Difference between revisions of "Multi-threading: A brief introduction(多线程简介)"

From wiki.visual-prolog.com

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         ...</vip>
 
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Using anonymous predicates it is also very simple to transfer data to the new thread:
+
使用匿名谓词向新线程传递数据也很简单:
  
 
<vip>clauses
 
<vip>clauses
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         ...</vip>
 
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You can wait for thread termination, because a thread object is a synchronization object:
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可以等待线程结束,因为线程对象是同步对象:
  
 
<vip>clauses
 
<vip>clauses
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         SomeData = ...,
 
         SomeData = ...,
 
         T = thread::start( { :- myThreadWithData(SomeData) } ),
 
         T = thread::start( { :- myThreadWithData(SomeData) } ),
         ... % stuff done in parallel with T
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         ... % 与T并行着做某些工作
         T:wait(),  % Wait for T to terminate
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         T:wait(),  % 等待T结束
 
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Revision as of 03:23, 22 June 2015

(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。

线程是由 thread 类/接口表示的。创建一个新线程很简单:

clauses
        ...
        T = thread::start(myThread), % 启动一个新线程,这个线程执行谓词 myThread
        ...
 
predicates
    myThread : ().
clauses
   myThread() :-
        ...

使用匿名谓词向新线程传递数据也很简单:

clauses
        ...
        SomeData = ...,
        T = thread::start( { :- myThreadWithData(SomeData) }),
        ...
 
predicates
    myThreadWithData : (complexData ThreadInputData).
clauses
   myThreadWithData(ThreadInputData) :-
        ...

可以等待线程结束,因为线程对象是同步对象:

clauses
        ...
        SomeData = ...,
        T = thread::start( { :- myThreadWithData(SomeData) } ),
        ... % 与T并行着做某些工作
        T:wait(),  % 等待T结束
        ...

Thread safe acces to shared data can be done using monitors and/or synchronization objects like criticalSection, event, mutex and semaphore.

参考

Thread safety in Visual Prolog