On Sun, 25 Nov 2007, Julian Elischer wrote:
Do we need both?
Well, we need something but it could be that the naming was unfortunate.
I think there's a strong argument to be made that we should try and align the
rmlock and rwlock primitives in API and data structures, if it doesn't royally
break things, because that way the probability of read/write can be expressed
as a hint when initializing the lock (i.e., RW_WRITEUNLIKELY) and then tuned
opaquely. In the case of rwlock and rmlock, we consider both to be bounded
sleep primitives, so semantically similar (and getting more so, I think).
Likewise, I'm not opposed to the idea of deprecating sleep mutexes and
replacing them entirely with rwlocks used only in an exclusive way, although
I'm not actively advocating the change.
Robert N M Watson
Computer Laboratory
University of Cambridge
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