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<title>Logtalk predicate directive: synchronized/1</title>
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<div class="top-left">Logtalk reference manual</div>
<div class="top-right">Predicate directive: synchronized/1</div>
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<h2 class="codenp">synchronized/1<span id="directives_synchronized1"/></h2>
<h4>Description</h4>
<pre>synchronized(Functor/Arity)
synchronized(Functor1/Arity1, Functor2/Arity2, ...)
synchronized([Functor1/Arity1, Functor2/Arity2, ...])
synchronized(Functor//Arity)
synchronized(Functor1//Arity1, Functor2//Arity2, ...)
synchronized([Functor1//Arity1, Functor2//Arity2, ...])</pre>
<p>
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.
</p>
<h4>Template and modes</h4>
<pre>synchronized(+predicate_indicator_term)
synchronized(+non_terminal_indicator_term)</pre>
<h4>Examples</h4>
<pre>:- synchronized(db_update/1).
:- synchronized(write_stream/2, read_stream/2).
:- synchronized([add_to_queue/2, remove_from_queue/2]).</pre>
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