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76 lines
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76 lines
3.0 KiB
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<title>Logtalk built-in predicate: threaded_once/1-2</title>
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</head>
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<body>
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<div class="top-left">Logtalk reference manual</div>
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<div class="top-right">Built-in predicate: threaded_once/1-2</div>
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<div class="bottom-left"><span class="page"/></div>
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<div class="bottom-right"><span class="page"/></div>
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<div class="navtop"><a href="../../index.html">contents</a> > <a href="../index.html">reference manual</a> > <a href="../index.html#builtins">built-in predicates</a></div>
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<h2 id="builtins_threaded_once1_2" class="codenp">threaded_once/1-2</h2>
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<h4>Description</h4>
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<pre>threaded_once(Goal)
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threaded_once(Goal, Tag)</pre>
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<p>
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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>).
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</p>
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<p>
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The variant <code>threaded_once/2</code> returns a threaded call identifier tag that can be used with the <a title="Consult reference manual" href="threaded_exit1_2.html"><code>threaded_exit/2</code></a> predicate. Tags shall be considered as an opaque term; users shall not rely on its type.
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</p>
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<h4>Template and modes</h4>
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<pre>threaded_once(@callable)
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threaded_once(@callable, -nonvar)</pre>
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<h4>Errors</h4>
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<dl>
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<dt>Goal is a variable:</dt>
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<dd><code>instantiation_error</code></dd>
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<dt>Goal is neither a variable nor a callable term:</dt>
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<dd><code>type_error(callable, Goal)</code></dd>
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<dt>Tag is not a variable:</dt>
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<dd><code>type_error(variable, Goal)</code></dd>
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</dl>
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<h4>Examples</h4>
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<dl>
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<dt>Prove <code>Goal</code> asynchronously in a new thread:</dt>
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<dd><code>threaded_once(Goal)</code></dd>
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<dt>Prove <code>::Message</code> asynchronously in a new thread:</dt>
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<dd><code>threaded_once(::Message)</code></dd>
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<dt>Prove <code>Object::Message</code> asynchronously in a new thread:</dt>
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<dd><code>threaded_once(Object::Message)</code></dd>
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</dl>
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<div class="footer">
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<div class="copyright">
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<span>Copyright © <a href="mailto:pmoura@logtalk.org">Paulo Moura</a> — <a href="http://logtalk.org">Logtalk.org</a></span><br/>
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<span>Last updated on: September 15, 2007</span>
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