On May 20, 2005, at 3:49 PM, Peter Jeremy wrote:
On Fri, 2005-May-20 21:51:34 +0200, Hans Petter Selasky wrote:
Can anyone explain why "uiomove()" has to sleep, and why there is no
non-blocking "uiomove()"?
As far as I can see, uiomove() only sleeps if it is asked to do a
kernel<->userland move that takes more than twice a scheduler quantum.
As long as you don't uiomove() ridiculous amounts of data, it should
never sleep.
It can also sleep if it is reading from or writing to user memory if
any of that memory needs to be faulted in.
--
John Baldwin <[EMAIL PROTECTED]> <>< http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve" = http://www.FreeBSD.org
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