"Peter Dimov" <pdimov@mmltd.net> wrote in message news:002b01c6f7c2$17116590$6607a8c0@pdimov2...
Chris Thomasson wrote:
"Peter Dimov" <pdimov@mmltd.net> wrote in message news:001801c6f7bd$c32f62a0$6607a8c0@pdimov2...
Chris Thomasson wrote:
How does the original algorithm compare to yours?
I haven't tried it yet. Will do.
Humm...
Hmmm. Doesn't seem to work. What does your dwcas return on success in &cmp? Leaves it unchanged, perhaps? I always return the current value of &mtx there and it seems that your code depends on &cmp only changing if the dwcas fails.
I am using an IBM-Style CAS: http://groups.google.com/group/comp.programming.threads/msg/bf68fe51225f1cbb http://groups.google.com/group/comp.programming.threads/msg/b64b2419a6b05bb6 it updates the comprand and returns non-zero on failure. Here is exactly how its implemented; look at the very first function in this file: http://appcore.home.comcast.net/appcore/src/cpu/i686/ac_i686_mingw_asm.html or MASM http://appcore.home.comcast.net/appcore/src/cpu/i686/ac_i686_masm_asm.html Does that clear some things up?