Re: On thread scheduling

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On Sep 14, 2007, at 18:40:00, Heikki Orsila wrote:
Consider a simple embedded system:

void interrupt_handler(void)
int main(void)

I would like to "emulate" this system with a workstation to make development faster. I would create two threads, one executing the main() function, and the other occasionally calling interrupt_handler(). Before interrupt_handler() is called, the main () thread should be stopped asynchronously.
Actually you probably just want to do this with an ordinary single-
threaded program. Just do your main() thing normally and schedule a
signal-based timer at program start (or whenever you actually set up
your periodic interrupt source); the timer signal-handler will act
as the interrupt handler. Alternatively you could have 2 threads
where the *only* thing the second thread does is a timed poll() loop
on an FD where it reads commands from the main thread. When the main
thread wants to change the interval-between-interrupts or some other
interrupt configuration it writes the info down the FD to the
alternate thread which actually sets up the change. The main program
then continues running and periodically receives its SIGUSR1 or
whatever from the other thread and uses that as the interrupt.
Kyle Moffett

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