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Asynchronous Services

Posted on 1998-09-28
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Last Modified: 2013-11-20
I need to provide asynchronous services inside a DLL (e.g. some functions execute in the background and post a completion event to the owner).  Requests from the application should be queued to shared memory and executed by the DLL FIFO.

I realize I can do this using memory-mapped files and a "shared memory manager" should handle the requests and forward them to the DLL service.  Due to my inexperience with such architectures, I only have a vague idea on a possible implementation.

Anyone out there who did a similar project? Books (Windows or MFC), links, and other references are welcome!

P.S. Specifically, I am doing a WOSA/XFS service provider.
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Question by:ealva
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rajesh032097 earned 1200 total points
ID: 1322664
I assume you are talking about NT since it is much easier to do what you want on NT. In that case you can refer to book "Advanced Windows" specifically chapter on device I/O. It describes usage of I/O completion ports to write services. You should write a COM object which the the application will create and then call it's methods. Inside the COM object, you can create a pool of threads and make them wait for client requests using the I/O completion ports architecture. You can pass a callback interface pointer to this object which it can use to report back completion of work. If you describe in more detail about exact scenario, I can give you more info.

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by:ealva
ID: 1322665
Sorry for the delay.  Anyway, thanks for the info.
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