66 lines
3.4 KiB
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66 lines
3.4 KiB
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<title>Logtalk built-in predicate: threaded_call/2</title>
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<div class="top-left">Logtalk reference manual</div>
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<div class="top-right">Built-in predicate: threaded_call/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 class="codenp">threaded_call/2<span id="builtins_threaded_call2"/></h2>
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<h4>Description</h4>
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<pre>threaded_call(Goal, Options)
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threaded_call((Goal1, Goal2, ...), Options)
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threaded_call((Goal1; Goal2; ...), Options)</pre>
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<p>
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Prove <code>Goal</code> using a new thread. By default, the proof is done asynchronously. The argument can be a message sending. The result (success, failure, or exception) is sent back to the thread of the object containing the call (<em>this</em>). The option <code>noreply</code> may be used when no reply with the proof results is necessary. The option <code>atomic</code> may be used if the goal has side-effects such as dynamic database updates or input-output operations; this option is only safe if the side-effects are confined to the object where the goal is proved (or to the object receiving the asynchronous message).
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</p>
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<p>
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When the argument is a <em>conjunction</em> of goals, the call is equivalent the conjunction of calls of the individual goals. However, when the argument is a <em>disjunction</em> of goals, the call is equivalent to the <em>competing</em> calls of the individual goals: when one of the goals complete, the other ones are aborted (i.e. their threads are terminated). In this case, the corresponding <code>threaded_exit/1-2</code> goal <strong>must</strong> match all the goals in the disjunction. This is useful when you have a set of different methods to solve a problem without knowing a priori which one will lead to the fastest result.
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</p>
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<h4>Template and modes</h4>
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<pre>threaded_call(+callable, +list)</pre>
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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_call(Goal, Options)</code></dd>
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<dt>Send an asynchronous message to <em>self</em>:</dt>
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<dd><code>threaded_call(::Message, Options)</code></dd>
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<dt>Send an asynchronous message to an object:</dt>
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<dd><code>threaded_call(Object::Message, Options)</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: October 26, 2006</span>
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<span><a href="threaded_call1.html">previous</a> | <a href="../../glossary.html">glossary</a> | <a href="threaded_exit1.html">next</a></span><br/>
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