|
Hi,
I've few doubts the pre-emption capabilities
of RT-Linux. If a periodic task of Computation time C and period P. Then,
in case C>P, then does the RT-Linux scheduler pre-empt the over-running task
pre-empt and schedule other tasks.
I'm asking this because an explicit call is made o
pthread_wait_np() function which schedules it.
I can summarize my problem like this :
Let my task1 program be :
while(1)
{
pthread_wait_np();
while(1)
{
// I won't
put any pthread_wait_np() here but can the scheduler interrupt me???
rtl_printf("Task1");
}
}
Let my task2 program be :
while(1)
{
pthread_wait_np();
while(1)
{
// I won't
put any pthread_wait_np() here but can the scheduler interrupt me???
rtl_printf("Task2");
}
} I expected an output of "Task1" and "task2"
interchangeably.
I modified the examples/hello.c to put this code
and found that my system crashed and didn't do anything else.
Am I doing somehing wrong ? ( I know that if I put
pthread_wait_np() in inner loop, it will work- but that doesn't explain the
preemption capabilites of RT-Linux).
Expecting your reply,
Thanking in advance,
Swaminathan
------------------------------------------------------------------------------------
Swaminathan Sivasubramanian http://www.swaminathans.com Learn from the mistakes of others -- you can't live long enough to make them all yourself. |
