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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