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<title>Logtalk predicate directive: synchronized/1</title>
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<div class="top-left">Logtalk reference manual</div>
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<div class="top-right">Predicate directive: synchronized/1</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#directives">directives</a></div>
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<h2 id="directives_synchronized1" class="codenp">synchronized/1</h2>
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<h4>Description</h4>
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<pre>synchronized(Functor/Arity)
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synchronized(Functor1/Arity1, Functor2/Arity2, ...)
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synchronized([Functor1/Arity1, Functor2/Arity2, ...])
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synchronized(Functor//Arity)
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synchronized(Functor1//Arity1, Functor2//Arity2, ...)
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synchronized([Functor1//Arity1, Functor2//Arity2, ...])</pre>
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<p>
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Declares synchronized predicates and synchronized grammar rule non-terminals. A synchronized predicate (or synchronized non-terminal) is protected by a mutex in order to allow for thread synchronization when proving a call to the predicate (or non-terminal). All predicates declared in the same synchronized directive share the same mutex. In order to use a separate mutex for each predicate (so that they are independently synchronized), a per-predicate synchronized directive must be used.
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</p>
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<p>
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Synchronized predicates are silently compiled as normal predicates when using back-end Prolog compilers that don't support multi-threading programming.
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</p>
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<h4>Template and modes</h4>
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<pre>synchronized(+predicate_indicator_term)
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synchronized(+non_terminal_indicator_term)</pre>
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<h4>Examples</h4>
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<pre>:- synchronized(db_update/1).
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:- synchronized(write_stream/2, read_stream/2).
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:- synchronized([add_to_queue/2, remove_from_queue/2]).</pre>
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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: January 2, 2007</span>
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