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List:       linux-newbie
Subject:    Wait queues and scheduling
From:       Peter STIEGLITZ <peter.stieglitz () st ! com>
Date:       2004-10-19 14:24:41
Message-ID: 004901c4b5e7$5f789f70$340d81a4 () benin
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Folks,
I have a little question about scheduling.

If I have two waiting processes running in the context of the kernel on a wait queue \
(as a result of a blocked read). A high priority process is first in the wait queue \
and a low priority last in queue. An interrupt occurs and the ISR wakes up the first \
waiting process. The first process is woken, runs and exits kernel context back to \
user.

Which process now runs?

Is the waiting task scheduled as soon as the high priority returns to user mode or \
does the high priority process run until the low priority process is scheduled or the \
high sleeps and the low scheduled.

Thanks for any help
Regards
Pete

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