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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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37 /*
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38 Level number of warnings already issued.
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39 0 -- no warnings issued.
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40 1 -- 75% warning already issued.
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41 2 -- 85% warning already issued.
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42 3 -- 95% warning issued; keep warning frequently.
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43 */
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44 static int warnlevel;
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45
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46 /* Function to call to issue a warning;
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47 0 means don't issue them. */
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48 static void (*warn_function) (CONST char *);
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49
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50 /* Get more memory space, complaining if we're near the end. */
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51
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52 static void
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53 check_memory_limits (void)
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54 {
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55 extern POINTER (*__morecore) (ptrdiff_t size);
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56
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57 POINTER cp;
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58 unsigned long five_percent;
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59 unsigned long data_size;
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60
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61 if (lim_data == 0)
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62 get_lim_data ();
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63 five_percent = lim_data / 20;
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64
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65 /* Find current end of memory and issue warning if getting near max */
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66 cp = (char *) (*__morecore) (0);
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67 data_size = (char *) cp - (char *) data_space_start;
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68
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69 if (warn_function)
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70 switch (warnlevel)
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71 {
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72 case 0:
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73 if (data_size > five_percent * 15)
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74 {
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75 warnlevel++;
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76 (*warn_function) ("Warning: past 75% of memory limit");
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77 }
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78 break;
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79
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80 case 1:
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81 if (data_size > five_percent * 17)
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82 {
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83 warnlevel++;
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84 (*warn_function) ("Warning: past 85% 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 2:
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89 if (data_size > five_percent * 19)
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90 {
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91 warnlevel++;
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92 (*warn_function) ("Warning: past 95% of memory limit");
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93 }
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94 break;
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95
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96 default:
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97 (*warn_function) ("Warning: past acceptable memory limits");
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98 break;
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99 }
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100
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101 /* If we go down below 70% full, issue another 75% warning
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102 when we go up again. */
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103 if (data_size < five_percent * 14)
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104 warnlevel = 0;
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105 /* If we go down below 80% full, issue another 85% warning
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106 when we go up again. */
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107 else if (warnlevel > 1 && data_size < five_percent * 16)
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108 warnlevel = 1;
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109 /* If we go down below 90% full, issue another 95% warning
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110 when we go up again. */
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111 else if (warnlevel > 2 && data_size < five_percent * 18)
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112 warnlevel = 2;
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113
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114 if (EXCEEDS_LISP_PTR (cp))
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115 (*warn_function) ("Warning: memory in use exceeds lisp pointer size");
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116 }
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117
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118 /* Cause reinitialization based on job parameters;
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119 also declare where the end of pure storage is. */
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120
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121 void
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122 memory_warnings (void *start, void (*warnfun) (CONST char *))
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123 {
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124 extern void (* __after_morecore_hook) (void); /* From gmalloc.c */
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125
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126 if (start)
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127 data_space_start = start;
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128 else
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129 data_space_start = start_of_data ();
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130
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131 #ifndef _NO_MALLOC_WARNING_
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132 warn_function = warnfun;
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133 __after_morecore_hook = check_memory_limits;
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134 #endif
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135 }
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