On 03-Oct-00 Zhiui Zhang wrote:
>
> On Tue, 3 Oct 2000, John Baldwin wrote:
>>
>> On 02-Oct-00 Zhiui Zhang wrote:
>> >
>> > Suppose a process is scheduled to run, will it run until its quantum ends
>> > unless it calls tsleep() on his own? In other words, is it possible for a
>> > process to give up its quantum earlier without having it to do so
>> > voluntarily? Thanks.
>>
>> If an interrupt occurs and puts a thread on the run queue (which will have
>> higher priority than the currently running proceess) then the current
>> process will be stopped so that the interrupt thread can run.
>
> Thanks. But I guess that you are talking about the new SMP threads. For
> FreeBSD 4.1-Release, I am not sure this can happen. I am wondering any
> time taken by interrupts (hardware or software) will be accounted to the
> current process. If so, the process's quantum is stolen away and nothing
> useful for that process is done.
Yes, in pre-SMPng, interrupts use up part of the current process's quantum.
--
John Baldwin <[EMAIL PROTECTED]> -- http://www.FreeBSD.org/~jhb/
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