Date: Mon, 08 Jul 2002 15:27:22 -0400 (EDT) From: John Baldwin <jhb@FreeBSD.org> To: David Xu <davidx@viasoft.com.cn> Cc: freebsd-current@FreeBSD.ORG, Julian Elischer <julian@elischer.org> Subject: RE: Timeout and SMP race Message-ID: <XFMail.20020708152722.jhb@FreeBSD.org> In-Reply-To: <001101c222fa$9b32eed0$ef01a8c0@davidwnt>
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On 04-Jul-2002 David Xu wrote: > while we are getting rid of Giant, current race condition between softclock() > and callout_stop() is unacceptable. the race causes two many places in source > code would be modified to fit this new behaviour, besides this, everywhere > callout_stop() is used need to hold sched_lock and do a mi_switch() and > modify td_flags is also unacceptable, this SMP race should be resolved in > kern_timeout.c. How would you resolve it while still preserving the existing semantics? Saying "this race should be resolved" doesn't explain how you would go about resolving it. It's a lot harder than it looks. -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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