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List:       uclinux-dev
Subject:    RE: [uClinux-dev] thread switching response time
From:       "Friedrich, Lars" <lars.friedrich () wago ! com>
Date:       2005-11-17 11:29:21
Message-ID: AB4979EC12A5EB419810807434495A17283DCD () svex01001 ! wago ! local
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> problem:
> poll_wait() returns 9 to 15 milliseconds too late
> 
> question:
> What happens during that "long" time?

This is not really important.

Correct question:
What is required to be woken up?
A timer interrupt.

How often does a timer interrupt arrive?
Every 10 milliseconds (+latency).

> What can I do to have a response in time (say faster than 1ms)?

- Generate a IRQ
- Use a different operating system

Best regards,
Lars Friedrich
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