Bug 227160 – Functions dispatched to WorkQueue are sometimes destroyed in the calling thread due to block refcounting

• Component: Platform
• Status: RESOLVED FIXED

[Kimmo Kinnunen]

Functions dispatched to WorkQueue are sometimes destroyed in the calling thread due to block refcounting

A lot of dispatched lambdas are written with the expectation that the destruction of the lambda is done in the called  thread.

See discussion for r270876 as a example where time was spent debugging this. 

See git grep "dispatch(.*WTFMove.*{.*}" for subset of call sites that expect the WorkQueue to behave in different way.

[Kimmo Kinnunen]

Created attachment 431761 [details]
Patch

[Antti Koivisto]

Comment on attachment 431761 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=431761&action=review

> Source/WTF/wtf/cocoa/WorkQueueCocoa.cpp:35
> +namespace {
> +struct DispatchWorkItem {

Could use an empty line here.

> Source/WTF/wtf/cocoa/WorkQueueCocoa.cpp:51
> +
> +

Extra empty line here.

[Kimmo Kinnunen]

Created attachment 431766 [details]
Patch for landing

[Kimmo Kinnunen]

Created attachment 431836 [details]
Patch for landing

[EWS]

Committed r279115 (239032@main): <https://commits.webkit.org/239032@main>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 431836 [details].

[Radar WebKit Bug Importer]

<rdar://problem/79611008>