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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Timers: GLib Reference Manual</title> <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> <link rel="home" href="index.html" title="GLib Reference Manual"> <link rel="up" href="glib-utilities.html" title="GLib Utilities"> <link rel="prev" href="glib-Lexical-Scanner.html" title="Lexical Scanner"> <link rel="next" href="glib-Spawning-Processes.html" title="Spawning Processes"> <meta name="generator" content="GTK-Doc V1.32 (XML mode)"> <link rel="stylesheet" href="style.css" type="text/css"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle"> <td width="100%" align="left" class="shortcuts"> <a href="#" class="shortcut">Top</a><span id="nav_description"> <span class="dim">|</span> <a href="#glib-Timers.description" class="shortcut">Description</a></span> </td> <td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td> <td><a accesskey="u" href="glib-utilities.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td> <td><a accesskey="p" href="glib-Lexical-Scanner.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> <td><a accesskey="n" href="glib-Spawning-Processes.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> </tr></table> <div class="refentry"> <a name="glib-Timers"></a><div class="titlepage"></div> <div class="refnamediv"><table width="100%"><tr> <td valign="top"> <h2><span class="refentrytitle"><a name="glib-Timers.top_of_page"></a>Timers</span></h2> <p>Timers — keep track of elapsed time</p> </td> <td class="gallery_image" valign="top" align="right"></td> </tr></table></div> <div class="refsect1"> <a name="glib-Timers.functions"></a><h2>Functions</h2> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="functions_proto_type"> <col class="functions_proto_name"> </colgroup> <tbody> <tr> <td class="function_type"> <a class="link" href="glib-Timers.html#GTimer" title="GTimer"><span class="returnvalue">GTimer</span></a> * </td> <td class="function_name"> <a class="link" href="glib-Timers.html#g-timer-new" title="g_timer_new ()">g_timer_new</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <span class="returnvalue">void</span> </td> <td class="function_name"> <a class="link" href="glib-Timers.html#g-timer-start" title="g_timer_start ()">g_timer_start</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <span class="returnvalue">void</span> </td> <td class="function_name"> <a class="link" href="glib-Timers.html#g-timer-stop" title="g_timer_stop ()">g_timer_stop</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <span class="returnvalue">void</span> </td> <td class="function_name"> <a class="link" href="glib-Timers.html#g-timer-continue" title="g_timer_continue ()">g_timer_continue</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-Basic-Types.html#gdouble" title="gdouble"><span class="returnvalue">gdouble</span></a> </td> <td class="function_name"> <a class="link" href="glib-Timers.html#g-timer-elapsed" title="g_timer_elapsed ()">g_timer_elapsed</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <span class="returnvalue">void</span> </td> <td class="function_name"> <a class="link" href="glib-Timers.html#g-timer-reset" title="g_timer_reset ()">g_timer_reset</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <span class="returnvalue">void</span> </td> <td class="function_name"> <a class="link" href="glib-Timers.html#g-timer-destroy" title="g_timer_destroy ()">g_timer_destroy</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> </td> <td class="function_name"> <a class="link" href="glib-Timers.html#g-timer-is-active" title="g_timer_is_active ()">g_timer_is_active</a> <span class="c_punctuation">()</span> </td> </tr> </tbody> </table></div> </div> <div class="refsect1"> <a name="glib-Timers.other"></a><h2>Types and Values</h2> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="other_proto_type"> <col class="other_proto_name"> </colgroup> <tbody><tr> <td class="datatype_keyword"> </td> <td class="function_name"><a class="link" href="glib-Timers.html#GTimer" title="GTimer">GTimer</a></td> </tr></tbody> </table></div> </div> <div class="refsect1"> <a name="glib-Timers.includes"></a><h2>Includes</h2> <pre class="synopsis">#include <glib.h> </pre> </div> <div class="refsect1"> <a name="glib-Timers.description"></a><h2>Description</h2> <p><a class="link" href="glib-Timers.html#GTimer" title="GTimer"><span class="type">GTimer</span></a> records a start time, and counts microseconds elapsed since that time. This is done somewhat differently on different platforms, and can be tricky to get exactly right, so <a class="link" href="glib-Timers.html#GTimer" title="GTimer"><span class="type">GTimer</span></a> provides a portable/convenient interface.</p> </div> <div class="refsect1"> <a name="glib-Timers.functions_details"></a><h2>Functions</h2> <div class="refsect2"> <a name="g-timer-new"></a><h3>g_timer_new ()</h3> <pre class="programlisting"><a class="link" href="glib-Timers.html#GTimer" title="GTimer"><span class="returnvalue">GTimer</span></a> * g_timer_new (<em class="parameter"><code><span class="type">void</span></code></em>);</pre> <p>Creates a new timer, and starts timing (i.e. <a class="link" href="glib-Timers.html#g-timer-start" title="g_timer_start ()"><code class="function">g_timer_start()</code></a> is implicitly called for you).</p> <div class="refsect3"> <a name="g-timer-new.returns"></a><h4>Returns</h4> <p> a new <a class="link" href="glib-Timers.html#GTimer" title="GTimer"><span class="type">GTimer</span></a>.</p> </div> </div> <hr> <div class="refsect2"> <a name="g-timer-start"></a><h3>g_timer_start ()</h3> <pre class="programlisting"><span class="returnvalue">void</span> g_timer_start (<em class="parameter"><code><a class="link" href="glib-Timers.html#GTimer" title="GTimer"><span class="type">GTimer</span></a> *timer</code></em>);</pre> <p>Marks a start time, so that future calls to <a class="link" href="glib-Timers.html#g-timer-elapsed" title="g_timer_elapsed ()"><code class="function">g_timer_elapsed()</code></a> will report the time since <a class="link" href="glib-Timers.html#g-timer-start" title="g_timer_start ()"><code class="function">g_timer_start()</code></a> was called. <a class="link" href="glib-Timers.html#g-timer-new" title="g_timer_new ()"><code class="function">g_timer_new()</code></a> automatically marks the start time, so no need to call <a class="link" href="glib-Timers.html#g-timer-start" title="g_timer_start ()"><code class="function">g_timer_start()</code></a> immediately after creating the timer.</p> <div class="refsect3"> <a name="g-timer-start.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>timer</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-Timers.html#GTimer" title="GTimer"><span class="type">GTimer</span></a>.</p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> </div> <hr> <div class="refsect2"> <a name="g-timer-stop"></a><h3>g_timer_stop ()</h3> <pre class="programlisting"><span class="returnvalue">void</span> g_timer_stop (<em class="parameter"><code><a class="link" href="glib-Timers.html#GTimer" title="GTimer"><span class="type">GTimer</span></a> *timer</code></em>);</pre> <p>Marks an end time, so calls to <a class="link" href="glib-Timers.html#g-timer-elapsed" title="g_timer_elapsed ()"><code class="function">g_timer_elapsed()</code></a> will return the difference between this end time and the start time.</p> <div class="refsect3"> <a name="g-timer-stop.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>timer</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-Timers.html#GTimer" title="GTimer"><span class="type">GTimer</span></a>.</p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> </div> <hr> <div class="refsect2"> <a name="g-timer-continue"></a><h3>g_timer_continue ()</h3> <pre class="programlisting"><span class="returnvalue">void</span> g_timer_continue (<em class="parameter"><code><a class="link" href="glib-Timers.html#GTimer" title="GTimer"><span class="type">GTimer</span></a> *timer</code></em>);</pre> <p>Resumes a timer that has previously been stopped with <a class="link" href="glib-Timers.html#g-timer-stop" title="g_timer_stop ()"><code class="function">g_timer_stop()</code></a>. <a class="link" href="glib-Timers.html#g-timer-stop" title="g_timer_stop ()"><code class="function">g_timer_stop()</code></a> must be called before using this function.</p> <div class="refsect3"> <a name="g-timer-continue.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>timer</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-Timers.html#GTimer" title="GTimer"><span class="type">GTimer</span></a>.</p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <p class="since">Since: <a class="link" href="api-index-2-4.html#api-index-2.4">2.4</a></p> </div> <hr> <div class="refsect2"> <a name="g-timer-elapsed"></a><h3>g_timer_elapsed ()</h3> <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gdouble" title="gdouble"><span class="returnvalue">gdouble</span></a> g_timer_elapsed (<em class="parameter"><code><a class="link" href="glib-Timers.html#GTimer" title="GTimer"><span class="type">GTimer</span></a> *timer</code></em>, <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gulong" title="gulong"><span class="type">gulong</span></a> *microseconds</code></em>);</pre> <p>If <em class="parameter"><code>timer</code></em> has been started but not stopped, obtains the time since the timer was started. If <em class="parameter"><code>timer</code></em> has been stopped, obtains the elapsed time between the time it was started and the time it was stopped. The return value is the number of seconds elapsed, including any fractional part. The <em class="parameter"><code>microseconds</code></em> out parameter is essentially useless.</p> <div class="refsect3"> <a name="g-timer-elapsed.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody> <tr> <td class="parameter_name"><p>timer</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-Timers.html#GTimer" title="GTimer"><span class="type">GTimer</span></a>.</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>microseconds</p></td> <td class="parameter_description"><p>return location for the fractional part of seconds elapsed, in microseconds (that is, the total number of microseconds elapsed, modulo 1000000), or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a></p></td> <td class="parameter_annotations"> </td> </tr> </tbody> </table></div> </div> <div class="refsect3"> <a name="g-timer-elapsed.returns"></a><h4>Returns</h4> <p> seconds elapsed as a floating point value, including any fractional part.</p> </div> </div> <hr> <div class="refsect2"> <a name="g-timer-reset"></a><h3>g_timer_reset ()</h3> <pre class="programlisting"><span class="returnvalue">void</span> g_timer_reset (<em class="parameter"><code><a class="link" href="glib-Timers.html#GTimer" title="GTimer"><span class="type">GTimer</span></a> *timer</code></em>);</pre> <p>This function is useless; it's fine to call <a class="link" href="glib-Timers.html#g-timer-start" title="g_timer_start ()"><code class="function">g_timer_start()</code></a> on an already-started timer to reset the start time, so <a class="link" href="glib-Timers.html#g-timer-reset" title="g_timer_reset ()"><code class="function">g_timer_reset()</code></a> serves no purpose.</p> <div class="refsect3"> <a name="g-timer-reset.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>timer</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-Timers.html#GTimer" title="GTimer"><span class="type">GTimer</span></a>.</p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> </div> <hr> <div class="refsect2"> <a name="g-timer-destroy"></a><h3>g_timer_destroy ()</h3> <pre class="programlisting"><span class="returnvalue">void</span> g_timer_destroy (<em class="parameter"><code><a class="link" href="glib-Timers.html#GTimer" title="GTimer"><span class="type">GTimer</span></a> *timer</code></em>);</pre> <p>Destroys a timer, freeing associated resources.</p> <div class="refsect3"> <a name="g-timer-destroy.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>timer</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-Timers.html#GTimer" title="GTimer"><span class="type">GTimer</span></a> to destroy.</p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> </div> <hr> <div class="refsect2"> <a name="g-timer-is-active"></a><h3>g_timer_is_active ()</h3> <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> g_timer_is_active (<em class="parameter"><code><a class="link" href="glib-Timers.html#GTimer" title="GTimer"><span class="type">GTimer</span></a> *timer</code></em>);</pre> <p>Exposes whether the timer is currently active.</p> <div class="refsect3"> <a name="g-timer-is-active.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>timer</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-Timers.html#GTimer" title="GTimer"><span class="type">GTimer</span></a>.</p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-timer-is-active.returns"></a><h4>Returns</h4> <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if the timer is running, <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a> otherwise</p> </div> <p class="since">Since: <a class="link" href="api-index-2-62.html#api-index-2.62">2.62</a></p> </div> </div> <div class="refsect1"> <a name="glib-Timers.other_details"></a><h2>Types and Values</h2> <div class="refsect2"> <a name="GTimer"></a><h3>GTimer</h3> <pre class="programlisting">typedef struct _GTimer GTimer;</pre> <p>Opaque datatype that records a start time.</p> </div> </div> </div> <div class="footer"> <hr>Generated by GTK-Doc V1.32</div> </body> </html>