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Thread: QThread set scheduling policy

  1. #1
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    Default QThread set scheduling policy

    Is it possible to set scheduling policy in Qthread ?
    Im using ubuntu, and I'm confident that qthreads are implemented using pthreads, but I don't know how to acces pthreads attribs for advanced tuning like setting scheduling policy.

    With posix classes I would use:
    Qt Code:
    1. #include <pthread.h>
    2. pthread_attr_t attrib;
    3. pthread_attr_init(&attrib);
    4. int ret = pthread_attr_setschedpolicy(&attrib, SCHED_RR);
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    but I don't figure out how to do this with Qthreads.

  2. #2
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    Default Re: QThread set scheduling policy

    You will have to patch Qt, more precisely QThread::start() in corelib/thread/qthread_unix.cpp

    Cheers,
    _

  3. #3
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    Default Re: QThread set scheduling policy

    thanks for the advice, although I'm in doubt about this: I wonder how to expose in QThread attrib struct. The regular way should be to provide an accessor to internal data. If I modify the start() call, I I have to pass as argument the attribs struct address, and inside the method start() i should manipulate the scheduler, that isn't correct from the encapsulation point of view. Isn't it?
    So, after this brainstorming, I can reformulate my question to you: how to modify qthread sources (POSIX part) in order to encapsulate the scheduling policies?

  4. #4
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    Default Re: QThread set scheduling policy

    Hmm, you could add another enum.

    Cheers,
    _

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