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6.2

Multi-Threading in a Windows Service

Asked by briankrebs in Microsoft Visual Basic.Net

Tags: service, thread, windows

Hi everyone,

More or less what I'm doing is fetching all records from a table called Mailboxes every 30 seconds (using a System.Timers.Timer) and performing the same exact db operations on each.  The problem is, for some mailboxes the operations can take a long time, so long that they are still running when the timer elapses again.  This has caused some strange problems in the backend.

What I want to do now is have a certain number of threads running concurrently, each processing only 1 mailbox at a time.  When processing is complete on one mailbox, I want the thread to fire off an event letting the main thread know it can start processing the next mailbox in queue, until all mailboxes are processed.

The processing itself is encapsulated in a single class with 2 properties, which must be set before starting the thread, a method that should be passed as the delegate to the worker thread, and an event called FinishedProcessing with one argument, which is the mailbox that has finished processing.

I have some code in place, but I can't figure out how to let a worker thread sleep once processing is complete, and then have the main thread reuse that worker thread to process the next mailbox in queue.  What is the best way to accomplish this?

Thanks in advance,

Brian
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Zone: Microsoft Visual Basic.Net
Tags: service, thread, windows
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Solution Provided By: WorkingJourneyman
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Solution Grade: A
 
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