Please reply always to kernelnewbies. On Nov 27, 2016 11:09 AM, "Ricardo Biehl" <rbpoficial@gmail.com> wrote:

2016-11-27 16:01 GMT-02:00, Joel Fernandes <agnel.joel@gmail.com>:

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On Nov 27, 2016 9:44 AM, "Ricardo Biehl" <rbpoficial@gmail.com> wrote:

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As a question I've made on Stackexchange <

http://stackoverflow.com/questions/40579919/how-many-time-to-be-context-swit...

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I'm developing a real-time program where scheduler's context-switches might interfere its performance. --- Suppose I need to do many consecutive (but optional) operations (I mean I'm able to cancel some of them) of the same type in every execution of a timer-oriented signal handler. Could I check how much time left until my thread get context-switched? [...] and then I can cancel/jump some operations for a better performance at all.

If yes, how can I do it (in C code)?

If you use SCHED_FIFO, then at the right RT priority level, you should not context switch anyway. Time quantas apply only to regular CFS tasks or when RT throttling is activated.

Also note that interrupts and softirqs cause variability and interruptions no matter what you do or how you schedule.

J.

Thank you Joel!

Another small question: Can I use pthread_cond_signal[broadcast]() (a non async-signal-safe function) inside signal handler, given I know pthread_cond_wait() hasn't been called at the same time?

Should be, as per docs it wakes up *IF* any threads are blocked on cond. Thanks, Joel

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Huge thanks!

-- Ricardo Biehl Pasquali

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-- Ricardo Biehl Pasquali