Date: Sat, 17 Dec 2005 16:27:28 +0800 From: prime <guomingyan@gmail.com> To: freebsd-hackers@freebsd.org Subject: Puzzled about turnstile's lock Message-ID: <1fa17f810512170027h58ccadbcq9f8d3187f35a2ddd@mail.gmail.com>
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Hi hackers,
I want to understand the current implementation of
turnstile,and meet some questions about its locks' logicality.
turnstile's ``ts_blocked" field is protected by both
``td_contested" lock and its turnstile_chain lock, but
I think its turnstile_chain lock is enough,because we
allways get the turnstile_chain lock before our manipulation
on ``ts_blocked".
If td_contested lock were needed ,reading ts_blocked is
not protected by td_contested lock,in the kernel source, why?
Thanks.
--
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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