Date: Tue, 5 Jan 1999 13:43:35 -0700 From: Nate Williams <nate@mt.sri.com> To: Narvi <narvi@haldjas.folklore.ee> Cc: Nate Williams <nate@mt.sri.com>, Terry Lambert <tlambert@primenet.com>, Wes =?iso-8859-1?Q?Peters=D4?=?=?iso-8859-1?Q?=40=21=EA?=? <wes@softweyr.com>, bright@hotjobs.com, hackers@FreeBSD.ORG Subject: Re: question about re-entrancy. Message-ID: <199901052043.NAA09607@mt.sri.com> In-Reply-To: <Pine.BSF.3.96.990105223702.5112Y-100000@haldjas.folklore.ee> References: <199901052008.NAA09332@mt.sri.com> <Pine.BSF.3.96.990105223702.5112Y-100000@haldjas.folklore.ee>
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> > > [snip] > > > > > > > > The problem with object locks is that it puts > > > > > objects that don't really need to be in a contention > > > > > domain into one in order to satisfy contention in what > > > > > are usually very small critical sections having to do > > > > > with list manipulation of pointers to the object. > > > > > > > > So you're claiming that the 'Big Giant Lock' is the better way? You > > > > can't have it both ways. > > > > > > > > > > > > > > > > Nate > > > > > > The third way (about which Terry did talk) is to have locks around > > > critical sections. > > > > That *is* what an 'object lock' in RTEMS is. > > > > An "object lock" is a lock associated with some object. In order to access > the object, you acquire the lock. > > A "critical section" lock is a lock associated with a certain critical > section of code. In order to enter that specific section of code, you > acquire the lock. A 'critical section of code' is a portion of the code that is accessing a shared resource, which can be protected by using an object lock. Or, better put you 'aquire a lock' before you enter the 'critical section' and 'release the lock' after you leave the critical section. (semaphores). Like I said, it's the same thing, just different terminology. Nate To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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