Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
565 views
in Technique[技术] by (71.8m points)

c# - Why no AutoResetEventSlim in BCL?

Why isn't there an AutoResetEventSlim class in BCL?

Can it be simulated using ManualResetEventSlim?

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

ManualResetEvent and ManualResetEventSlim both are designed so that they remained signaled after calling. This is typically for a very different scenario than AutoResetEvent.

AutoResetEvent immediately returns to the unsignaled state after usage, which is typically used for a different set of scenarios. From AutoResetEvents documentation:

Typically, you use this class when threads need exclusive access to a resource.

ManualResetEvent (and Slim) are typically used, however, for a scenario where:

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

Since AutoResetEvent is most commonly used in scenarios where there are multiple threads sharing a resource, wait times typically would not be extremely short. ManualResetEventSlim, however, is really only intended when you know, in advance, the wait time is very short. If your wait time is not going to be very short, then you should use ManualResetEvent instead. See the documentation on the difference between MRE and MRES for details.

When your wait times are longer (which would be the normal scenario with AutoResetEvent), the "slim" version is actually worse, as it reverts to using a wait handle.


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

1.4m articles

1.4m replys

5 comments

57.0k users

...