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Re: TAG feedback on Web Audio

From: Adam Goode <agoode@google.com>
Date: Thu, 1 Aug 2013 11:49:55 -0400
Message-ID: <CAOf41N=SwWFNxHQ4qdjYvjZ+Q-u8+P9p3_V2SdB+5t48_X7hNQ@mail.gmail.com>
To: Jer Noble <jer.noble@apple.com>
Cc: Chris Wilson <cwilso@google.com>, Ehsan Akhgari <ehsan.akhgari@gmail.com>, Noah Mendelsohn <nrm@arcanedomain.com>, Anne van Kesteren <annevk@annevk.nl>, Olivier Thereaux <Olivier.Thereaux@bbc.co.uk>, "robert@ocallahan.org" <robert@ocallahan.org>, Alex Russell <slightlyoff@google.com>, "public-audio@w3.org" <public-audio@w3.org>, List <www-tag@w3.org>
Yes, from the intel blog:
"a *data race* occurs when two threads access the same variable
concurrently and at least one of the accesses is a write"

You only need one writer for a data race to occur.


Adam



On Thu, Aug 1, 2013 at 11:41 AM, Jer Noble <jer.noble@apple.com> wrote:

>
> On Aug 1, 2013, at 7:13 AM, Adam Goode <agoode@google.com> wrote:
>
> That document is a bit misleading/outdated when it comes to data races
> being "harmless". This more recent article illustrates these issues:
>
> http://software.intel.com/en-us/blogs/2013/01/06/benign-data-races-what-could-possibly-go-wrong
>
>
> Perhaps you can clarify something for me.  In both the above page and the
> one Ehsan linked to earlier (<http://blog.regehr.org/archives/490>), a
> "data race" occurrs when two threads are writing to the same memory.  In
> the WebAudio API "data races" we are discussing, the main thread is
> potentially writing to memory which the audio thread is reading.  I.e., the
> audio thread never writes to these buffers.
>
> Should this still be considered a "data race"?
>
> -Jer
>
>
Received on Thursday, 1 August 2013 15:50:28 UTC

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