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< title > Logtalk predicate directive: synchronized/1< / title >
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< div class = "top-right" > Predicate directive: synchronized/1< / div >
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< h2 id = "directives_synchronized1" class = "codenp" > synchronized/1< / h2 >
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< 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 >
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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. Synchronized predicates are silently compiled as normal predicates on Prolog compilers that don't support multi-threading programming.
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< / 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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