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[Bug 13799] Should Transferables be transfered even when postMessage fails?

From: <bugzilla@jessica.w3.org>
Date: Wed, 19 Oct 2011 00:49:33 +0000
To: public-webapps@w3.org
Message-Id: <E1RGKLd-0003eI-Rx@jessica.w3.org>

Ian 'Hixie' Hickson <ian@hixie.ch> changed:

           What    |Removed                     |Added
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED

--- Comment #3 from Ian 'Hixie' Hickson <ian@hixie.ch> 2011-10-19 00:49:33 UTC ---
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Status: Accepted
Change Description: see diff given below
Rationale: Concurred with reporter's comments.

kbr: I don't understand why you need to do anything to ArrayBufferViews when
transferring ArrayBuffers. Just have the ArrayBufferView's byteOffset,
byteLength, etc, properties return 0 when the underlying ArrayBuffer has been
neutered. (Also, don't forget to actually say that the old ArrayBuffer is
neutered — see the HTML spec for MessagePort to see what I mean.) Similarly,
in the "Interactions with the Structured Cloning Algorithm" you don't need to
have any special case for ArrayBuffer, that's already handled (because it's
Transferable), and the code for ArrayBufferView just needs to say that it
recurses to the ArrayBuffer (which won't do anything straight away since the
new objects are placeholders at this point now) and then creates a new object
with the same values, or something like that. Since the actual transfer happens
after the cloning, the values don't get zeroed out until after the clone
happens — and if you define the ArrayBufferView interface's attributes as
returning zero if the buffer is neutered, independent of the cloning algorithm,
then you don't have to worry about that happening during cloning either. Ping
me if this isn't clear.

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Received on Wednesday, 19 October 2011 00:49:37 UTC

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