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From: Torvald Riegel <triegel@redhat.com>
To: paulmck@linux.vnet.ibm.com
Cc: Susmit.Sarkar@cl.cam.ac.uk, Andrew Haley <aph@redhat.com>,
	qemu-devel@nongnu.org, Liu Ping Fan <qemulist@gmail.com>,
	Anthony Liguori <anthony@codemonkey.ws>,
	luc.maranget@inria.fr, Paolo Bonzini <pbonzini@redhat.com>,
	Peter.Sewell@cl.cam.ac.uk, Richard Henderson <rth@twiddle.net>
Subject: Re: [Qemu-devel] Java volatile vs. C11 seq_cst (was Re: [PATCH v2 1/2] add a header file for atomic operations)
Date: Tue, 18 Jun 2013 17:37:42 +0200	[thread overview]
Message-ID: <1371569862.16968.23402.camel@triegel.csb> (raw)
In-Reply-To: <20130618145033.GN5146@linux.vnet.ibm.com>

On Tue, 2013-06-18 at 07:50 -0700, Paul E. McKenney wrote:
> First, I am not a fan of SC, mostly because there don't seem to be many
> (any?) production-quality algorithms that need SC.  But if you really
> want to take a parallel-programming trip back to the 1980s, let's go!  ;-)

Dekker-style mutual exclusion is useful for things like read-mostly
multiple-reader single-writer locks, or similar "asymmetric" cases of
synchronization.  SC fences are needed for this.

> PS:  Nevertheless, I personally prefer the C++ formulation, but that is
>      only because I stand with one foot in theory and the other in
>      practice.  If I were a pure practitioner, I would probably strongly
>      prefer the Java formulation.

That's because you're a practitioner with experience :)

  parent reply	other threads:[~2013-06-18 15:38 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-06-16 11:21 [Qemu-devel] [PATCH v2 0/2] make AioContext's bh re-entrant Liu Ping Fan
2013-06-16 11:21 ` [Qemu-devel] [PATCH v2 1/2] add a header file for atomic operations Liu Ping Fan
2013-06-17 18:57   ` Richard Henderson
2013-06-18  8:36     ` Paolo Bonzini
2013-06-18 11:03       ` Paolo Bonzini
2013-06-18 14:38       ` Richard Henderson
2013-06-18 15:04         ` Paolo Bonzini
2013-06-18 13:24     ` [Qemu-devel] Java volatile vs. C11 seq_cst (was Re: [PATCH v2 1/2] add a header file for atomic operations) Paolo Bonzini
2013-06-18 14:50       ` Paul E. McKenney
2013-06-18 15:29         ` Peter Sewell
2013-06-18 15:37         ` Torvald Riegel [this message]
2013-06-19  1:53           ` Paul E. McKenney
2013-06-19  7:11             ` Torvald Riegel
2013-06-20 15:18               ` Paul E. McKenney
2013-06-18 16:08         ` Paolo Bonzini
2013-06-18 16:38           ` Torvald Riegel
2013-06-19  1:57             ` Paul E. McKenney
2013-06-19  9:31             ` Paolo Bonzini
2013-06-19 13:15               ` Torvald Riegel
2013-06-19 15:14                 ` Paolo Bonzini
2013-06-19 20:25                   ` Torvald Riegel
2013-06-20  7:53                     ` Paolo Bonzini
2013-06-22 10:55                       ` Torvald Riegel
2013-06-18 15:26       ` Torvald Riegel
2013-06-18 17:38       ` Andrew Haley
2013-06-19  9:30         ` Paolo Bonzini
2013-06-19 15:36           ` Andrew Haley
2013-06-16 11:21 ` [Qemu-devel] [PATCH v2 2/2] QEMUBH: make AioContext's bh re-entrant Liu Ping Fan
2013-06-17 15:28   ` Stefan Hajnoczi
2013-06-17 16:41     ` Paolo Bonzini
2013-06-18  2:19     ` liu ping fan
2013-06-18  9:31       ` Stefan Hajnoczi
2013-06-18 15:14   ` mdroth
2013-06-18 16:19     ` mdroth
2013-06-18 19:20     ` Paolo Bonzini
2013-06-18 22:26       ` mdroth
2013-06-19  9:27         ` Paolo Bonzini
2013-06-20  9:11           ` Stefan Hajnoczi
2013-06-17  7:11 ` [Qemu-devel] [PATCH v2 0/2] " Paolo Bonzini
2013-06-18  2:40   ` liu ping fan
2013-06-18  8:36     ` Paolo Bonzini

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