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1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
2 <html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1">
3 <title>PEAK Library: Timer</title>
4 <link href="doxygen.css" rel="stylesheet" type="text/css">
5 </head><body>
6 <!-- Generated by Doxygen 1.3.5 -->
7 <div class="qindex"><a class="qindex" href="index.html">Main&nbsp;Page</a> | <a class="qindex" href="modules.html">Modules</a> | <a class="qindex" href="annotated.html">Data&nbsp;Structures</a> | <a class="qindex" href="functions.html">Data&nbsp;Fields</a></div>
8 <h1>Timer</h1><hr><a name="_details"></a><h2>Detailed Description</h2>
9 Lightweight timer/repeater support within a task. Units are floats in seconds with an internal precision up to usec, but subjects to client's event handlers so don't expect a lot.<br>
10 For best results, please use in conjunction with the Time module (<code>peak_time*</code>).
11 <p>
12 <table border=0 cellpadding=0 cellspacing=0>
13 <tr><td></td></tr>
14 <tr><td colspan=2><br><h2>Typedefs</h2></td></tr>
15 <tr><td class="memItemLeft" nowrap align=right valign=top><a class="anchor" name="ga0" doxytag="timer::peak_timer" ></a>
16 typedef __peak_timer *&nbsp;</td><td class="memItemRight" valign=bottom><a class="el" href="group__timer.html#ga0">peak_timer</a></td></tr>
17
18 <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Opaque timer pointer type. <br><br></td></tr>
19 <tr><td class="memItemLeft" nowrap align=right valign=top><a class="anchor" name="ga1" doxytag="timer::peak_timer_callback" ></a>
20 typedef void(*&nbsp;</td><td class="memItemRight" valign=bottom><a class="el" href="group__timer.html#ga1">peak_timer_callback</a> )(<a class="el" href="group__timer.html#ga0">peak_timer</a> t, void *context)</td></tr>
21
22 <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Timer callback. <br><br></td></tr>
23 <tr><td colspan=2><br><h2>Functions</h2></td></tr>
24 <tr><td class="memItemLeft" nowrap align=right valign=top><a class="el" href="group__timer.html#ga0">peak_timer</a>&nbsp;</td><td class="memItemRight" valign=bottom><a class="el" href="group__timer.html#ga2">peak_timer_create</a> (double fire, double interval, <a class="el" href="group__timer.html#ga1">peak_timer_callback</a> callout, void *context)</td></tr>
25
26 <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Create a timer. <a href="#ga2"></a><br><br></td></tr>
27 <tr><td class="memItemLeft" nowrap align=right valign=top>void&nbsp;</td><td class="memItemRight" valign=bottom><a class="el" href="group__timer.html#ga3">peak_timer_configure</a> (<a class="el" href="group__timer.html#ga0">peak_timer</a> t, double fire, double interval)</td></tr>
28
29 <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">(Re)configure a timer. <a href="#ga3"></a><br><br></td></tr>
30 <tr><td class="memItemLeft" nowrap align=right valign=top>double&nbsp;</td><td class="memItemRight" valign=bottom><a class="el" href="group__timer.html#ga4">peak_timer_get_firetime</a> (<a class="el" href="group__timer.html#ga0">peak_timer</a> t)</td></tr>
31
32 <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Get timer's fire date time. <a href="#ga4"></a><br><br></td></tr>
33 <tr><td class="memItemLeft" nowrap align=right valign=top>double&nbsp;</td><td class="memItemRight" valign=bottom><a class="el" href="group__timer.html#ga5">peak_timer_get_interval</a> (<a class="el" href="group__timer.html#ga0">peak_timer</a> t)</td></tr>
34
35 <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Get timer's repeat-interval time. <a href="#ga5"></a><br><br></td></tr>
36 <tr><td class="memItemLeft" nowrap align=right valign=top>void *&nbsp;</td><td class="memItemRight" valign=bottom><a class="el" href="group__timer.html#ga6">peak_timer_get_context</a> (<a class="el" href="group__timer.html#ga0">peak_timer</a> t)</td></tr>
37
38 <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Get timer's extra application-defined context. <a href="#ga6"></a><br><br></td></tr>
39 <tr><td class="memItemLeft" nowrap align=right valign=top>void&nbsp;</td><td class="memItemRight" valign=bottom><a class="el" href="group__timer.html#ga7">peak_timer_set_context</a> (<a class="el" href="group__timer.html#ga0">peak_timer</a> t, void *context)</td></tr>
40
41 <tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Change the context pointer of a timer. <a href="#ga7"></a><br><br></td></tr>
42 </table>
43 <hr><h2>Function Documentation</h2>
44 <a class="anchor" name="ga3" doxytag="timer.h::peak_timer_configure" ></a><p>
45 <table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
46 <tr>
47 <td class="mdRow">
48 <table cellpadding="0" cellspacing="0" border="0">
49 <tr>
50 <td class="md" nowrap valign="top"> void peak_timer_configure </td>
51 <td class="md" valign="top">(&nbsp;</td>
52 <td class="md" nowrap valign="top"><a class="el" href="group__timer.html#ga0">peak_timer</a>&nbsp;</td>
53 <td class="mdname" nowrap> <em>t</em>, </td>
54 </tr>
55 <tr>
56 <td></td>
57 <td></td>
58 <td class="md" nowrap>double&nbsp;</td>
59 <td class="mdname" nowrap> <em>fire</em>, </td>
60 </tr>
61 <tr>
62 <td></td>
63 <td></td>
64 <td class="md" nowrap>double&nbsp;</td>
65 <td class="mdname" nowrap> <em>interval</em></td>
66 </tr>
67 <tr>
68 <td></td>
69 <td class="md">)&nbsp;</td>
70 <td class="md" colspan="2"></td>
71 </tr>
72
73 </table>
74 </td>
75 </tr>
76 </table>
77 <table cellspacing=5 cellpadding=0 border=0>
78 <tr>
79 <td>
80 &nbsp;
81 </td>
82 <td>
83
84 <p>
85 (Re)configure a timer.
86 <p>
87 <dl compact><dt><b>Parameters:</b></dt><dd>
88 <table border="0" cellspacing="2" cellpadding="0">
89 <tr><td valign=top><em>t</em>&nbsp;</td><td>The timer reference to configure. </td></tr>
90 <tr><td valign=top><em>fire</em>&nbsp;</td><td>Relative fire time in second. 0 means immediate fire (as soon as possible, usually during the next event loop). A value of -1.0 means never fire, and can be useful to temporarily "disable" a timer. </td></tr>
91 <tr><td valign=top><em>interval</em>&nbsp;</td><td>Repeat interval in second. Use -1.0 for a one-shot timer. Value must be strictly positive for repeating timer. </td></tr>
92 </table>
93 </dl>
94 </td>
95 </tr>
96 </table>
97 <a class="anchor" name="ga2" doxytag="timer.h::peak_timer_create" ></a><p>
98 <table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
99 <tr>
100 <td class="mdRow">
101 <table cellpadding="0" cellspacing="0" border="0">
102 <tr>
103 <td class="md" nowrap valign="top"> <a class="el" href="group__timer.html#ga0">peak_timer</a> peak_timer_create </td>
104 <td class="md" valign="top">(&nbsp;</td>
105 <td class="md" nowrap valign="top">double&nbsp;</td>
106 <td class="mdname" nowrap> <em>fire</em>, </td>
107 </tr>
108 <tr>
109 <td></td>
110 <td></td>
111 <td class="md" nowrap>double&nbsp;</td>
112 <td class="mdname" nowrap> <em>interval</em>, </td>
113 </tr>
114 <tr>
115 <td></td>
116 <td></td>
117 <td class="md" nowrap><a class="el" href="group__timer.html#ga1">peak_timer_callback</a>&nbsp;</td>
118 <td class="mdname" nowrap> <em>callout</em>, </td>
119 </tr>
120 <tr>
121 <td></td>
122 <td></td>
123 <td class="md" nowrap>void *&nbsp;</td>
124 <td class="mdname" nowrap> <em>context</em></td>
125 </tr>
126 <tr>
127 <td></td>
128 <td class="md">)&nbsp;</td>
129 <td class="md" colspan="2"></td>
130 </tr>
131
132 </table>
133 </td>
134 </tr>
135 </table>
136 <table cellspacing=5 cellpadding=0 border=0>
137 <tr>
138 <td>
139 &nbsp;
140 </td>
141 <td>
142
143 <p>
144 Create a timer.
145 <p>
146 Note that the timer isn't activated until you add it to the task of your choice (usually <a class="el" href="group__task__common.html#ga8">peak_task_self()</a>) with <a class="el" href="group__task__timer.html#ga24">peak_task_timer_add()</a>.<p>
147 <dl compact><dt><b>Parameters:</b></dt><dd>
148 <table border="0" cellspacing="2" cellpadding="0">
149 <tr><td valign=top><em>fire</em>&nbsp;</td><td>Relative fire time in second. 0 means immediate fire (as soon as possible, usually during the next event loop). A value of -1.0 means never fire, and can be useful to temporarily "disable" a timer. </td></tr>
150 <tr><td valign=top><em>interval</em>&nbsp;</td><td>Repeat interval in second. Use -1.0 for a one-shot timer. Value must be strictly positive for repeating timer. </td></tr>
151 <tr><td valign=top><em>callout</em>&nbsp;</td><td>A pointer to your timer callback function which is triggered when the timer fires. </td></tr>
152 <tr><td valign=top><em>context</em>&nbsp;</td><td>An extra application-defined pointer that will be passed to your timer callback function (it's not used by the library).</td></tr>
153 </table>
154 </dl>
155 <dl compact><dt><b>Returns:</b></dt><dd>A newly allocated <code>peak_timer</code> reference or <code>NULL</code> if the timer cannot be created. </dd></dl>
156 </td>
157 </tr>
158 </table>
159 <a class="anchor" name="ga6" doxytag="timer.h::peak_timer_get_context" ></a><p>
160 <table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
161 <tr>
162 <td class="mdRow">
163 <table cellpadding="0" cellspacing="0" border="0">
164 <tr>
165 <td class="md" nowrap valign="top"> void* peak_timer_get_context </td>
166 <td class="md" valign="top">(&nbsp;</td>
167 <td class="md" nowrap valign="top"><a class="el" href="group__timer.html#ga0">peak_timer</a>&nbsp;</td>
168 <td class="mdname1" valign="top" nowrap> <em>t</em> </td>
169 <td class="md" valign="top">&nbsp;)&nbsp;</td>
170 <td class="md" nowrap></td>
171 </tr>
172
173 </table>
174 </td>
175 </tr>
176 </table>
177 <table cellspacing=5 cellpadding=0 border=0>
178 <tr>
179 <td>
180 &nbsp;
181 </td>
182 <td>
183
184 <p>
185 Get timer's extra application-defined context.
186 <p>
187 <dl compact><dt><b>Parameters:</b></dt><dd>
188 <table border="0" cellspacing="2" cellpadding="0">
189 <tr><td valign=top><em>t</em>&nbsp;</td><td>The timer reference.</td></tr>
190 </table>
191 </dl>
192 <dl compact><dt><b>Returns:</b></dt><dd>Context pointer. </dd></dl>
193 </td>
194 </tr>
195 </table>
196 <a class="anchor" name="ga4" doxytag="timer.h::peak_timer_get_firetime" ></a><p>
197 <table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
198 <tr>
199 <td class="mdRow">
200 <table cellpadding="0" cellspacing="0" border="0">
201 <tr>
202 <td class="md" nowrap valign="top"> double peak_timer_get_firetime </td>
203 <td class="md" valign="top">(&nbsp;</td>
204 <td class="md" nowrap valign="top"><a class="el" href="group__timer.html#ga0">peak_timer</a>&nbsp;</td>
205 <td class="mdname1" valign="top" nowrap> <em>t</em> </td>
206 <td class="md" valign="top">&nbsp;)&nbsp;</td>
207 <td class="md" nowrap></td>
208 </tr>
209
210 </table>
211 </td>
212 </tr>
213 </table>
214 <table cellspacing=5 cellpadding=0 border=0>
215 <tr>
216 <td>
217 &nbsp;
218 </td>
219 <td>
220
221 <p>
222 Get timer's fire date time.
223 <p>
224 <dl compact><dt><b>Parameters:</b></dt><dd>
225 <table border="0" cellspacing="2" cellpadding="0">
226 <tr><td valign=top><em>t</em>&nbsp;</td><td>The timer reference.</td></tr>
227 </table>
228 </dl>
229 <dl compact><dt><b>Returns:</b></dt><dd>Absolute time in second before the timer fires (if it is added to a task). </dd></dl>
230 </td>
231 </tr>
232 </table>
233 <a class="anchor" name="ga5" doxytag="timer.h::peak_timer_get_interval" ></a><p>
234 <table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
235 <tr>
236 <td class="mdRow">
237 <table cellpadding="0" cellspacing="0" border="0">
238 <tr>
239 <td class="md" nowrap valign="top"> double peak_timer_get_interval </td>
240 <td class="md" valign="top">(&nbsp;</td>
241 <td class="md" nowrap valign="top"><a class="el" href="group__timer.html#ga0">peak_timer</a>&nbsp;</td>
242 <td class="mdname1" valign="top" nowrap> <em>t</em> </td>
243 <td class="md" valign="top">&nbsp;)&nbsp;</td>
244 <td class="md" nowrap></td>
245 </tr>
246
247 </table>
248 </td>
249 </tr>
250 </table>
251 <table cellspacing=5 cellpadding=0 border=0>
252 <tr>
253 <td>
254 &nbsp;
255 </td>
256 <td>
257
258 <p>
259 Get timer's repeat-interval time.
260 <p>
261 <dl compact><dt><b>Parameters:</b></dt><dd>
262 <table border="0" cellspacing="2" cellpadding="0">
263 <tr><td valign=top><em>t</em>&nbsp;</td><td>The timer reference.</td></tr>
264 </table>
265 </dl>
266 <dl compact><dt><b>Returns:</b></dt><dd>Interval time in second. </dd></dl>
267 </td>
268 </tr>
269 </table>
270 <a class="anchor" name="ga7" doxytag="timer.h::peak_timer_set_context" ></a><p>
271 <table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
272 <tr>
273 <td class="mdRow">
274 <table cellpadding="0" cellspacing="0" border="0">
275 <tr>
276 <td class="md" nowrap valign="top"> void peak_timer_set_context </td>
277 <td class="md" valign="top">(&nbsp;</td>
278 <td class="md" nowrap valign="top"><a class="el" href="group__timer.html#ga0">peak_timer</a>&nbsp;</td>
279 <td class="mdname" nowrap> <em>t</em>, </td>
280 </tr>
281 <tr>
282 <td></td>
283 <td></td>
284 <td class="md" nowrap>void *&nbsp;</td>
285 <td class="mdname" nowrap> <em>context</em></td>
286 </tr>
287 <tr>
288 <td></td>
289 <td class="md">)&nbsp;</td>
290 <td class="md" colspan="2"></td>
291 </tr>
292
293 </table>
294 </td>
295 </tr>
296 </table>
297 <table cellspacing=5 cellpadding=0 border=0>
298 <tr>
299 <td>
300 &nbsp;
301 </td>
302 <td>
303
304 <p>
305 Change the context pointer of a timer.
306 <p>
307 <dl compact><dt><b>Parameters:</b></dt><dd>
308 <table border="0" cellspacing="2" cellpadding="0">
309 <tr><td valign=top><em>t</em>&nbsp;</td><td>The timer reference. </td></tr>
310 <tr><td valign=top><em>context</em>&nbsp;</td><td>An extra application-defined pointer that will be passed to your timer callback function (it's not used by the library). </td></tr>
311 </table>
312 </dl>
313 </td>
314 </tr>
315 </table>
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