[Xenomai-help] Re: [Xenomai-core] aperiodic xenomai tasks

[Jan Kiszka <jan.kiszka@domain.hid>]

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mani bhatti wrote:
> Thanks Jan for your reply
> Actually the semaphore and mutexes stuff you have referred to i have
> already grounds for them.The only problem i have is please some body
> tell me that i dont want to make a thread periodic i,e i dont want to
> call a thread after periodic time interval i wanted it to  make it
> aperiodic like threads in C++ are scheduled by scheduler byitself

This has nothing to do with C++, rather with the class library you are
used to.

> and sleep on waiting condition with out any specific time interval
> and wake  only when  signalled from  pariodic thread. I hope you
> understand my point.Thanks a lot .

Let's try it differently:

thread_a()
{
	rt_task_set_periodic(...);
	while (1) {
		rt_task_wait_period(NULL);
		/* do some work */
		if (I_should_trigger_thread_b)
			rt_sem_v(&sem);
	}
}

thread_b()
{
	while (1) {
		rt_sem_p(&sem, TM_INFINITE);
		/* so some other work */
	}
}

Again, read up what the services are exactly doing or you will be lost
once you have to modify things only slightly.

Jan


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