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Masaki Hara (qnighy@qnmd.info)'s status on Sunday, 02-Sep-2018 19:42:59 JST Masaki Hara
- せのお (妹尾賢)
https://internals.rust-lang.org/t/proposal-drop-with-panic-argument/8331
Mutexなどポイズニングをする型は「パニック中かどうか」をdropのなかで判定する必要があるが、そのためにいちいちスレッドローカルストレージにアクセスするのは好ましくない。そこで、dropの引数としてpanic中かどうかを渡すようにしたらよいのではと提案している人がいる
In conversation Sunday, 02-Sep-2018 19:42:59 JST from qnmd.info permalink Repeated by 8vit
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1. Domain not in remote thumbnail source whitelist: internals.rust-lang.org
  
  Proposal: drop with panic argument
  
  from Rust Internals
  
  Currently, in order to detect in a Drop impl whether the program is currently panicking, the drop function must access thread-local storage, which is expensive. This slows down certain key primitives such as MutexGuard. I propose that we add a new method to Drop that takes a bool argument indicating whether the function is being called due to unwinding. It would look something like this: trait Drop { fn drop(&mut self); fn drop_unwinding(&mut self, unwinding: bool) { Drop::dro...

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