[Webkit-unassigned] [Bug 238871] Multiple uses of ThreadSafeRefCounted and CanMakeWeakPtr with non-thread-safe WeakPtr

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=238871

--- Comment #2 from Chris Dumez <cdumez at apple.com> ---
Not that in general, it is perfectly OK for a class to subclass ThreadSafeRefCounted and CanMakeWeakPtr and it is not indicative of a bug. It really depends on how you're using WeakPtr.

E.g., the following case is pretty common in WebKit:
1. We have an object A that gets constructed and destroyed on the main thread.
2. We sometimes pass object A to a background thread T and then back to the main thread.

It is OK as long as you only check the WeakPtr on the main thread and make sure that the object is always destroyed on the main thread.

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