[Webkit-unassigned] [Bug 108892] Passing alpha to DeferredImageDecoder once decoding completes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=108892





--- Comment #16 from Min Qin <qinmin at chromium.org>  2013-02-13 18:18:48 PST ---
(From update of attachment 188163)
View in context: https://bugs.webkit.org/attachment.cgi?id=188163&action=review

>> Source/WebCore/platform/graphics/chromium/ImageFrameGenerator.cpp:227
>> +    return m_hasAlpha;
> 
> I know I'll regret asking this, since threading has a long history of making me look like an idiot, but why do you need to lock the mutex for a read?  It's a bool, so all reads should be atomic anyway, no?

reading a bool should be atomic, but I am not sure whether this is the case with multi-core processor cache.
If read/write are on different processors, this probably might not hold.

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