a level, give the appropriate warning. */
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if (new_warnlevel > warnlevel || new_warnlevel == warned_95)
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{
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warnlevel = new_warnlevel;
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switch (warnlevel)
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{
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case warned_75:
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(*warn_function) ("Warning: past 75% of memory limit");
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break;
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case warned_85:
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(*warn_function) ("Warning: past 85% of memory limit");
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break;
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case warned_95:
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(*warn_function) ("Warning: past 95% of memory limit");
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}
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}
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/* Handle going down in usage levels, with some hysteresis. */
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else
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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 = not_warned;
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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 > warned_75 && data_size < five_percent * 16)
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warnlevel = warned_75;
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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 > warned_85 && data_size < five_percent * 18)
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warnlevel = warned_85;
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}
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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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/* Enable memory usage warnings.
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START says where the end of pure storage is.
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WARNFUN specifies the function to call to issue a warning. */
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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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/* Force data limit to be recalculated on each run. */
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lim_data = 0;
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}
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/* arch-tag: eab04eda-1f69-447a-8d9f-95f0a3983ca5
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(do not change this comment) */
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