1 /* Functions for memory limit warnings.
2 Copyright (C) 1990, 1992 Free Software Foundation, Inc.
4 This file is part of XEmacs.
6 XEmacs is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by the
8 Free Software Foundation; either version 2, or (at your option) any
11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with XEmacs; see the file COPYING. If not, write to
18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
21 /* Synched up with: FSF 19.30. */
31 typedef void *POINTER;
32 #define EXCEEDS_LISP_PTR(x) 0
35 #include "mem-limits.h"
38 Level number of warnings already issued.
39 0 -- no warnings issued.
40 1 -- 75% warning already issued.
41 2 -- 85% warning already issued.
42 3 -- 95% warning issued; keep warning frequently.
46 /* Function to call to issue a warning;
47 0 means don't issue them. */
48 static void (*warn_function) (const char *);
50 /* Get more memory space, complaining if we're near the end. */
53 check_memory_limits (void)
55 extern POINTER (*__morecore) (ptrdiff_t size);
58 unsigned long five_percent;
59 unsigned long data_size;
60 void (*save_warn_fun) (const char *);
64 five_percent = lim_data / 20;
66 /* Find current end of memory and issue warning if getting near max */
67 cp = (char *) (*__morecore) (0);
68 data_size = (char *) cp - (char *) data_space_start;
72 /* temporarily reset the warn_function to 0 or we will get infinite
74 save_warn_fun = warn_function;
79 if (data_size > five_percent * 15)
82 (*save_warn_fun) ("Warning: past 75% of memory limit");
87 if (data_size > five_percent * 17)
90 (*save_warn_fun) ("Warning: past 85% of memory limit");
95 if (data_size > five_percent * 19)
98 (*save_warn_fun) ("Warning: past 95% of memory limit");
103 (*save_warn_fun) ("Warning: past acceptable memory limits");
106 warn_function = save_warn_fun;
109 /* If we go down below 70% full, issue another 75% warning
110 when we go up again. */
111 if (data_size < five_percent * 14)
113 /* If we go down below 80% full, issue another 85% warning
114 when we go up again. */
115 else if (warnlevel > 1 && data_size < five_percent * 16)
117 /* If we go down below 90% full, issue another 95% warning
118 when we go up again. */
119 else if (warnlevel > 2 && data_size < five_percent * 18)
122 if (EXCEEDS_LISP_PTR (cp))
126 /* temporarily reset the warn_function to 0 or we will get infinite
128 save_warn_fun = warn_function;
131 ("Warning: memory in use exceeds lisp pointer size");
132 warn_function = save_warn_fun;
137 /* Cause reinitialization based on job parameters;
138 also declare where the end of pure storage is. */
141 memory_warnings (void *start, void (*warnfun) (const char *))
143 extern void (* __after_morecore_hook) (void); /* From gmalloc.c */
146 data_space_start = (char*) start;
148 data_space_start = start_of_data ();
150 #ifndef _NO_MALLOC_WARNING_
151 warn_function = warnfun;
152 __after_morecore_hook = check_memory_limits;