Date: Thu, 23 Mar 2000 23:27:46 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: Chad David <davidc@acns.ab.ca> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: vm_await() Message-ID: <200003240727.XAA08899@apollo.backplane.com> References: <Pine.BSF.4.21.0003232357001.12954-100000@lodge.guild.ab.ca>
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:In vm_await(), asleep() is called with "vmwait", and then
:vm_await() just returns. What then happens to the memory at
:"vmwait" that was passed to asleep()?
:
:Am I missing something, other than vm_await is never called
:so it doesn't really matter?
:
:Also, with a quick find, it looks like atapi_queue_cmd() does the
:same thing in atapi-all.c, but I might be missing something here.
:
:Chad
The memory at the 'wait' address you tsleep and wakeup on is
never actually accessed, the address is simply used as a
placemarker in the hash table. So it's ok to asleep() on an
address and then never use it, and it's ok if the object
represented by the address is ripped out from under you in
that case.
-Matt
Matthew Dillon
<dillon@backplane.com>
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