Implementing multi-threading in workflows

I'm aware a single workflow instance run in a single thread at a time. I've a workflow with two receive activities inside a pick activity. Message correlation is implemented to make sure the requests to both the activities should be routed to the same instance.

In the first receive branch I've a parallel activity with a delay activity in one branch. The parallel activity will complete either the delay is over or a flag is set to true.

When the parallel activity is waiting for the 开发者_StackOverflow中文版condition to meet how I can receive calls from the second receive activity? because the flag will be set to true only through through it's branch. I'm waiting for your suggestions or ideas.

Check out my blog The Workflow Parallel Activity and Task Parallelism This will help you understand how WF works

Not quite sure what you are trying to achieve here.

If you have a Pick with 2 branched and both branches contain a Receive it will continue after you receive either of the 2 messages the 2 Receive activities are waiting for. The other will be canceled and not receive anything. The fact that one Receive is in a Parallel will not make a difference here. So unless this is on a loop you will not receive more than one WCF message in your workflow.