Question

为什么没有这样的编号? AutoResetEventSlim category in BCL?

能否使用<代码>ManualResetEventSlim加以模拟?

Answer 1

www.un.org/Depts/DGACM/index_spanish.htm 两者都是为了在发出呼吁后保持信号。通常的情况与<代码>不同。 AutoResetEvent。

AutoResetEvent在使用后立即返回未签字国,通常用于不同的假设情景。 From AutoReset 活动文件:

通常,当表面需要完全获得资源时,你使用这一类别。

<代码>ManualResetEvent(和Slim)通常用于下列情况:

this communication concerns a task which one thread must complete before other threads can proceed.

由于<代码>AutoResetEvent最常用的假设情景是,在资源共享方面有多个线索,等候时间通常不会太短。但是,只有当你事先知道等候时间非常短时,才真正打算使用“ManualResetEventSlim。如果您的等待时间不会太短,那么你就应当使用<代码>ManualResetEvent。 See the documentation on the difference between MRE and MRES for details.

当您的等待时间较长时(这将是的正常情况),“气候”一词实际上就更糟,因为它再次使用等待处理。

Answer 2

I was bugged by this fact as well. However, it appears that you can simulate an AutoResetEvent(Slim) using a simple SemaphoreSlim with a special configuration:

SemaphoreSlim Lock = new SemaphoreSlim( 1, 1 );

In the constructor, the first parameter defines the initial state of the semaphore: 1 means that one thread may enter, 0 that the semaphore has to be released first. So new AutoResetEvent( true ) translates to new SemaphoreSlim( 1, 1 ) and new AutoResetEvent( false ) translates to new SemaphoreSlim( 0, 1 ) respectively.

第二项参数界定了可能同时进入ema体的深层的最大数量。编号为1 请将其作为<条码>行事。 AutoResetEvent。

One other nice thing about the SemaphoreSlim is that with the new async/await pattern in 4.5 the class has received a .WaitAsync() method which can be awaited. So there is no need to manually create an awaitable wait primitive in this case any more.

Hope this helps.

Answer 3

引用Microsoft scott Phillips(:

As for AutoResetEventSlim.. is there a scenario for which you need it? Truth be told, creating an AutoResetEvent is quite difficult and the use cases are very limited so we prioritized our efforts elsewhere. If there s a real need for you to have one, I d love to hear it so we could consider creating one!

扩大评论:你只能使用手工活动,确保总是在等待后重新开始。

如果等待和重新确定之间的这种小的拖延造成问题,可能有一些根本问题。例如,如果存在多个消费者,而且你只能让自己来做,那么,一项活动可能就没有合适的工作工具,你应考虑<代码>。 SemaphoreSlim 或甚至仅限原始<代码>。

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