Date: Sat, 11 Nov 2000 22:12:35 -0500 (EST) From: Zhiui Zhang <zzhang@cs.binghamton.edu> To: freebsd-hackers@freebsd.org, freebsd-smp@freebsd.org Subject: simple lock and the lost wakeup problem Message-ID: <Pine.SOL.4.21.0011112158540.13428-100000@opal>
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I am new to SMP subject and have some questions to ask: Is the simplelock() really needed since FreeBSD is using the big giant lock and the kernel is non preemptive? Or has FreeBSD changed the big giant lock and made kernel thread preemptive? Uresha Vahalia talks about Lost Wakeup Problem (page 196), the test of the resource and sleep() has to be done atomically. Which correct mechanism should I use on FreeBSD to achieve this (avoid the lost-wakeup problem)? Any help is appreciated. -Zhihui To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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