Re: mutexes, locks and so on...

[der Mouse <mouse%Rodents-Montreal.ORG@localhost>]

Just a note to avoid having incorrect information in the archives
without a correction.  I wrote:

> [%] It occurs to me, the VAX's BBSSI and BBCCI _are_ CAS, just
> restricted to a one-bit-wide operand (and with the data-to-swap-in
> specified by choice of instruction rather than an operand).

This is false.  CAS, as the term is normally used, turns out to be not
the compare-and-swap the acronym expands to but
compare-and-conditionally-swap.  However, BBSSI and BBCCI always
perform the write.

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