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（以下内容译自[[:Category:Tutorials]]中的Multi-threading: A brief introduction。）

只有 ''''商业版'''' 才支持多线程应用。

Threads are represented by the <vp>thread</vp> class/interface.  And it is very simple to create a new thread:

<vip>clauses
        ...
        T = thread::start(myThread), % start a new thread which executes the predicate myThread
        ...

predicates
    myThread : ().
clauses
   myThread() :-
        ...</vip>

Using anonymous predicates it is also very simple to transfer data to the new thread:

<vip>clauses
        ...
        SomeData = ...,
        T = thread::start( { :- myThreadWithData(SomeData) }),
        ...

predicates
    myThreadWithData : (complexData ThreadInputData).
clauses
   myThreadWithData(ThreadInputData) :-
        ...</vip>

You can wait for thread termination, because a thread object is a synchronization object:

<vip>clauses
        ...
        SomeData = ...,
        T = thread::start( { :- myThreadWithData(SomeData) } ),
        ... % stuff done in parallel with T
        T:wait(),  % Wait for T to terminate
        ...</vip>

Thread safe acces to shared data can be done using [[Language Reference/Monitors|monitors]] and/or synchronization objects like <vp>criticalSection</vp>, <vp>event</vp>, <vp>mutex</vp> and  <vp>semaphore</vp>.

=== 参考 ===

[[Thread safety in Visual Prolog]]

[[Category:Tutorials部分中文译文]]

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