CODEWITHSUNDEEP
c#.netmultithreadingtask-parallel-libraryasync-await
avo
avo

Reputation: 10721

StaTaskScheduler and await continuation

I'm using Stephen Toub's StaTaskScheduler for the reason described here.

As far as I understand, task scheduling is the responsibility of Task Scheduler, while await continuation is the responsibility of Synchronization Context (please correct me if I'm wrong).

Now I want to use await inside my task code running on one of the STA threads, created by StaTaskScheduler. Should I install a custom Synchronization Context, to make sure the code execution will be continued on the same STA thread after await?

Upvotes: 3

Views: 896

Answers (1)

Stephen Cleary
Stephen Cleary

Reputation: 457217

I cover the await behavior in my intro to async blog post.

By default, await will capture the current SynchronizationContext unless it is null, in which case it will capture the current TaskScheduler.

So, the answer is no, you do not need to install a custom SynchronizationContext. When used inside a task executed by StaTaskScheduler, await will by default capture that task scheduler and resume on another task executed by that StaTaskScheduler.

Note that StaTaskScheduler does maintain a collection of STA threads, and the continuation may execute on any of those threads. If this is unacceptable, you'll need to limit the StaTaskScheduler to a single thread (by passing 1 to its constructor).

Upvotes: 5

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