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Thread: How to abort a thread waiting on a lock???

  1. #1
    Join Date
    Apr 2004

    How to abort a thread waiting on a lock???

    I have a requirement wherin i have a timer which raises events in a timespan of 5 milliseconds..and i have got a pice of code in the timercallback which basically retrieves data from the database,updates a dictionary and gives it back to the UI for processing.

    Since the timeout is for 5 milliseconds,before finishing with the data loading part multiple threads seems to access the critical section(fetching data and updating dictionary) of the code.So,i did put a lock on the critical section and it works.But,my requirement is that i have to show the latest data on to the GUI,so i can ignore all the threads which are waiting on the lock till the lock aquired thread finishes processing.How should i tell all the threads which are waitng on a lock,not to wait on it but rather die itself??

  2. #2
    Join Date
    May 2007

    Re: How to abort a thread waiting on a lock???

    private bool updating;
    public void UpdateFromDatabase
        lock (whatever)
            if (updating)
            updating = true;
        updating = false;
    That'd do it fine.

    However, updating every 5ms from a database is insanity. No-one can process data which updates every 5ms. You're requirement might be to show the latest possible data, but updating every 2 seconds would be just as fast as updating every 5ms when a human is trying to look at the data. Even every 5 seconds would probably be fine.
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    NOTE: My code snippets are just snippets. They demonstrate an idea which can be adapted by you to solve your problem. They are not 100% complete and fully functional solutions equipped with error handling.

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