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From: Sergey Reva <rs_rlab@mail.ru>
To: Fans of the OS Plan 9 from Bell Labs <9fans@cse.psu.edu>
Subject: Re: [9fans] How it work?
Date: Wed, 23 Mar 2005 08:57:56 +0200	[thread overview]
Message-ID: <538092562.20050323085756@mail.ru> (raw)
In-Reply-To: <Pine.BSI.4.61.0503221431500.25349@malasada.lava.net>

Hello fans

Thanks Tim for advice!

Now I find:
1. "lock" used tas (test-and-set), in libc too
2. "queuing lock" use "lock", and also suspend task which wait locking
3. "rendezvous" can handle two task (and live in kernel)
4. "Rendez" (as subset of rsleep;rwakeup;rwakeupall) can handle multiple
   tasks (and live in libc)

Is it right?

TN> There are several types of locks.  Some (like spin locks) can operate
TN> without any assistance from the kernel (not entirely, they yield with a
TN> syscall).  Others (like rendezvous) use the kernel to mediate between the
TN> processes.
As I seen both rendezvous and Rendez(rsleep;rwakeup;rwakeupall)
change state of process but Rendez can do this even in libc, where is
different other than state of process: Rendezvous (in syscall) and
Sleep (in rendez)? why rendezvous need to be at kernel?

--
http://rs-rlab.narod.ru                            mailto:rs_rlab@mail.ru



  reply	other threads:[~2005-03-23  6:57 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-03-22 19:00 Sergey Reva
2005-03-23  0:40 ` Tim Newsham
2005-03-23  6:57   ` Sergey Reva [this message]
2005-03-23 17:34     ` Russ Cox
2005-03-24  8:46       ` Sergey Reva
2005-03-24  8:55         ` noselasd
     [not found]         ` <4439b95e268ad4987f174271ac554f28@smtp.songnetworks.no>
2005-03-25 10:33           ` Sergey Reva
2005-03-25 17:08             ` Russ Cox

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