DragonFly kernel List (threaded) for 2003-10
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Re: Fast User Space Mutexes (aka Futexes)
Bill Huey (hui) wrote:
: On Sun, Oct 26, 2003 at 09:29:42AM +0000, Hiten Pandya wrote:
:
:>Bill Huey (hui) wrote:
:>
:>>http://people.redhat.com/drepper/futex.pdf
:>>
:>>Better documentation on how it's used and some implementation issues with
:>>glibc. The problem with futex's in the context of dfBSD is that it's
:>>used for their 1:1 threading model, which is different than the M:N
:>>stuff that's being done recently. I think it's essential to think about
:>
:> I recall Rusty Russell added the Asynchronous interface to the
:> Futex interface, yes, I am referring to the FUTEX_AWAIT and
:> friends. It was needed for the NGPT work, since it is M:N
:> effectively.
:
: I didn't see that interface mentioned in the above docs. Should I look
: at the most recent kernel sources ?
It always helps to have a Linux 2.5/2.6 kernel around for
getting enlightened. Yes, I am not exactly sure when the
change was made, but I recall Rusty posted a patch on the
Linux kernel mailing list, later intergrated into the
2.5 kernel.
The AWAIT (async) interface gave birth to the whole /dev/futex
thing, and friends, such as futex_poll(), futex_open(). Some
code with an example userland library implimentation was
attached in Rusty's mail.
Checkout for more goodies:
www.kernel.org/pub/linux/kernel/people/rusty/
Regards,
--
Hiten Pandya
hmp@xxxxxxxxxxxxx
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