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Date:	Sat, 15 Sep 2007 07:39:13 +0200
From:	Matthias Kaehlcke <>
To:	Heikki Orsila <>
Cc:	Linux Kernel Mailing List <>
Subject: Re: On thread scheduling

El Sat, Sep 15, 2007 at 01:40:00AM +0300 Heikki Orsila ha dit:

> 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.
> I looked into pthreads documentation and found only pthread_kill(thread, 
> SIGTSTP) to do asynchronous stop, but then I also have to play terminal 
> tricks to avoid problems..
> Is there are function to just disable scheduling of a single thread 
> without having other side-effects (such as terminal stuff)? Functions 
> like pthread_disable_scheduling(thread) and 
> pthread_enable_scheduling(thread) would be good for this..

i wonder if assigning a real time priority with
pthread_setschedparam() to the caller of your interrupt_handler()
function would solve your problem. this way the main() thread is never
scheduled when the interrupt_handler() thread is
runnable. interrupt_handler() should be as short as possible,
otherwise you risk starving of the rest of your systems processes.

Matthias Kaehlcke
Linux Application Developer

        Representation of the world, like the world itself, is
        the work of men; they describe it from their own point
         of view, which they  confuse with the absolute truth
                          (Simone de Beauvoir)
    using free software / Debian GNU/Linux |  : :'  :
                                                                `. `'`
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