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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html><head>
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<title>liboop: on_time(), cancel_time()</title>
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<link rel="stylesheet" type="text/css" href="style.css">
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</head><body>
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<h2>on_time(), cancel_time()</h2>
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<pre>
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#include &lt;oop.h&gt;
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#include &lt;sys/time.h&gt;
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/* <em>Zero time, for scheduling an event immediately.</em> */
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static const struct timeval OOP_TIME_NOW = { 0, 0 };
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/* <em>Callback function prototype.</em> */
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typedef void *oop_call_time(oop_source *source,struct timeval tv,void *user);
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/* <em>Register and unregister time-triggered event sinks.</em> */
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void (*on_time)(oop_source *source,struct timeval tv,oop_call_time *call,void *user);
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void (*cancel_time)(oop_source *source,struct timeval tv,oop_call_time *call,void *user);
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</pre>
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<h3>Arguments.</h3>
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<dl>
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<dt><b>oop_source *source</b>
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<dd>The event source to register or unregister the event sink with.  This must
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be the same event source you got the function pointer from:
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"src-&gt;on_time(src,...);".<p>
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<dt><b>struct timeval tv</b>
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<dd>The time to wait for.  OOP_TIME_NOW (or any time in the past) will cause
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immediate scheduling.<p>
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<dt><b>oop_call_time *call</b>
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<dd>The callback function (event sink) to add (or remove).<p>
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<dt><b>void *user</b>
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<dd>User data passed through to the callback function.<p>
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</dl>
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<h3>Description.</h3>
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Note that these are not global functions, but function pointers supplied
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by the event source (in the <em>oop_source</em> structure) or by the user.
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<dl>
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<dt><b>on_time</b>
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<dd>After this function is called, when the event loop is running and the
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time <em>tv</em> is reached (or immediately upon entry to the event loop, if
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the specified time occurs in the past), the event source will call the function
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<em>call</em>, passing it a pointer to the event source, the scheduled time,
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and the same opaque <em>user</em> pointer passed to on_time.  This callback
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will only be called once.  Many callbacks may be registered for the same
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time.<p>
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<dt><b>cancel_time</b>
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<dd>Deactivate an event sink callback registered using on_time (above).  If the
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passed <em>tv</em>, <em>call</em> and <em>user</em> match a previously
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registered callback, it will be removed; if they match more than one, one of
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them will be removed; otherwise, no action is taken.<p>
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<dt><b>oop_call_time</b>
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<dd>Called when the event is triggered.  Performs a user_specific action.
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Should return OOP_CONTINUE if the event loop should continue operating; any
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other value (including OOP_HALT) will cause termination of the event loop.
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</dl>
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<hr><a href="ref">liboop reference</a></body></html>