c++ multithreaded task queue for scheduled tasks

I need to develop a module which will execute scheduled tasks.

Each task is scheduled to be executed within X milliseconds.

The module takes as a parameter an amount of worker threads to execute the tasks.

The tasks are piled up in a queue which will probably be a priority queue, so a thread checks for the next-in-queue task (the one w开发者_如何转开发ith the lowest "redemption" time), thus there's no need to iterate through all tasks each time.

Is there any public library that does that or shall I roll my own?

Note: I'm using VC2008 on Windows.

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If you don't mind a Boost dependency, threadpool might fit your needs.

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Take a look at TBB - Intel Threading Building Blocks.

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Just to add a little information to your question, what you're asking for is a real-time scheduler that uses the Earliest Deadline First algorithm. Also note that without OS support, you can't guarantee that your program will work in that X millisecond deadline you assign it. The OS could always decide to swap your task off its CPU in the middle of the job, making it take an unpredictably-long time to complete.

If your application critically depeneds on the task being done in the X milliseconds you set for it (or something blows up), you'll need to be running a real-time operating system, not regular Windows.