[rtl] RTLinux concepts....

[James Cassidy <jcassidy@nova.genesoft.com>]

Hello Everyone,

I'd like to make certain that I've got a few concepts correct
when using the rtlinux functions.  I'd be grateful if someone
could let me know if I've got things straight.

If I want to have a rt fuction called *once* but at a specific
delay later, I do a:

      rt_task_init( &doOnceTask, doOnce, 1, 3000, 4 );
      rt_task_make_periodic( &doOnceTask, rt_get_time() + delay, somePeriod );


Then in the function to be called only once, at time now+delay:

      void once( int t ) { 
           // do something interesting....

           // stop and further invocations
           rt_task_suspend( &doOnceTask );

           rt_task_wait();
      }


Some questions...

Is this the best way to use the rt functions to have a function called
once, but at a precise time from now?

Is it ok to call rt_task_suspend from within the task that's being suspended?

Is the call to rt_task_wait not required?  If I've already suspended the
task, should I just return?	  

Does returning from a task implicitly do a suspend on that task?

If I have one task that's updating a variable for other tasks to use, what
functions are available for mutual exclusion?  	

Thanks for any info!
Jim.	



--- [rtl] ---
For more information on Real-Time Linux see:
http://www.rtlinux.org/