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<div class="top-left">Logtalk reference manual</div> 
<div class="top-right">Built-in predicate: threaded_once/1</div>
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<h2 id="builtins_threaded_once1" class="codenp">threaded_once/1</h2>

<h4>Description</h4>

<pre>threaded_once(Goal)</pre>
<p>
Proves <code>Goal</code> asynchronously using a new thread. Only the first goal solution is found. The argument can be a message sending goal. This call always succeeds. The result (success, failure, or exception) is sent back to the message queue of the object containing the call (<em>this</em>).
</p>

<h4>Template and modes</h4>

<pre>threaded_once(@callable)</pre>

<h4>Errors</h4>

<dl>
	<dt>Goal is a variable:</dt>
		<dd><code>instantiation_error</code></dd>
	<dt>Goal is neither a variable nor a callable term:</dt>
		<dd><code>type_error(callable, Goal)</code></dd>
</dl>

<h4>Examples</h4>

<dl>
	<dt>Prove <code>Goal</code> asynchronously in a new thread:</dt>
		<dd><code>threaded_once(Goal)</code></dd>
	<dt>Prove <code>::Message</code> asynchronously in a new thread:</dt>
		<dd><code>threaded_once(::Message)</code></dd>
	<dt>Prove <code>Object::Message</code> asynchronously in a new thread:</dt>
		<dd><code>threaded_once(Object::Message)</code></dd>
</dl>

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		<span>Last updated on: May 26, 2007</span>
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