Date: Fri, 13 Jan 2006 14:32:34 +0800 From: prime <guomingyan@gmail.com> To: freebsd-hackers@freebsd.org Subject: How priority propagation works on read/write lock? Message-ID: <1fa17f810601122232l25551bc5n4e4a01ff6b7921e@mail.gmail.com>
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Hi hackers,
I have a question about how priority propagation works on
read/write lock.On locks that have only one owner at a determinate
moment,we can simply propagate the priority to the owner of lock,but
read/write lock may have many owners at some time,so how can we know
who are the owners?
I browse the OpenSolaris' read/write lock implementation,and find
that, it simply treats the owner of the lock as NULL when readers own
the read/write lock.In this way,we can not propagate our priority to
all threads that block us.
Thanks very much.
--
Three passions, simple but overwhelmingly strong, have governed my life:
the longing for love, the search for knowledge, and unbearable pity for
the suffering of mankind.
---------Bertrand Russell
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