annotate src/vm-limit.c @ 844:047d37eb70d7

[xemacs-hg @ 2002-05-16 13:30:23 by ben] ui fixes for things that were bothering me bytecode.c, editfns.c, lisp.h, lread.c: Fix save-restriction to use markers rather than pseudo-markers (integers representing the amount of text on either side of the region). That way, all inserts are handled correctly, not just those inside old restriction. Add buffer argument to save_restriction_save(). process.c: Clean up very dirty and kludgy code that outputs into a buffer -- use proper unwind protects, etc. font-lock.c: Do save-restriction/widen around the function -- otherwise, incorrect results will ensue when a buffer has been narrowed before a call to e.g. `buffer-syntactic-context' -- something that happens quite often. fileio.c: Look for a handler for make-temp-name. window.c, winslots.h: Try to solve this annoying problem: have two frames displaying the buffer, in different places; in one, temporarily switch away to another buffer and then back -- and you've lost your position; it's reset to the other one in the other frame. My current solution involves window-level caches of buffers and points (also a cache for window-start); when set-window-buffer is called, it looks to see if the buffer was previously visited in the window, and if so, uses the most recent point at that time. (It's a marker, so it handles changes.) #### Note: It could be argued that doing it on the frame level would be better -- e.g. if you visit a buffer temporarily through a grep, and then go back to that buffer, you presumably want the grep's position rather than some previous position provided everything was in the same frame, even though the grep was in another window in the frame. However, doing it on the frame level fails when you have two windows on the same frame. Perhaps we keep both a window and a frame cache, and use the frame cache if there are no other windows on the frame showing the buffer, else the window's cache? This is probably something to be configurable using a specifier. Suggestions please please please? window.c: Clean up a bit code that deals with the annoyance of window-point vs. point. dialog.el: Function to ask a multiple-choice question, automatically choosing a dialog box or minibuffer representation as necessary. Generalized version of yes-or-no-p, y-or-n-p. files.el: Use get-user-response to ask "yes/no/diff" question when recovering. "diff" means that a diff is displayed between the current file and the autosave. (Converts/deconverts escape-quoted as necessary. No more complaints from you, Mr. Turnbull!) One known problem: when a dialog is used, it's modal, so you can't scroll the diff. Will fix soon. lisp-mode.el: If we're filling a string, don't treat semicolon as a comment, which would give very unfriendly results. Uses `buffer-syntactic-context'. simple.el: all changes back to the beginning. (Useful if you've saved the file in the middle of the changes.) simple.el: Add option kill-word-into-kill-ring, which controls whether words deleted with kill-word, backward-kill-word, etc. are "cut" into the kill ring, or "cleared" into nothingness. (My preference is the latter, by far. I'd almost go so far as suggesting we make it the default, as you can always select a word and then cut it if you want it cut.) menubar-items.el: Add option corresponding to kill-word-into-kill-ring.
author ben
date Thu, 16 May 2002 13:30:58 +0000
parents e38acbeb1cae
children 04bc9d2f42c7
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1 /* Functions for memory limit warnings.
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2 Copyright (C) 1990, 1992 Free Software Foundation, Inc.
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3
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4 This file is part of XEmacs.
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5
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6 XEmacs is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by the
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8 Free Software Foundation; either version 2, or (at your option) any
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9 later version.
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10
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11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with XEmacs; see the file COPYING. If not, write to
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18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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19 Boston, MA 02111-1307, USA. */
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20
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21 /* Synched up with: FSF 19.30. */
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22
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23 #ifdef emacs
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24 #include <config.h>
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25 #include "lisp.h"
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26 #endif
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27
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28 #include <stddef.h>
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29 #ifndef emacs
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30 typedef size_t SIZE;
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31 typedef void *POINTER;
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32 #define EXCEEDS_LISP_PTR(x) 0
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33 #endif
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34
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35 #include "mem-limits.h"
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36
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37 #ifndef _NO_MALLOC_WARNING_
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38
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39 /*
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40 Level number of warnings already issued.
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41 0 -- no warnings issued.
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42 1 -- 75% warning already issued.
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43 2 -- 85% warning already issued.
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44 3 -- 95% warning issued; keep warning frequently.
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45 */
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46 static int warnlevel;
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47
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48 /* Function to call to issue a warning;
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49 0 means don't issue them. */
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50 static void (*warn_function) (const char *);
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51
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52 /* Get more memory space, complaining if we're near the end. */
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53
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54 static void
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55 check_memory_limits (void)
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56 {
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57 extern POINTER (*__morecore) (ptrdiff_t size);
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58
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59 POINTER cp;
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60 unsigned long five_percent;
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61 unsigned long data_size;
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62 void (*save_warn_fun) (const char *);
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63
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64 if (lim_data == 0)
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65 get_lim_data ();
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66 five_percent = lim_data / 20;
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67
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68 /* Find current end of memory and issue warning if getting near max */
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69 cp = (char *) (*__morecore) (0);
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70 data_size = (char *) cp - (char *) data_space_start;
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71
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72 if (warn_function)
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73 {
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74 /* temporarily reset the warn_function to 0 or we will get infinite
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75 looping. */
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76 save_warn_fun = warn_function;
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77 warn_function = 0;
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78 switch (warnlevel)
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79 {
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80 case 0:
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81 if (data_size > five_percent * 15)
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82 {
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83 warnlevel++;
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84 (*save_warn_fun) ("Warning: past 75% of memory limit");
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85 }
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86 break;
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87
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88 case 1:
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89 if (data_size > five_percent * 17)
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90 {
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91 warnlevel++;
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92 (*save_warn_fun) ("Warning: past 85% of memory limit");
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93 }
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94 break;
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95
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96 case 2:
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97 if (data_size > five_percent * 19)
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98 {
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99 warnlevel++;
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100 (*save_warn_fun) ("Warning: past 95% of memory limit");
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101 }
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102 break;
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103
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104 default:
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105 (*save_warn_fun) ("Warning: past acceptable memory limits");
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106 break;
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107 }
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108 warn_function = save_warn_fun;
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109 }
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110
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111 /* If we go down below 70% full, issue another 75% warning
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112 when we go up again. */
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113 if (data_size < five_percent * 14)
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114 warnlevel = 0;
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115 /* If we go down below 80% full, issue another 85% warning
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116 when we go up again. */
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117 else if (warnlevel > 1 && data_size < five_percent * 16)
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118 warnlevel = 1;
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119 /* If we go down below 90% full, issue another 95% warning
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120 when we go up again. */
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121 else if (warnlevel > 2 && data_size < five_percent * 18)
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122 warnlevel = 2;
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123
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124 if (EXCEEDS_LISP_PTR (cp))
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125 {
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126 if (warn_function)
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127 {
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128 /* temporarily reset the warn_function to 0 or we will get infinite
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129 looping. */
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130 save_warn_fun = warn_function;
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131 warn_function = 0;
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132 (*save_warn_fun)
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133 ("Warning: memory in use exceeds lisp pointer size");
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134 warn_function = save_warn_fun;
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135 }
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136 }
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137 }
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138
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139 #endif /* not _NO_MALLOC_WARNING_ */
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140
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141 /* Cause reinitialization based on job parameters;
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142 also declare where the end of pure storage is. */
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143
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144 void
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145 memory_warnings (void *start, void (*warnfun) (const char *))
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146 {
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147 #ifndef _NO_MALLOC_WARNING_
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148 extern void (* __after_morecore_hook) (void); /* From gmalloc.c */
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149 #endif
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150
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151 if (start)
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152 data_space_start = (char*) start;
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153 else
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154 data_space_start = start_of_data ();
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155
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156 #ifndef _NO_MALLOC_WARNING_
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157 warn_function = warnfun;
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158 __after_morecore_hook = check_memory_limits;
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159 #endif
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160 }