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428
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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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793
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37 #ifndef _NO_MALLOC_WARNING_
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38
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428
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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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442
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50 static void (*warn_function) (const char *);
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428
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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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442
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62 void (*save_warn_fun) (const char *);
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428
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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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442
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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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428
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87
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442
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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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428
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95
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442
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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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428
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103
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442
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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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428
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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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442
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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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428
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137 }
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138
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793
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139 #endif /* not _NO_MALLOC_WARNING_ */
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140
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428
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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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442
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145 memory_warnings (void *start, void (*warnfun) (const char *))
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428
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146 {
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793
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147 #ifndef _NO_MALLOC_WARNING_
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428
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148 extern void (* __after_morecore_hook) (void); /* From gmalloc.c */
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793
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149 #endif
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428
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150
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151 if (start)
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442
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152 data_space_start = (char*) start;
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428
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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 }
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