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+<title>Sly: Agendas</title>
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+<a name="Agendass"></a>
+<div class="header">
+<p>
+Previous: <a href="Coroutines.html#Coroutines" accesskey="p" rel="prev">Coroutines</a>, Up: <a href="Time.html#Time" accesskey="u" rel="up">Time</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html#Index" title="Index" rel="index">Index</a>]</p>
+</div>
+<hr>
+<a name="Agendas-1"></a>
+<h4 class="subsection">4.3.3 Agendas</h4>
+
+<div class="example">
+<pre class="example">(use-modules (sly agenda))
+</pre></div>
+
+<p>Agendas are used to schedule procedures to be called at distinct
+points in time.  One agenda, stored in the <code>current-agenda</code>
+parameter, is active at any given time.  A global agenda is initially
+bound and is sufficient for most needs.  When a separate scheduler is
+required (see <a href="REPL.html#REPL">REPL</a> for one such case), the parameter can be
+rebound using <code>parameterize</code> or <code>with-agenda</code> form.
+</p>
+<dl>
+<dt><a name="index-make_002dagenda"></a>Scheme Procedure: <strong>make-agenda</strong></dt>
+<dd><p>Create a new, empty agenda.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-agenda_003f"></a>Scheme Syntax: <strong>agenda?</strong> <em><var>obj</var></em></dt>
+<dd><p>Return <code>#t</code> if <var>obj</var> is an agenda.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-current_002dagenda"></a>Scheme Variable: <strong>current-agenda</strong></dt>
+<dd><p>A parameter containing the current, dynamically scoped agenda object.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-agenda_002dtime"></a>Scheme Procedure: <strong>agenda-time</strong></dt>
+<dd><p>Return the time of the current agenda.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-with_002dagenda"></a>Scheme Syntax: <strong>with-agenda</strong> <em><var>agenda</var> <var>body</var> &hellip;</em></dt>
+<dd><p>Evaluate <var>body</var> with <code>current-agenda</code> bound to <var>agenda</var>.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-agenda_002dtick_0021"></a>Scheme Procedure: <strong>agenda-tick!</strong></dt>
+<dd><p>Increment time by 1 for the current agenda and run scheduled
+procedures.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-agenda_002dclear_0021"></a>Scheme Procedure: <strong>agenda-clear!</strong></dt>
+<dd><p>Remove all scheduled procedures from the current agenda.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-schedule"></a>Scheme Procedure: <strong>schedule</strong> <em><var>thunk</var> [<var>delay</var>]</em></dt>
+<dd><p>Schedule <var>thunk</var> to be applied after <var>delay</var> ticks of the
+current agenda.  The default <var>delay</var> is one tick.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-schedule_002dinterval"></a>Scheme Procedure: <strong>schedule-interval</strong> <em><var>thunk</var> <var>interval</var></em></dt>
+<dd><p>Schedule <var>thunk</var> to be applied every <var>interval</var> ticks of the
+current agenda, forever.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-schedule_002deach"></a>Scheme Procedure: <strong>schedule-each</strong> <em><var>thunk</var></em></dt>
+<dd><p>Schedule <var>thunk</var> to be applied upon every tick of the current
+agenda, forever.
+</p></dd></dl>
+
+<p><a href="Coroutines.html#Coroutines">Coroutines</a> become particularly useful for game programming when
+combined with the agenda.  For example, a computer controller opponent
+could periodically pause its AI algorithm to give the rest of the game
+world a chance to do some processing.  By using the <code>wait</code>
+procedure, algorithms that span multiple ticks of game time can be
+written in a straightforward, natural way.
+</p>
+<dl>
+<dt><a name="index-wait"></a>Scheme Procedure: <strong>wait</strong> <em><var>delay</var></em></dt>
+<dd><p>Abort the current coroutine prompt and schedule the continuation to be
+run after <var>delay</var> ticks of the current agenda.
+</p></dd></dl>
+<hr>
+<div class="header">
+<p>
+Previous: <a href="Coroutines.html#Coroutines" accesskey="p" rel="prev">Coroutines</a>, Up: <a href="Time.html#Time" accesskey="u" rel="up">Time</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html#Index" title="Index" rel="index">Index</a>]</p>
+</div>
+
+
+
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