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Tasks not in Interrupt handler!



Hello
I hope this basic, but very CRITICAL questions don't bother the group. I have some idea, just need your approval.
 
Using RTLinux V1, please tell me:
 
How can we inssure that an interrupt-driven task is running _outside_ the scoop of the interrupt handler? Meaning that we can get more interrupts while executing the first task?
How can we be sure that the task is interrupt enabled, so get more interrupts while its execution?
What is an RTTASK priority in comparison to the interrupt handler ?
 
Thanx alot
maryam