Date: Thu, 15 Aug 2002 11:51:58 +0800 From: "ouyang kai" <oykai@msn.com> To: <freebsd-hackers@FreeBSD.ORG> Subject: Hi, the kernel how control timeout and interrupt method? Message-ID: <OE42jF7HWWcWBT2Ko0900014134@hotmail.com>
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[-- Attachment #1 --] [-- Attachment #2 --] Hi guys, I have two questions, please help. 1. in one book, there are both pfslowtimo(void *arg) and pffasttimo(void *arg) in uipc_domain.c, which will be called by timeout, one is called every 500ms, the other is called every 200ms. I want to know how FreeBSD control the timeout? I want to the kernel how to know it is time to call pfslowtimo or pffasttimo? 2. I have a data-line, which connet the COM2 with a special backplane(my box's IDE disk attach by the backplane). I can scan the COM2's state to find whether the IDE disk exist or not. I use the polling method to scan in user space. I access '/dev/io' device and get the COM state from the interface address.I think this method is unefficient. I think when the COM status change, it should spring an interrupt, the kerenl will ignore the interrupt default, right? I can write an interrupt program, or embed my process in the kernel. But I have no idea how to start. how can I start my task? Thank you! Best Regards Ouyang Kai
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