/* Functions for memory limit warnings. Copyright (C) 1990, 1992, 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc. This file is part of GNU Emacs. GNU Emacs is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. GNU Emacs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GNU Emacs; see the file COPYING. If not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ #ifdef emacs #include #include "lisp.h" #endif #ifndef emacs #include typedef size_t SIZE; typedef void *POINTER; #define EXCEEDS_LISP_PTR(x) 0 #endif #include "mem-limits.h" #ifdef HAVE_GETRLIMIT #include #endif /* Level number of warnings already issued. 0 -- no warnings issued. 1 -- 75% warning already issued. 2 -- 85% warning already issued. 3 -- 95% warning issued; keep warning frequently. */ enum warnlevel { not_warned, warned_75, warned_85, warned_95 }; static enum warnlevel warnlevel; /* Function to call to issue a warning; 0 means don't issue them. */ static void (*warn_function) (); /* Start of data space; can be changed by calling malloc_init. */ static POINTER data_space_start; /* Number of bytes of writable memory we can expect to be able to get. */ static unsigned long lim_data; #ifdef NO_LIM_DATA static void get_lim_data () { lim_data = -1; } #else /* not NO_LIM_DATA */ #ifdef USG static void get_lim_data () { extern long ulimit (); lim_data = -1; /* Use the ulimit call, if we seem to have it. */ #if !defined (ULIMIT_BREAK_VALUE) || defined (GNU_LINUX) lim_data = ulimit (3, 0); #endif /* If that didn't work, just use the macro's value. */ #ifdef ULIMIT_BREAK_VALUE if (lim_data == -1) lim_data = ULIMIT_BREAK_VALUE; #endif lim_data -= (long) data_space_start; } #else /* not USG */ #ifdef WINDOWSNT static void get_lim_data () { extern unsigned long reserved_heap_size; lim_data = reserved_heap_size; } #else #if !defined (BSD4_2) && !defined (__osf__) #ifdef MSDOS void get_lim_data () { _go32_dpmi_meminfo info; _go32_dpmi_get_free_memory_information (&info); lim_data = info.available_memory; } #else /* not MSDOS */ static void get_lim_data () { lim_data = vlimit (LIM_DATA, -1); } #endif /* not MSDOS */ #else /* BSD4_2 */ static void get_lim_data () { struct rlimit XXrlimit; getrlimit (RLIMIT_DATA, &XXrlimit); #ifdef RLIM_INFINITY lim_data = XXrlimit.rlim_cur & RLIM_INFINITY; /* soft limit */ #else lim_data = XXrlimit.rlim_cur; /* soft limit */ #endif } #endif /* BSD4_2 */ #endif /* not WINDOWSNT */ #endif /* not USG */ #endif /* not NO_LIM_DATA */ /* Verify amount of memory available, complaining if we're near the end. */ static void check_memory_limits () { #ifdef REL_ALLOC extern POINTER (*real_morecore) (); #endif extern POINTER (*__morecore) (); register POINTER cp; unsigned long five_percent; unsigned long data_size; enum warnlevel new_warnlevel; #ifdef HAVE_GETRLIMIT struct rlimit rlimit; getrlimit (RLIMIT_AS, &rlimit); if (RLIM_INFINITY == rlimit.rlim_max) return; /* This is a nonsensical case, but it happens -- rms. */ if (rlimit.rlim_cur > rlimit.rlim_max) return; five_percent = rlimit.rlim_max / 20; data_size = rlimit.rlim_cur; #else /* not HAVE_GETRLIMIT */ if (lim_data == 0) get_lim_data (); five_percent = lim_data / 20; /* Find current end of memory and issue warning if getting near max */ #ifdef REL_ALLOC if (real_morecore) cp = (char *) (*real_morecore) (0); else #endif cp = (char *) (*__morecore) (0); data_size = (char *) cp - (char *) data_space_start; #endif /* not HAVE_GETRLIMIT */ if (!warn_function) return; /* What level of warning does current memory usage demand? */ if (data_size > five_percent * 19) new_warnlevel = warned_95; else if (data_size > five_percent * 17) new_warnlevel = warned_85; else if (data_size > five_percent * 15) new_warnlevel = warned_75; else new_warnlevel = not_warned; /* If we have gone up a level, give the appropriate warning. */ if (new_warnlevel > warnlevel || new_warnlevel == warned_95) { warnlevel = new_warnlevel; switch (warnlevel) { case warned_75: (*warn_function) ("Warning: past 75% of memory limit"); break; case warned_85: (*warn_function) ("Warning: past 85% of memory limit"); break; case warned_95: (*warn_function) ("Warning: past 95% of memory limit"); } } /* Handle going down in usage levels, with some hysteresis. */ else { /* If we go down below 70% full, issue another 75% warning when we go up again. */ if (data_size < five_percent * 14) warnlevel = not_warned; /* If we go down below 80% full, issue another 85% warning when we go up again. */ else if (warnlevel > warned_75 && data_size < five_percent * 16) warnlevel = warned_75; /* If we go down below 90% full, issue another 95% warning when we go up again. */ else if (warnlevel > warned_85 && data_size < five_percent * 18) warnlevel = warned_85; } if (EXCEEDS_LISP_PTR (cp)) (*warn_function) ("Warning: memory in use exceeds lisp pointer size"); } /* Enable memory usage warnings. START says where the end of pure storage is. WARNFUN specifies the function to call to issue a warning. */ void memory_warnings (start, warnfun) POINTER start; void (*warnfun) (); { extern void (* __after_morecore_hook) (); /* From gmalloc.c */ if (start) data_space_start = start; else data_space_start = start_of_data (); warn_function = warnfun; __after_morecore_hook = check_memory_limits; /* Force data limit to be recalculated on each run. */ lim_data = 0; } /* arch-tag: eab04eda-1f69-447a-8d9f-95f0a3983ca5 (do not change this comment) */