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Re: FW: Questions about dsr?
- From: Bart Veer <bartv at ecoscentric dot com>
- To: Wang dot Alvin at iac dot com dot tw
- Cc: ecos-discuss at sources dot redhat dot com
- Date: Thu, 17 Apr 2003 13:30:04 +0100 (BST)
- Subject: Re: [ECOS] FW: Questions about dsr?
- References: <F6DEA3313387954C8EAEA023853768DCF1CD9E@tao-mx2.iec.inventec>
>>>>> "Alvin" == <Wang dot Alvin at iac dot com dot tw> writes:
>> Hi to all,
>>
>> I have some questions about DSR as following
>>
>> 1.Can DSR waits on semphore?
No.
>> 2.If one DSR is blocked, can kernel switch to another DSR?
No. A DSR must run to completion before the next DSR is run, or before
control returns to a thread, although interrupts are allowed while a
DSR is running.
For more information see the kernel documentation,
http://sources.redhat.com/ecos/docs-latest/ref/kernel-overview.html
especially the sections on "Threads and Interrupt Handling" and
"Calling Contexts".
Bart
--
Bart Veer eCos Configuration Architect
http://www.ecoscentric.com/ The eCos and RedBoot experts
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