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> Read up, you've missed a memo :-P. Plan for Harmony-era weak refs is to notify in next event loop turn. Got a link to the memo? I haven't heard about this on

> Read up, you've missed a memo :-P. Plan for Harmony-era weak refs is to notify in next event loop turn. Got a link to the memo? I haven't heard about this one. > Why do you need to manually deallocate a callback function passed to setTimeout? One of my use cases is running lua in the browser. see lua.vm.js: https://kripken.github.io/lua.vm.js/repl.html https://kripken.github.io/lua.vm.js/repl.html When you pass a lua function to a javascript function, I create a 'proxy' object that holds a reference to the function in the lua VM. Only if javascript tells me it's "done" with it can I drop the ref inside the lua VM.

chadaustin 11y ago
FWIW, this is exactly the same problem we had with making it possible for Embind to allow passing C++ functions into setTimeout. We'd need to synthesize a JavaScript function that holds a wrapper object for the C++ function, and that wrapper object would need to be deallocated when the timer is done. For general callbacks, this is a hard problem, and finalizers would provide a clean way to solve it.
BrendanEich 11y ago
See, e.g., https://esdiscuss.org/topic/weak-event-listener#content-2 https://esdiscuss.org/topic/weak-event-listener#content-2 It's hard to find something fresh. I will stir the pot at the July TC39 meeting and get the committee on the record for weak refs with turn-delayed notification, or bust!
- daurnimator 11y ago
  > See, e.g., > https://esdiscuss.org/topic/weak-event-listener#content-2 https://esdiscuss.org/topic/weak-event-listener#content-2 > It's hard to find something fresh. I will stir the pot at the July TC39 meeting and get the committee on the record for weak refs with turn-delayed notification, or bust! As recently as September last year you told me it may happen... but with an indeterminate timeframe: https://mail.mozilla.org/pipermail/es-discuss/2014-September/039078.html https://mail.mozilla.org/pipermail/es-discuss/2014-September...
  - BrendanEich 11y ago
    Yeah, it needs an active champion. I'll poke likely champs.

chadaustin 11y ago

FWIW, this is exactly the same problem we had with making it possible for Embind to allow passing C++ functions into setTimeout. We'd need to synthesize a JavaScript function that holds a wrapper object for the C++ function, and that wrapper object would need to be deallocated when the timer is done. For general callbacks, this is a hard problem, and finalizers would provide a clean way to solve it.

BrendanEich 11y ago

See, e.g., https://esdiscuss.org/topic/weak-event-listener#content-2 https://esdiscuss.org/topic/weak-event-listener#content-2 It's hard to find something fresh. I will stir the pot at the July TC39 meeting and get the committee on the record for weak refs with turn-delayed notification, or bust!

daurnimator 11y ago
> See, e.g., > https://esdiscuss.org/topic/weak-event-listener#content-2 https://esdiscuss.org/topic/weak-event-listener#content-2 > It's hard to find something fresh. I will stir the pot at the July TC39 meeting and get the committee on the record for weak refs with turn-delayed notification, or bust! As recently as September last year you told me it may happen... but with an indeterminate timeframe: https://mail.mozilla.org/pipermail/es-discuss/2014-September/039078.html https://mail.mozilla.org/pipermail/es-discuss/2014-September...
- BrendanEich 11y ago
  Yeah, it needs an active champion. I'll poke likely champs.