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interrupts and scheduling


Hello,

We have two interrupts one at every .5msecs(INT1) and
other every 1 msec(INT2).

In our application we have two threads. When INT1 is
enabled/handled the scheduler is not able to schedule
the threads.

Where as when only INT2 is enabled both the threads
get scheduled.

We have tried this using mlq and bit-map. But found
threads scheduling not working when INT1 is enabled.

The INT1 ISR routine execution time taken is 1.3
micro-secs.

The processor ( sparc) runs at 32-MHz.

What could be the possible issue?. How do we go about
debugging the same?.

-Thanks for your time.
harish



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