[Webkit-unassigned] [Bug 115875] add atomicAdd and atomicSubtract

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=115875


Benjamin Poulain <benjamin at webkit.org> changed:

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 Attachment #201278|review?, commit-queue?      |review-, commit-queue-
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--- Comment #2 from Benjamin Poulain <benjamin at webkit.org>  2013-05-09 14:44:52 PST ---
(From update of attachment 201278)
(In reply to comment #0)
> Source/WTF/wtf/Atomics.h currently has atomicIncrement and atomicDecrement for adding and subtracting 1 atomically, but there is no way to add and subtract other values atomically using WTF.  This is needed in cases like Source/WTF/wtf/text/StringImpl.h line 584, which increments a value by 2.
> 
> I added atomicAdd and atomicSubtract and tested it on Mac, but I'd prefer someone try this on Windows before reviewing in case I forgot something Windows-specific.

StringImpl does not use atomic ref-deref.

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