Tom 54eeb8ee9a AK: Fix a race condition with WeakPtr<T>::strong_ref and destruction ...

Since RefPtr<T> decrements the ref counter to 0 and after that starts
destructing the object, there is a window where the ref count is 0
and the weak references have not been revoked.

Also change WeakLink to be able to obtain a strong reference
concurrently and block revoking instead, which should happen a lot
less often.

Fixes a problem observed in #4621

2020-12-31 00:39:43 +01:00

7.0 KiB

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