Mercurial > hg > xemacs-beta
annotate src/mem-limits.h @ 5366:f00192e1cd49
Examining the result of #'length: `eql', not `=', it's better style & cheaper
2011-03-08 Aidan Kehoe <kehoea@parhasard.net>
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It's better style, and cheaper (often one assembler instruction
vs. a C funcall in the byte code), to use `eql' instead of `='
when it's clear what numerical type a given result will be. Change
much of our code to do this, with the help of a byte-compiler
change (not comitted) that looked for calls to #'length (which
always returns an integer) in its args.
| author | Aidan Kehoe <kehoea@parhasard.net> |
|---|---|
| date | Tue, 08 Mar 2011 23:41:52 +0000 |
| parents | 702b5727498a |
| children | 308d34e9f07d |
| rev | line source |
|---|---|
| 428 | 1 /* Includes for memory limit warnings. |
| 2 Copyright (C) 1990, 1992, 1993, 1994, 1995 Free Software Foundation, Inc. | |
| 3 | |
| 4 This file is part of XEmacs. | |
| 5 | |
| 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 | |
| 9 later version. | |
| 10 | |
| 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 | |
| 14 for more details. | |
| 15 | |
| 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. */ | |
| 20 | |
| 21 /* Synched up with: FSF 19.30. */ | |
| 22 | |
| 2263 | 23 /* Subsequently cleaned up and reorganised, made to use configure. */ |
| 428 | 24 |
| 440 | 25 #ifndef INCLUDED_mem_limits_h_ |
| 26 #define INCLUDED_mem_limits_h_ | |
| 428 | 27 |
| 28 #ifdef HAVE_CONFIG_H | |
| 29 #include <config.h> | |
| 30 #endif | |
| 31 | |
| 32 #ifdef HAVE_ULIMIT_H | |
| 33 #include <ulimit.h> | |
| 34 #endif | |
| 35 | |
| 2263 | 36 #ifdef HAVE_SYS_RESOURCE_H |
| 37 /* Some systems need either sys/types.h or sys/time.h before <sys/resource.h>. */ | |
| 428 | 38 #include <sys/types.h> |
| 2263 | 39 #include <sys/time.h> |
| 40 #include <sys/resource.h> | |
| 41 #endif | |
| 42 | |
| 43 #ifdef HAVE_SYS_VLIMIT_H | |
| 44 #include <sys/vlimit.h> | |
| 45 #endif | |
| 428 | 46 |
| 47 #ifdef _LIBC | |
| 48 | |
| 49 /* Old Linux startup code won't define __data_start. */ | |
| 50 extern int etext, __data_start; weak_symbol (__data_start) | |
| 51 #define start_of_data() (&__data_start ?: &etext) | |
| 52 | |
| 53 #else /* not GNU libc */ | |
| 54 | |
| 55 #ifdef emacs | |
| 56 typedef void *POINTER; | |
| 57 | |
| 442 | 58 #ifndef CYGWIN |
| 428 | 59 typedef unsigned long SIZE; |
| 60 #endif | |
| 61 | |
| 62 extern POINTER start_of_data (void); | |
| 63 #define EXCEEDS_LISP_PTR(ptr) 0 | |
| 64 | |
| 65 #ifdef BSD | |
| 66 extern int etext; | |
| 67 #define start_of_data() &etext | |
| 68 #endif | |
| 69 | |
| 70 #else /* not emacs */ | |
| 71 extern char etext; | |
| 72 #define start_of_data() &etext | |
| 73 #endif /* not emacs */ | |
| 74 | |
| 75 #endif /* not _LIBC */ | |
| 76 | |
| 77 | |
| 78 | |
| 79 /* start of data space; can be changed by calling malloc_init */ | |
| 80 static POINTER data_space_start; | |
| 81 | |
| 82 /* Number of bytes of writable memory we can expect to be able to get */ | |
| 2132 | 83 extern unsigned long lim_data; |
| 428 | 84 |
| 2263 | 85 /* The implementation of get_lim_data() is very machine dependent. */ |
| 86 | |
| 442 | 87 #if defined (HEAP_IN_DATA) && !defined(PDUMP) |
| 428 | 88 extern unsigned long static_heap_size; |
| 1632 | 89 extern MODULE_API int initialized; |
| 2263 | 90 |
| 428 | 91 static void |
| 92 get_lim_data (void) | |
| 93 { | |
| 94 if (!initialized) | |
| 95 { | |
| 2132 | 96 lim_data = (unsigned long) -1; /* static_heap_size; */ |
| 428 | 97 } |
| 98 else | |
| 99 { | |
| 2132 | 100 lim_data = (unsigned long) -1; |
| 428 | 101 } |
| 102 } | |
| 2263 | 103 |
| 104 #elif defined(NO_LIM_DATA) | |
| 105 | |
| 428 | 106 static void |
| 107 get_lim_data (void) | |
| 108 { | |
| 2132 | 109 lim_data = (unsigned long) -1; |
| 428 | 110 } |
| 2263 | 111 |
| 112 #elif defined(HAVE_GETRLIMIT) | |
| 113 | |
| 114 static void | |
| 115 get_lim_data (void) | |
| 116 { | |
| 117 struct rlimit XXrlimit; | |
| 428 | 118 |
| 2263 | 119 getrlimit (RLIMIT_DATA, &XXrlimit); |
| 120 #ifdef RLIM_INFINITY | |
| 121 lim_data = XXrlimit.rlim_cur & RLIM_INFINITY; /* soft limit */ | |
| 122 #else | |
| 123 lim_data = XXrlimit.rlim_cur; /* soft limit */ | |
| 124 #endif | |
| 125 } | |
| 126 | |
| 127 #elif defined(HAVE_ULIMIT) | |
| 428 | 128 |
| 129 static void | |
| 130 get_lim_data (void) | |
| 131 { | |
| 2132 | 132 lim_data = (unsigned long) -1; |
| 428 | 133 |
| 134 /* Use the ulimit call, if we seem to have it. */ | |
| 2132 | 135 #if !defined (ULIMIT_BREAK_VALUE) |
| 428 | 136 lim_data = ulimit (3, 0); |
| 137 #endif | |
| 138 | |
| 139 /* If that didn't work, just use the macro's value. */ | |
| 140 #ifdef ULIMIT_BREAK_VALUE | |
| 2132 | 141 if (lim_data == (unsigned long) -1) |
| 428 | 142 lim_data = ULIMIT_BREAK_VALUE; |
| 143 #endif | |
| 144 | |
| 145 lim_data -= (long) data_space_start; | |
| 146 } | |
| 147 | |
| 2263 | 148 #elif defined(WIN32_NATIVE) |
| 428 | 149 |
| 150 static void | |
| 151 get_lim_data (void) | |
| 152 { | |
| 153 extern unsigned long data_region_size; | |
| 154 lim_data = data_region_size; | |
| 155 } | |
| 156 | |
| 2263 | 157 #elif defined(HAVE_VLIMIT) |
| 428 | 158 |
| 159 static void | |
| 160 get_lim_data (void) | |
| 161 { | |
| 162 lim_data = vlimit (LIM_DATA, -1); | |
| 163 } | |
| 164 | |
| 165 #else | |
| 2263 | 166 #error Cannot determine an implementation of get_lim_data(). |
| 167 #endif /* not HAVE_VLIMIT */ | |
| 428 | 168 |
| 440 | 169 #endif /* INCLUDED_mem_limits_h_ */ |