C＃的锁，听的CancellationToken [英] c# lock and listen to CancellationToken

问题描述

我想用锁或类似的同步，以保护关键的部分。同时，我要听的CancellationToken。

现在，我用这样的互斥体，但互斥体不具有相同的良好性能。我可以使用，而不是互斥的任何其他同步类（包括新的.NET 4.0）的？

  WaitHandle.WaitAny（新[] {CancelToken.WaitHandle，_mutex}）;
CancelToken.ThrowIfCancellationRequested（）;
 

解决方案

看看新的 .NET 4.0框架功能的SemaphoreSlim类的。它提供了<一个href="http://msdn.microsoft.com/en-us/library/dd321647.aspx">SemaphoreSlim.Wait(CancellationToken)方法。

  

阻止当前线程，直到它可以进入SemaphoreSlim，而   观察的CancellationToken

从某些角度来看使用旗语在这种简单的情况可能是负担，因为它最初的目的是要为多个线程访问，但也许你会发现它是有用的。

编辑：code段

 的CancellationToken令牌=新的CancellationToken（）;
SemaphoreSlim信号=新SemaphoreSlim（1,1）;

尝试 {
   //其他线程块段入口
   semaphore.Wait（标记）;

   //临界区code
   // ...
   如果（token.IsCancellationRequested）
   {
       // ...
   }
}
最后 {
   semaphore.Release（）;
}
 

I want to use lock or a similar synchronization to protect a critical section. At the same time I want to listen to a CancellationToken.

Right now I'm using a mutex like this, but mutex doesn't have as good performance. Can I use any of other synchronization classes (including the new .Net 4.0) instead of the mutex?

WaitHandle.WaitAny(new[] { CancelToken.WaitHandle, _mutex});
CancelToken.ThrowIfCancellationRequested();

解决方案

Take a look at the new .NET 4.0 Framework feature SemaphoreSlim Class. It provides SemaphoreSlim.Wait(CancellationToken) method.

Blocks the current thread until it can enter the SemaphoreSlim, while observing a CancellationToken

From some point of view using Semaphore in such simple case could be an overhead because initially it was designed to provide an access for multiple threads, but perhaps you might find it useful.

EDIT: The code snippet

CancellationToken token = new CancellationToken();            
SemaphoreSlim semaphore = new SemaphoreSlim(1,1);

try {
   // block section entrance for other threads
   semaphore.Wait(token);

   // critical section code
   // ...
   if (token.IsCancellationRequested)
   {
       // ...
   }
}
finally { 
   semaphore.Release();
}

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