Date: Wed, 13 Sep 2000 01:44:45 -0600 From: Warner Losh <imp@village.org> To: Joerg Micheel <joerg@cs.waikato.ac.nz> Cc: Greg Lehey <grog@lemis.com>, Matthew Jacob <mjacob@feral.com>, Frank Mayhar <frank@exit.com>, John Baldwin <jhb@pike.osd.bsdi.com>, Mark Murray <markm@FreeBSD.ORG>, FreeBSD-arch@FreeBSD.ORG Subject: Re: cvs commit: src/sys/conf files src/sys/sys random.h src/sys/dev/randomdev hash.c hash.h harvest.c randomdev.c yarrow.c yarro Message-ID: <200009130744.BAA86075@harmony.village.org> In-Reply-To: Your message of "Tue, 12 Sep 2000 14:52:55 %2B1200." <20000912145255.A41113@cs.waikato.ac.nz> References: <20000912145255.A41113@cs.waikato.ac.nz> <200009120101.e8C11nN56928@realtime.exit.com> <Pine.LNX.4.21.0009111801490.25916-100000@zeppo.feral.com> <20000912121105.J88615@wantadilla.lemis.com>
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In message <20000912145255.A41113@cs.waikato.ac.nz> Joerg Micheel writes: : I liked the model Sun chose for Solaris. They have mutex', rw_locks, : condition variables. I don't like semaphores. Mutexes are for short : locks. Condition variables are for long-term waits, they are associated : with a mutex. You can only sleep/wakeup a CV when holding the associated : with it, which prevents races. When having to sleep on a CV the kernel : would unlock the mutex and reaquire it for the running thread before : returning. I've found that these are about as easy to use as spl/splx. Warner To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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