<?xml version="1.0" encoding="utf-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"> <head> <meta http-equiv="content-type" content="application/xml+xhtml; charset=utf-8" /> <title>Logtalk built-in predicate: threaded_once/1</title> <link rel="stylesheet" href="../../screen.css" type="text/css" media="screen"/> <link rel="stylesheet" href="../../print.css" type="text/css" media="print"/> </head> <body> <div class="top-left">Logtalk reference manual</div> <div class="top-right">Built-in predicate: threaded_once/1</div> <div class="bottom-left"><span class="page"/></div> <div class="bottom-right"><span class="page"/></div> <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> <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> <div class="footer"> <div class="copyright"> <span>Copyright © <a href="mailto:pmoura@logtalk.org">Paulo Moura</a> — <a href="http://logtalk.org">Logtalk.org</a></span><br/> <span>Last updated on: May 26, 2007</span> </div> <div class="navbottom"> <span><a href="threaded_call1.html">previous</a> | <a href="../../glossary.html">glossary</a> | <a href="threaded_ignore1.html">next</a></span><br/> <span><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span> </div> </div> </body> </html>