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

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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>.
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要使线程安全访问共享的数据,可以使用 [[Language Reference/Monitors|monitors]] /或同步对象如: <vp>criticalSection</vp><vp>event</vp><vp>mutex</vp> <vp>semaphore</vp>
  
 
=== 参考 ===
 
=== 参考 ===

Latest revision as of 03:29, 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
        ...

要使线程安全访问共享的数据,可以使用 monitors 和/或同步对象如: criticalSectioneventmutexsemaphore

参考

Thread safety in Visual Prolog