PostTaskAndReply Pattern for BlockingPool Tasks?

[Mike Rossetti]

I've got some database update code that is using PostSequencedWorkerTask(...) calls for queuing up the various database updates.

Is there a pattern for notifying the posting thread (i.e. the main thread) that kicked off all of these updates once all of them have completed? Something similar to PostTaskAndReply?

What I'd like to do is to queue up all of these sequenced tasks and then post one final sequenced task that then does the reply call back to the main thread.

All advice will be appreciated!

Mike

[William Chan (陈智昌)]

The blocking pool is a derived class of TaskRunner which provides a PostTaskAndReply() member function. You can probably build on top of this by having the reply closures share the necessary state (a counter or whatever) and run another closure when all the reply closures have completed.

Mike

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[William Chan (陈智昌)]

Oh, I see now that you're using sequenced tasks. You can get a SequencedTaskRunner from the SequencedWorkerPool::GetSequencedTaskRunner(SequencedToken) member function. SequencedTaskRunner, as a derived class of TaskRunner, has a PostTaskAndReply() member function.

[Darin Fisher]

... and you can fire off an additional PostTaskAndReply that will be guaranteed to run after all of the other tasks have run.  This might be easier than maintaining a counter.

-Darin

[Mike Rossetti]

Awesome! Thanks William and Darin! I'll grab a runner and use the PostTaskAndReply. Slick.

Mike