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209
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1 ;;; itimer.el --- Interval timers for XEmacs
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2
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3 ;; Copyright (C) 1988, 1991, 1993, 1997 Kyle E. Jones
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4
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5 ;; Author: Kyle Jones <kyle_jones@wonderworks.com>
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6 ;; Keywords: internal, dumped
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7
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8 ;; This file is part of XEmacs.
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9
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10 ;; XEmacs is free software; you can redistribute it and/or modify it
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11 ;; under the terms of the GNU General Public License as published by
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12 ;; the Free Software Foundation; either version 2, or (at your option)
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13 ;; any later version.
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14
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15 ;; XEmacs is distributed in the hope that it will be useful, but
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16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18 ;; General Public License for more details.
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19
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20 ;; You should have received a copy of the GNU General Public License
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21 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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22 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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23 ;; 02111-1307, USA.
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24
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25 ;;; Synched up with: Not in FSF
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26
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27 ;;; Commentary:
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28
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29 ;; This file is dumped with XEmacs.
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30
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31 ;; Send bug reports to kyle_jones@wonderworks.com
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32
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33 ;;; Code:
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34
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35 (provide 'itimer)
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36
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37 ;; `itimer' feature means Emacs-Lisp programmers get:
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38 ;; itimerp
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39 ;; itimer-live-p
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40 ;; itimer-value
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41 ;; itimer-restart
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42 ;; itimer-function
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43 ;; itimer-uses-arguments
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44 ;; itimer-function-arguments
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45 ;; set-itimer-value
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46 ;; set-itimer-restart
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47 ;; set-itimer-function
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48 ;; set-itimer-uses-arguments
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49 ;; set-itimer-function-arguments
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50 ;; get-itimer
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51 ;; start-itimer
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52 ;; read-itimer
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53 ;; delete-itimer
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54 ;; activate-itimer
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55 ;;
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56 ;; Interactive users get these commands:
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57 ;; edit-itimers
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58 ;; list-itimers
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59 ;; start-itimer
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60 ;;
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61 ;; See the doc strings of these functions for more information.
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62
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63 (defvar itimer-version "1.06"
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64 "Version number of the itimer package.")
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65
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66 (defvar itimer-list nil
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67 "List of all active itimers.")
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68
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69 (defvar itimer-process nil
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70 "Process that drives all itimers, if a subprocess is being used.")
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71
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72 (defvar itimer-timer nil
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73 "Emacs internal timer that drives the itimer system, if a subprocess
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74 is not being used to drive the system.")
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75
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76 (defvar itimer-timer-last-wakeup nil
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77 "The time the timer driver function last ran.")
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78
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79 (defvar itimer-short-interval (if (featurep 'lisp-float-type) 1e-3 1)
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80 "Interval used for scheduling an event a very short time in the future.
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81 Used internally to make the scheduler wake up early.
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82 Unit is seconds.")
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83
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84 ;; This value is maintained internally; it does not determine
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85 ;; itimer granularity. Itimer granularity is 1 second if your
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86 ;; Emacs doens't support floats or your system doesn't have a
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87 ;; clock with microsecond granularity. Otherwise granularity is
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88 ;; to the microsend, although you can't possibly get timers to be
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89 ;; executed with this kind of accuracy in practice. There will
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90 ;; be delays due to system and Emacs internal activity that delay
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91 ;; dealing with syunchronous events and process output.
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92 (defvar itimer-next-wakeup itimer-short-interval
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93 "Itimer process will wakeup to service running itimers within this
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94 many seconds.")
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95
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96 (defvar itimer-edit-map nil
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97 "Keymap used when in Itimer Edit mode.")
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98
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99 (if itimer-edit-map
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100 ()
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101 (setq itimer-edit-map (make-sparse-keymap))
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102 (define-key itimer-edit-map "s" 'itimer-edit-set-field)
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103 (define-key itimer-edit-map "d" 'itimer-edit-delete-itimer)
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104 (define-key itimer-edit-map "q" 'itimer-edit-quit)
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105 (define-key itimer-edit-map "\t" 'itimer-edit-next-field)
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106 (define-key itimer-edit-map " " 'next-line)
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107 (define-key itimer-edit-map "n" 'next-line)
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108 (define-key itimer-edit-map "p" 'previous-line)
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109 (define-key itimer-edit-map "\C-?" 'itimer-edit-previous-field)
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110 (define-key itimer-edit-map "x" 'start-itimer)
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111 (define-key itimer-edit-map "?" 'itimer-edit-help))
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112
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113 (defvar itimer-inside-driver nil)
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114
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115 (defvar itimer-edit-start-marker nil)
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116
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117 ;; macros must come first... or byte-compile'd code will throw back its
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118 ;; head and scream.
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119
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120 (defmacro itimer-decrement (variable)
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121 (list 'setq variable (list '1- variable)))
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122
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123 (defmacro itimer-increment (variable)
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124 (list 'setq variable (list '1+ variable)))
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125
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126 (defmacro itimer-signum (n)
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127 (list 'if (list '> n 0) 1
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128 (list 'if (list 'zerop n) 0 -1)))
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129
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130 ;; Itimer access functions should behave as if they were subrs. These
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131 ;; macros are used to check the arguments to the itimer functions and
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132 ;; signal errors appropriately if the arguments are not valid.
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133
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134 (defmacro check-itimer (var)
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135 "If VAR is not bound to an itimer, signal wrong-type-argument.
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136 This is a macro."
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137 (list 'setq var
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138 (list 'if (list 'itimerp var) var
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139 (list 'signal ''wrong-type-argument
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140 (list 'list ''itimerp var)))))
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141
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142 (defmacro check-itimer-coerce-string (var)
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143 "If VAR is not bound to a string, look up the itimer that it names and
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144 bind VAR to it. Otherwise if VAR is not bound to an itimer, signal
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145 wrong-type-argument. This is a macro."
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146 (list 'setq var
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147 (list 'cond
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148 (list (list 'itimerp var) var)
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149 (list (list 'stringp var) (list 'get-itimer var))
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150 (list t (list 'signal ''wrong-type-argument
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151 (list 'list ''string-or-itimer-p var))))))
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152
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153 (defmacro check-nonnegative-number (var)
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154 "If VAR is not bound to a number, signal wrong-type-argument.
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155 If VAR is not bound to a positive number, signal args-out-of-range.
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156 This is a macro."
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157 (list 'setq var
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158 (list 'if (list 'not (list 'numberp var))
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159 (list 'signal ''wrong-type-argument
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160 (list 'list ''natnump var))
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161 (list 'if (list '< var 0)
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162 (list 'signal ''args-out-of-range (list 'list var))
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163 var))))
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164
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165 (defmacro check-string (var)
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166 "If VAR is not bound to a string, signal wrong-type-argument.
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167 This is a macro."
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168 (list 'setq var
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169 (list 'if (list 'stringp var) var
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170 (list 'signal ''wrong-type-argument
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171 (list 'list ''stringp var)))))
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172
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173 ;; Functions to access and modify itimer attributes.
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174
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175 (defun itimerp (obj)
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176 "Returns non-nil iff OBJ is an itimer."
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177 (and (consp obj) (eq (length obj) 8)))
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178
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179 (defun itimer-live-p (obj)
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180 "Returns non-nil iff OBJ is an itimer and is active.
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181 ``Active'' means Emacs will run it when it expires.
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182 `activate-timer' must be called on a itimer to make it active.
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183 Itimers started with `start-itimer' are automatically active."
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184 (and (itimerp obj) (memq obj itimer-list)))
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185
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186 (defun itimer-name (itimer)
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187 "Returns the name of ITIMER."
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188 (check-itimer itimer)
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189 (car itimer))
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190
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191 (defun itimer-value (itimer)
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192 "Returns the number of seconds until ITIMER expires."
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193 (check-itimer itimer)
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194 (nth 1 itimer))
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195
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196 (defun itimer-restart (itimer)
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197 "Returns the value to which ITIMER will be set at restart.
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198 nil is returned if this itimer doesn't restart."
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199 (check-itimer itimer)
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200 (nth 2 itimer))
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201
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202 (defun itimer-function (itimer)
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203 "Returns the function of ITIMER.
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204 This function is called each time ITIMER expires."
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205 (check-itimer itimer)
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206 (nth 3 itimer))
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207
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208 (defun itimer-is-idle (itimer)
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209 "Returns non-nil if ITIMER is an idle timer.
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210 Normal timers expire after a set interval. Idle timers expire
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211 only after Emacs has been idle for a specific interval. ``Idle''
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212 means no command events within the interval."
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213 (check-itimer itimer)
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214 (nth 4 itimer))
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215
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216 (defun itimer-uses-arguments (itimer)
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217 "Returns non-nil if the function of ITIMER will be called with arguments.
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218 ITIMER's function is called with the arguments each time ITIMER expires.
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219 The arguments themselves are retrievable with `itimer-function-arguments'."
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220 (check-itimer itimer)
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221 (nth 5 itimer))
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222
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223 (defun itimer-function-arguments (itimer)
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224 "Returns the function arguments of ITIMER as a list.
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225 ITIMER's function is called with these argument each timer ITIMER expires."
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226 (check-itimer itimer)
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227 (nth 6 itimer))
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228
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229 (defun itimer-recorded-run-time (itimer)
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230 (check-itimer itimer)
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231 (nth 7 itimer))
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232
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233 (defun set-itimer-value (itimer value)
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234 "Set the timeout value of ITIMER to be VALUE.
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235 Itimer will expire is this many seconds.
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236 If your version of Emacs supports floating point numbers then
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237 VALUE can be a floating point number. Otherwise it
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238 must be an integer.
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239 Returns VALUE."
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240 (check-itimer itimer)
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241 (check-nonnegative-number value)
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242 (let ((inhibit-quit t))
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243 ;; If the itimer is in the active list, and under the new
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244 ;; timeout value would expire before we would normally
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245 ;; wakeup, wakeup now and recompute a new wakeup time.
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246 (or (and (< value itimer-next-wakeup)
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247 (and (itimer-name itimer) (get-itimer (itimer-name itimer)))
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248 (progn (itimer-driver-wakeup)
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249 (setcar (cdr itimer) value)
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250 (itimer-driver-wakeup)
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251 t ))
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252 (setcar (cdr itimer) value))
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253 value))
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254
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255 ;; Same as set-itimer-value but does not wakeup the driver.
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256 ;; Only should be used by the drivers when processing expired timers.
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257 (defun set-itimer-value-internal (itimer value)
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258 (check-itimer itimer)
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259 (check-nonnegative-number value)
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260 (setcar (cdr itimer) value))
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261
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262 (defun set-itimer-restart (itimer restart)
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263 "Set the restart value of ITIMER to be RESTART.
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264 If RESTART is nil, ITIMER will not restart when it expires.
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265 If your version of Emacs supports floating point numbers then
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266 RESTART can be a floating point number. Otherwise it
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267 must be an integer.
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268 Returns RESTART."
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269 (check-itimer itimer)
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270 (if restart (check-nonnegative-number restart))
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271 (setcar (cdr (cdr itimer)) restart))
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272
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273 (defun set-itimer-function (itimer function)
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274 "Set the function of ITIMER to be FUNCTION.
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275 FUNCTION will be called when itimer expires.
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276 Returns FUNCTION."
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277 (check-itimer itimer)
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278 (setcar (nthcdr 3 itimer) function))
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279
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280 (defun set-itimer-is-idle (itimer flag)
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281 "Sets flag that says whether ITIMER is an idle timer.
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282 If FLAG is non-nil, then ITIMER will eb considered an idle timer.
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283 Returns FLAG."
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284 (check-itimer itimer)
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285 (setcar (nthcdr 4 itimer) flag))
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286
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287 (defun set-itimer-uses-arguments (itimer flag)
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288 "Sets flag that says whether the function of ITIMER is called with arguments.
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289 If FLAG is non-nil, then the function will be called with one argument,
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290 otherwise the function will be called with no arguments.
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291 Returns FLAG."
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292 (check-itimer itimer)
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293 (setcar (nthcdr 5 itimer) flag))
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294
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295 (defun set-itimer-function-arguments (itimer &optional arguments)
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296 "Set the function arguments of ITIMER to be ARGUMENTS.
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297 The function of ITIMER will be called with ARGUMENTS when itimer expires.
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298 Returns ARGUMENTS."
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299 (check-itimer itimer)
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300 (setcar (nthcdr 6 itimer) arguments))
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301
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302 (defun set-itimer-recorded-run-time (itimer time)
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303 (check-itimer itimer)
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304 (setcar (nthcdr 7 itimer) time))
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305
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306 (defun get-itimer (name)
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307 "Return itimer named NAME, or nil if there is none."
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308 (check-string name)
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309 (assoc name itimer-list))
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310
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311 (defun read-itimer (prompt &optional initial-input)
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312 "Read the name of an itimer from the minibuffer and return the itimer
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313 associated with that name. The user is prompted with PROMPT.
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314 Optional second arg INITIAL-INPUT non-nil is inserted into the
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315 minibuffer as initial user input."
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316 (get-itimer (completing-read prompt itimer-list nil 'confirm initial-input)))
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317
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318 (defun delete-itimer (itimer)
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319 "Deletes ITIMER. ITIMER may be an itimer or the name of one."
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320 (check-itimer-coerce-string itimer)
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321 (setq itimer-list (delq itimer itimer-list)))
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322
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323 (defun start-itimer (name function value &optional restart
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324 is-idle with-args &rest function-arguments)
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325 "Start an itimer.
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326 Arguments are
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327 NAME, FUNCTION, VALUE &optional RESTART, IS-IDLE, WITH-ARGS, &rest FUNCTION-ARGUMENTS.
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328 NAME is an identifier for the itimer. It must be a string. If an itimer
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329 already exists with this name, NAME will be modified slightly to until
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330 it is unique.
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331 FUNCTION should be a function (or symbol naming one). It
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332 will be called each time the itimer expires with arguments of
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333 FUNCTION-ARGUMENTS. The function can access the itimer that
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334 invoked it through the variable `current-itimer'. If WITH-ARGS
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335 is nil then FUNCTION is called with no arguments. This is for
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336 backward compatibility with older versions of the itimer
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337 package which always called FUNCTION with no arguments.
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338 VALUE is the number of seconds until this itimer expires.
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339 If your version of Emacs supports floating point numbers then
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340 you can VALUE can be a floating point number. Otherwise it
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341 must be an integer.
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342 Optional fourth arg RESTART non-nil means that this itimer should be
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343 restarted automatically after its function is called. Normally an itimer
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344 is deleted at expiration after its function has returned.
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345 If non-nil RESTART should be a number indicating the value at which the
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346 itimer should be set at restart time.
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347 Optional fifth arg IS-IDLE specified if this is an idle timer.
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348 Normal timers eexpire after a set interval. Idle timers expire
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349 only after Emacs has been idle for specific interval. ``Idle''
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350 means no command events within the interval.
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351 Returns the newly created itimer."
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352 (interactive
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353 (list (completing-read "Start itimer: " itimer-list)
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354 (read (completing-read "Itimer function: " obarray 'fboundp))
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355 (let (value)
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356 (while (or (not (numberp value)) (< value 0))
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357 (setq value (read-from-minibuffer "Itimer value: " nil nil t)))
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358 value)
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359 (let ((restart t))
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360 (while (and restart (or (not (numberp restart)) (< restart 0)))
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361 (setq restart (read-from-minibuffer "Itimer restart: "
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362 nil nil t)))
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363 restart)
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364 ;; hard to imagine the user specifying these interactively
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365 nil
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366 nil ))
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367 (check-string name)
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368 (check-nonnegative-number value)
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369 (if restart (check-nonnegative-number restart))
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370 ;; Make proposed itimer name unique if it's not already.
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371 (let ((oname name)
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372 (num 2))
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373 (while (get-itimer name)
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374 (setq name (concat oname "<" num ">"))
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375 (itimer-increment num)))
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376 (activate-itimer (list name value restart function is-idle
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377 with-args function-arguments (list 0 0 0)))
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378 (car itimer-list))
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379
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380 (defun make-itimer ()
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381 "Create an unactivated itimer.
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|
|
382 The itimer will not begin running until activated with `activate-itimer'.
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383 Set the itimer's expire interval with `set-itimer-value'.
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|
|
384 Set the itimer's function interval with `set-itimer-function'.
|
|
|
385 Once this is done, the timer can be activated."
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|
|
386 (list nil 0 nil 'ignore nil nil nil (list 0 0 0)))
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|
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387
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|
|
388 (defun activate-itimer (itimer)
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|
|
389 "Activate ITIMER, which was previously created with `make-itimer'.
|
|
|
390 ITIMER will be added to the global list of running itimers,
|
|
|
391 its FUNCTION will be called when it expires, and so on."
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|
392 (check-itimer itimer)
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393 (if (memq itimer itimer-list)
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394 (error "itimer already activated"))
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|
|
395 (if (not (numberp (itimer-value itimer)))
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396 (error "itimer timeout value not a number: %s" (itimer-value itimer)))
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|
|
397 (if (<= (itimer-value itimer) 0)
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|
398 (error "itimer timeout value not positive: %s" (itimer-value itimer)))
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|
|
399 ;; If there's no itimer driver/process, start one now.
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|
|
400 ;; Otherwise wake up the itimer driver so that seconds slept before
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|
|
401 ;; the new itimer is created won't be counted against it.
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|
402 (if (or itimer-process itimer-timer)
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|
|
403 (itimer-driver-wakeup)
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|
|
404 (itimer-driver-start))
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|
|
405 ;; Roll a unique name for the timer if it doesn't have a name
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|
|
406 ;; already.
|
|
|
407 (if (not (stringp (car itimer)))
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|
|
408 (let ((name "itimer-0")
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|
|
409 (oname "itimer-")
|
|
|
410 (num 1))
|
|
|
411 (while (get-itimer name)
|
|
|
412 (setq name (concat oname "<" num ">"))
|
|
|
413 (itimer-increment num))
|
|
|
414 (setcar itimer name))
|
|
|
415 ;; signal an error if the timer's name matches an already
|
|
|
416 ;; activated timer.
|
|
|
417 (if (get-itimer (itimer-name itimer))
|
|
|
418 (error "itimer named \"%s\" already existing and activated"
|
|
|
419 (itimer-name itimer))))
|
|
|
420 (let ((inhibit-quit t))
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|
|
421 ;; add the itimer to the global list
|
|
|
422 (setq itimer-list (cons itimer itimer-list))
|
|
|
423 ;; If the itimer process is scheduled to wake up too late for
|
|
|
424 ;; the itimer we wake it up to calculate a correct wakeup
|
|
|
425 ;; value giving consideration to the newly added itimer.
|
|
|
426 (if (< (itimer-value itimer) itimer-next-wakeup)
|
|
|
427 (itimer-driver-wakeup))))
|
|
|
428
|
|
|
429 ;; User level functions to list and modify existing itimers.
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|
|
430 ;; Itimer Edit major mode, and the editing commands thereof.
|
|
|
431
|
|
|
432 (defun list-itimers ()
|
|
|
433 "Pop up a buffer containing a list of all itimers.
|
|
|
434 The major mode of the buffer is Itimer Edit mode. This major mode provides
|
|
|
435 commands to manipulate itimers; see the documentation for
|
|
|
436 `itimer-edit-mode' for more information."
|
|
|
437 (interactive)
|
|
|
438 (let* ((buf (get-buffer-create "*Itimer List*"))
|
|
|
439 (opoint (point))
|
|
|
440 (standard-output buf)
|
|
|
441 (itimers (reverse itimer-list)))
|
|
|
442 (set-buffer buf)
|
|
|
443 (itimer-edit-mode)
|
|
|
444 (setq buffer-read-only nil)
|
|
|
445 (erase-buffer)
|
|
|
446 (insert
|
|
|
447 "Name Value Restart Function Idle Arguments"
|
|
|
448 "\n"
|
|
|
449 "---- ----- ------- -------- ---- --------")
|
|
|
450 (if (null itimer-edit-start-marker)
|
|
|
451 (setq itimer-edit-start-marker (point)))
|
|
|
452 (while itimers
|
|
|
453 (newline 1)
|
|
|
454 (prin1 (itimer-name (car itimers)))
|
|
|
455 (tab-to-tab-stop)
|
|
|
456 (insert (itimer-truncate-string
|
|
|
457 (format "%5.5s" (itimer-value (car itimers))) 5))
|
|
|
458 (tab-to-tab-stop)
|
|
|
459 (insert (itimer-truncate-string
|
|
|
460 (format "%5.5s" (itimer-restart (car itimers))) 5))
|
|
|
461 (tab-to-tab-stop)
|
|
|
462 (insert (itimer-truncate-string
|
|
|
463 (format "%.19s" (itimer-function (car itimers))) 19))
|
|
|
464 (tab-to-tab-stop)
|
|
|
465 (if (itimer-is-idle (car itimers))
|
|
|
466 (insert "yes")
|
|
|
467 (insert "no"))
|
|
|
468 (tab-to-tab-stop)
|
|
|
469 (if (itimer-uses-arguments (car itimers))
|
|
|
470 (prin1 (itimer-function-arguments (car itimers)))
|
|
|
471 (prin1 'NONE))
|
|
|
472 (setq itimers (cdr itimers)))
|
|
|
473 ;; restore point
|
|
|
474 (goto-char opoint)
|
|
|
475 (if (< (point) itimer-edit-start-marker)
|
|
|
476 (goto-char itimer-edit-start-marker))
|
|
|
477 (setq buffer-read-only t)
|
|
|
478 (display-buffer buf)))
|
|
|
479
|
|
|
480 (defun edit-itimers ()
|
|
|
481 "Display a list of all itimers and select it for editing.
|
|
|
482 The major mode of the buffer containing the listing is Itimer Edit mode.
|
|
|
483 This major mode provides commands to manipulate itimers; see the documentation
|
|
|
484 for `itimer-edit-mode' for more information."
|
|
|
485 (interactive)
|
|
|
486 ;; since user is editing, make sure displayed data is reasonably up-to-date
|
|
|
487 (if (or itimer-process itimer-timer)
|
|
|
488 (itimer-driver-wakeup))
|
|
|
489 (list-itimers)
|
|
|
490 (select-window (get-buffer-window "*Itimer List*"))
|
|
|
491 (goto-char itimer-edit-start-marker)
|
|
|
492 (if itimer-list
|
|
|
493 (progn
|
|
|
494 (forward-sexp 2)
|
|
|
495 (backward-sexp)))
|
|
|
496 (message "type q to quit, ? for help"))
|
|
|
497
|
|
|
498 ;; no point in making this interactive.
|
|
|
499 (defun itimer-edit-mode ()
|
|
|
500 "Major mode for manipulating itimers.
|
|
|
501 Attributes of running itimers are changed by moving the cursor to the
|
|
|
502 desired field and typing `s' to set that field. The field will then be
|
|
|
503 set to the value read from the minibuffer.
|
|
|
504
|
|
|
505 Commands:
|
|
|
506 TAB move forward a field
|
|
|
507 DEL move backward a field
|
|
|
508 s set a field
|
|
|
509 d delete the selected itimer
|
|
|
510 x start a new itimer
|
|
|
511 ? help"
|
|
|
512 (kill-all-local-variables)
|
|
|
513 (make-local-variable 'tab-stop-list)
|
|
|
514 (setq major-mode 'itimer-edit-mode
|
|
|
515 mode-name "Itimer Edit"
|
|
|
516 truncate-lines t
|
|
|
517 tab-stop-list '(22 32 40 60 67))
|
|
|
518 (abbrev-mode 0)
|
|
|
519 (auto-fill-mode 0)
|
|
|
520 (buffer-disable-undo (current-buffer))
|
|
|
521 (use-local-map itimer-edit-map)
|
|
|
522 (set-syntax-table emacs-lisp-mode-syntax-table))
|
|
|
523
|
|
|
524 (put 'itimer-edit-mode 'mode-class 'special)
|
|
|
525
|
|
|
526 (defun itimer-edit-help ()
|
|
|
527 "Help function for Itimer Edit."
|
|
|
528 (interactive)
|
|
|
529 (if (eq last-command 'itimer-edit-help)
|
|
|
530 (describe-mode)
|
|
|
531 (message "TAB, DEL select fields, (s)et field, (d)elete itimer (type ? for more help)")))
|
|
|
532
|
|
|
533 (defun itimer-edit-quit ()
|
|
|
534 "End Itimer Edit."
|
|
|
535 (interactive)
|
|
|
536 (bury-buffer (current-buffer))
|
|
|
537 (if (one-window-p t)
|
|
|
538 (switch-to-buffer (other-buffer (current-buffer)))
|
|
|
539 (delete-window)))
|
|
|
540
|
|
|
541 (defun itimer-edit-set-field ()
|
|
|
542 (interactive)
|
|
|
543 ;; First two lines in list buffer are headers.
|
|
|
544 ;; Cry out against the luser who attempts to change a field there.
|
|
|
545 (if (<= (point) itimer-edit-start-marker)
|
|
|
546 (error ""))
|
|
|
547 ;; field-value must be initialized to be something other than a
|
|
|
548 ;; number, symbol, or list.
|
|
|
549 (let (itimer field (field-value ""))
|
|
|
550 (setq itimer (save-excursion
|
|
|
551 ;; read the name of the itimer from the beginning of
|
|
|
552 ;; the current line.
|
|
|
553 (beginning-of-line)
|
|
|
554 (get-itimer (read (current-buffer))))
|
|
|
555 field (save-excursion
|
|
|
556 (itimer-edit-beginning-of-field)
|
|
|
557 (let ((opoint (point))
|
|
|
558 (n 0))
|
|
|
559 ;; count the number of sexprs until we reach the cursor
|
|
|
560 ;; and use this info to determine which field the user
|
|
|
561 ;; wants to modify.
|
|
|
562 (beginning-of-line)
|
|
|
563 (while (and (>= opoint (point)) (< n 6))
|
|
|
564 (forward-sexp 2)
|
|
|
565 (backward-sexp)
|
|
|
566 (itimer-increment n))
|
|
|
567 (cond ((eq n 1) (error "Cannot change itimer name."))
|
|
|
568 ((eq n 2) 'value)
|
|
|
569 ((eq n 3) 'restart)
|
|
|
570 ((eq n 4) 'function)
|
|
|
571 ((eq n 5) 'is-idle)
|
|
|
572 (t 'function-argument)))))
|
|
|
573 (cond ((eq field 'value)
|
|
|
574 (let ((prompt "Set itimer value: "))
|
|
|
575 (while (not (natnump field-value))
|
|
|
576 (setq field-value (read-from-minibuffer prompt nil nil t)))))
|
|
|
577 ((eq field 'restart)
|
|
|
578 (let ((prompt "Set itimer restart: "))
|
|
|
579 (while (and field-value (not (natnump field-value)))
|
|
|
580 (setq field-value (read-from-minibuffer prompt nil nil t)))))
|
|
|
581 ((eq field 'function)
|
|
|
582 (let ((prompt "Set itimer function: "))
|
|
|
583 (while (not (or (and (symbolp field-value) (fboundp field-value))
|
|
|
584 (and (consp field-value)
|
|
|
585 (memq (car field-value) '(lambda macro)))))
|
|
|
586 (setq field-value
|
|
|
587 (read (completing-read prompt obarray 'fboundp nil))))))
|
|
|
588 ((eq field 'is-idle)
|
|
|
589 (setq field-value (not (itimer-is-idle itimer))))
|
|
|
590 ((eq field 'function-argument)
|
|
|
591 (let ((prompt "Set itimer function argument: "))
|
|
|
592 (setq field-value (read-expression prompt))
|
|
|
593 (cond ((not (listp field-value))
|
|
|
594 (setq field-value (list field-value))))
|
|
|
595 (if (null field-value)
|
|
|
596 (set-itimer-uses-arguments itimer nil)
|
|
|
597 (set-itimer-uses-arguments itimer t)))))
|
|
|
598 ;; set the itimer field
|
|
|
599 (funcall (intern (concat "set-itimer-" (symbol-name field)))
|
|
|
600 itimer field-value)
|
|
|
601 ;; move to beginning of field to be changed
|
|
|
602 (itimer-edit-beginning-of-field)
|
|
|
603 ;; modify the list buffer to reflect the change.
|
|
|
604 (let (buffer-read-only kill-ring)
|
|
|
605 (kill-sexp 1)
|
|
|
606 (kill-region (point) (progn (skip-chars-forward " \t") (point)))
|
|
|
607 (prin1 field-value (current-buffer))
|
|
|
608 (if (not (eolp))
|
|
|
609 (tab-to-tab-stop))
|
|
|
610 (backward-sexp))))
|
|
|
611
|
|
|
612 (defun itimer-edit-delete-itimer ()
|
|
|
613 (interactive)
|
|
|
614 ;; First two lines in list buffer are headers.
|
|
|
615 ;; Cry out against the luser who attempts to change a field there.
|
|
|
616 (if (<= (point) itimer-edit-start-marker)
|
|
|
617 (error ""))
|
|
|
618 (delete-itimer
|
|
|
619 (read-itimer "Delete itimer: "
|
|
|
620 (save-excursion (beginning-of-line) (read (current-buffer)))))
|
|
|
621 ;; update list information
|
|
|
622 (list-itimers))
|
|
|
623
|
|
|
624 (defun itimer-edit-next-field (count)
|
|
|
625 (interactive "p")
|
|
|
626 (itimer-edit-beginning-of-field)
|
|
|
627 (cond ((> (itimer-signum count) 0)
|
|
|
628 (while (not (zerop count))
|
|
|
629 (forward-sexp)
|
|
|
630 ;; wrap from eob to itimer-edit-start-marker
|
|
|
631 (if (eobp)
|
|
|
632 (progn
|
|
|
633 (goto-char itimer-edit-start-marker)
|
|
|
634 (forward-sexp)))
|
|
|
635 (forward-sexp)
|
|
|
636 (backward-sexp)
|
|
|
637 ;; treat fields at beginning of line as if they weren't there.
|
|
|
638 (if (bolp)
|
|
|
639 (progn
|
|
|
640 (forward-sexp 2)
|
|
|
641 (backward-sexp)))
|
|
|
642 (itimer-decrement count)))
|
|
|
643 ((< (itimer-signum count) 0)
|
|
|
644 (while (not (zerop count))
|
|
|
645 (backward-sexp)
|
|
|
646 ;; treat fields at beginning of line as if they weren't there.
|
|
|
647 (if (bolp)
|
|
|
648 (backward-sexp))
|
|
|
649 ;; wrap from itimer-edit-start-marker to field at eob.
|
|
|
650 (if (<= (point) itimer-edit-start-marker)
|
|
|
651 (progn
|
|
|
652 (goto-char (point-max))
|
|
|
653 (backward-sexp)))
|
|
|
654 (itimer-increment count)))))
|
|
|
655
|
|
|
656 (defun itimer-edit-previous-field (count)
|
|
|
657 (interactive "p")
|
|
|
658 (itimer-edit-next-field (- count)))
|
|
|
659
|
|
|
660 (defun itimer-edit-beginning-of-field ()
|
|
|
661 (let ((forw-back (save-excursion (forward-sexp) (backward-sexp) (point)))
|
|
|
662 (back (save-excursion (backward-sexp) (point))))
|
|
|
663 (cond ((eq forw-back back) (backward-sexp))
|
|
|
664 ((eq forw-back (point)) t)
|
|
|
665 (t (backward-sexp)))))
|
|
|
666
|
|
|
667 (defun itimer-truncate-string (str len)
|
|
|
668 (if (<= (length str) len)
|
|
|
669 str
|
|
|
670 (substring str 0 len)))
|
|
|
671
|
|
|
672 ;; internals of the itimer implementation.
|
|
|
673
|
|
|
674 (defun itimer-run-expired-timers (time-elapsed)
|
|
|
675 (let ((itimers (copy-sequence itimer-list))
|
|
|
676 (itimer)
|
|
|
677 (next-wakeup 600)
|
|
|
678 (idle-time)
|
|
|
679 (last-event-time)
|
|
|
680 (recorded-run-time)
|
|
|
681 ;; process filters can be hit by stray C-g's from the user,
|
|
|
682 ;; so we must protect this stuff appropriately.
|
|
|
683 ;; Quit's are allowed from within itimer functions, but we
|
|
|
684 ;; catch them and print a message.
|
|
|
685 (inhibit-quit t))
|
|
|
686 (setq next-wakeup 600)
|
|
|
687 (if (and (boundp 'last-input-time) (consp last-input-time))
|
|
|
688 (setq last-event-time (list (car last-input-time)
|
|
|
689 (cdr last-input-time)
|
|
|
690 0)
|
|
|
691 idle-time (itimer-time-difference (current-time)
|
|
|
692 last-event-time))
|
|
|
693 ;; no way to do this under FSF Emacs yet.
|
|
|
694 (setq last-event-time '(0 0 0)
|
|
|
695 idle-time 0))
|
|
|
696 (while itimers
|
|
|
697 (setq itimer (car itimers))
|
|
|
698 (if (itimer-is-idle itimer)
|
|
|
699 (setq recorded-run-time (itimer-recorded-run-time itimer))
|
|
|
700 (set-itimer-value-internal itimer (max 0 (- (itimer-value itimer)
|
|
|
701 time-elapsed))))
|
|
|
702 (if (if (itimer-is-idle itimer)
|
|
|
703 (or (> (itimer-time-difference recorded-run-time
|
|
|
704 last-event-time)
|
|
|
705 0)
|
|
|
706 (< idle-time (itimer-value itimer)))
|
|
|
707 (> (itimer-value itimer) 0))
|
|
|
708 (setq next-wakeup
|
|
|
709 (if (itimer-is-idle itimer)
|
|
|
710 (if (< idle-time (itimer-value itimer))
|
|
|
711 (min next-wakeup (- (itimer-value itimer) idle-time))
|
|
|
712 (min next-wakeup (itimer-value itimer)))
|
|
|
713 (min next-wakeup (itimer-value itimer))))
|
|
|
714 (and (itimer-is-idle itimer)
|
|
|
715 (set-itimer-recorded-run-time itimer (current-time)))
|
|
|
716 ;; itimer has expired, we must call its function.
|
|
|
717 ;; protect our local vars from the itimer function.
|
|
|
718 ;; allow keyboard quit to occur, but catch and report it.
|
|
|
719 ;; provide the variable `current-itimer' in case the function
|
|
|
720 ;; is interested.
|
|
|
721 (unwind-protect
|
|
|
722 (condition-case condition-data
|
|
|
723 (save-match-data
|
|
|
724 (let* ((current-itimer itimer)
|
|
|
725 (quit-flag nil)
|
|
|
726 (inhibit-quit nil)
|
|
|
727 ;; for FSF Emacs timer.el emulation under XEmacs.
|
|
|
728 ;; eldoc expect this to be done, apparently.
|
|
|
729 (this-command nil)
|
|
|
730 itimer itimers time-elapsed)
|
|
|
731 (if (itimer-uses-arguments current-itimer)
|
|
|
732 (apply (itimer-function current-itimer)
|
|
|
733 (itimer-function-arguments current-itimer))
|
|
|
734 (funcall (itimer-function current-itimer)))))
|
|
|
735 (error (message "itimer \"%s\" signaled: %s" (itimer-name itimer)
|
|
|
736 (prin1-to-string condition-data)))
|
|
|
737 (quit (message "itimer \"%s\" quit" (itimer-name itimer))))
|
|
|
738 ;; restart the itimer if we should, otherwise delete it.
|
|
|
739 (if (null (itimer-restart itimer))
|
|
|
740 (delete-itimer itimer)
|
|
|
741 (set-itimer-value-internal itimer (itimer-restart itimer))
|
|
|
742 (setq next-wakeup (min next-wakeup (itimer-value itimer))))))
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|
|
743 (setq itimers (cdr itimers)))
|
|
|
744 ;; if user is editing itimers, update displayed info
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|
|
745 (if (eq major-mode 'itimer-edit-mode)
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|
|
746 (list-itimers))
|
|
|
747 next-wakeup ))
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|
|
748
|
|
|
749 (defun itimer-process-filter (process string)
|
|
|
750 ;; If the itimer process dies and generates output while doing
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|
|
751 ;; so, we may be called before the process-sentinel. Sanity
|
|
|
752 ;; check the output just in case...
|
|
|
753 (if (not (string-match "^[0-9]" string))
|
|
|
754 (progn (message "itimer process gave odd output: %s" string)
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|
|
755 ;; it may be still alive and waiting for input
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|
|
756 (process-send-string itimer-process "3\n"))
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|
|
757 ;; if there are no active itimers, return quickly.
|
|
|
758 (if itimer-list
|
|
|
759 (let ((wakeup nil))
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|
|
760 (unwind-protect
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|
|
761 (setq wakeup (itimer-run-expired-timers (string-to-int string)))
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|
|
762 (and (null wakeup) (process-send-string process "1\n")))
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|
|
763 (setq itimer-next-wakeup wakeup))
|
|
|
764 (setq itimer-next-wakeup 600))
|
|
|
765 ;; tell itimer-process when to wakeup again
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|
|
766 (process-send-string itimer-process
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|
|
767 (concat (int-to-string itimer-next-wakeup)
|
|
|
768 "\n"))))
|
|
|
769
|
|
|
770 (defun itimer-process-sentinel (process message)
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|
|
771 (let ((inhibit-quit t))
|
|
|
772 (if (eq (process-status process) 'stop)
|
|
|
773 (continue-process process)
|
|
|
774 ;; not stopped, so it must have died.
|
|
|
775 ;; cleanup first...
|
|
|
776 (delete-process process)
|
|
|
777 (setq itimer-process nil)
|
|
|
778 ;; now, if there are any active itimers then we need to immediately
|
|
|
779 ;; start another itimer process, otherwise we can wait until the next
|
|
|
780 ;; start-itimer call, which will start one automatically.
|
|
|
781 (if (null itimer-list)
|
|
|
782 ()
|
|
|
783 ;; there may have been an error message in the echo area;
|
|
|
784 ;; give the user at least a little time to read it.
|
|
|
785 (sit-for 2)
|
|
|
786 (message "itimer process %s... respawning." (substring message 0 -1))
|
|
|
787 (itimer-process-start)))))
|
|
|
788
|
|
|
789 (defun itimer-process-start ()
|
|
|
790 (let ((inhibit-quit t)
|
|
|
791 (process-connection-type nil))
|
|
|
792 (setq itimer-process (start-process "itimer" nil "itimer"))
|
|
|
793 (process-kill-without-query itimer-process)
|
|
|
794 (set-process-filter itimer-process 'itimer-process-filter)
|
|
|
795 (set-process-sentinel itimer-process 'itimer-process-sentinel)
|
|
|
796 ;; Tell itimer process to wake up quickly, so that a correct
|
|
|
797 ;; wakeup time can be computed. Zero loses because of
|
|
|
798 ;; underlying itimer implementations that use 0 to mean
|
|
|
799 ;; `disable the itimer'.
|
|
|
800 (setq itimer-next-wakeup itimer-short-interval)
|
|
|
801 (process-send-string itimer-process
|
|
|
802 (format "%s\n" itimer-next-wakeup))))
|
|
|
803
|
|
|
804 (defun itimer-process-wakeup ()
|
|
|
805 (interrupt-process itimer-process)
|
|
|
806 (accept-process-output))
|
|
|
807
|
|
|
808 (defun itimer-timer-start ()
|
|
|
809 (let ((inhibit-quit t))
|
|
|
810 (setq itimer-next-wakeup itimer-short-interval
|
|
|
811 itimer-timer-last-wakeup (current-time)
|
|
|
812 itimer-timer (add-timeout itimer-short-interval
|
|
|
813 'itimer-timer-driver nil nil))))
|
|
|
814
|
|
|
815 (defun itimer-timer-wakeup ()
|
|
|
816 (let ((inhibit-quit t))
|
|
|
817 (cond ((fboundp 'disable-timeout)
|
|
|
818 (disable-timeout itimer-timer))
|
|
|
819 ((fboundp 'cancel-timer)
|
|
|
820 (cancel-timer itimer-timer)))
|
|
|
821 (setq itimer-timer (add-timeout itimer-short-interval
|
|
|
822 'itimer-timer-driver nil 5))))
|
|
|
823
|
|
|
824 (defun itimer-time-difference (t1 t2)
|
|
|
825 (let (usecs secs 65536-secs carry)
|
|
|
826 (setq usecs (- (nth 2 t1) (nth 2 t2)))
|
|
|
827 (if (< usecs 0)
|
|
|
828 (setq carry 1
|
|
|
829 usecs (+ usecs 1000000))
|
|
|
830 (setq carry 0))
|
|
|
831 (setq secs (- (nth 1 t1) (nth 1 t2) carry))
|
|
|
832 (if (< secs 0)
|
|
|
833 (setq carry 1
|
|
|
834 secs (+ secs 65536))
|
|
|
835 (setq carry 0))
|
|
|
836 (setq 65536-secs (- (nth 0 t1) (nth 0 t2) carry))
|
|
|
837 ;; loses for interval larger than the maximum signed Lisp integer.
|
|
|
838 ;; can't really be helped.
|
|
|
839 (+ (* 65536-secs 65536)
|
|
|
840 secs
|
|
|
841 (/ usecs (if (featurep 'lisp-float-type) 1e6 1000000)))))
|
|
|
842
|
|
|
843 (defun itimer-timer-driver (&rest ignored)
|
|
|
844 ;; inhibit quit because if the user quits at an inopportune
|
|
|
845 ;; time, the timer process won't bne launched again and the
|
|
|
846 ;; system stops working. itimer-run-expired-timers allows
|
|
|
847 ;; individual timer function to be aborted, so the user can
|
|
|
848 ;; escape a feral timer function.
|
|
|
849 (if (not itimer-inside-driver)
|
|
|
850 (let* ((inhibit-quit t)
|
|
|
851 (itimer-inside-driver t)
|
|
|
852 (now (current-time))
|
|
|
853 (elapsed (itimer-time-difference now itimer-timer-last-wakeup))
|
|
|
854 (sleep nil))
|
|
|
855 (setq itimer-timer-last-wakeup now
|
|
|
856 sleep (itimer-run-expired-timers elapsed))
|
|
|
857 (disable-timeout itimer-timer)
|
|
|
858 (setq itimer-next-wakeup sleep
|
|
|
859 itimer-timer (add-timeout sleep 'itimer-timer-driver nil 5)))))
|
|
|
860
|
|
|
861 (defun itimer-driver-start ()
|
|
|
862 (if (fboundp 'add-timeout)
|
|
|
863 (itimer-timer-start)
|
|
|
864 (itimer-process-start)))
|
|
|
865
|
|
|
866 (defun itimer-driver-wakeup ()
|
|
|
867 (if (fboundp 'add-timeout)
|
|
|
868 (itimer-timer-wakeup)
|
|
|
869 (itimer-process-wakeup)))
|
|
|
870
|
|
|
871 ;;; itimer.el ends here
|
