Re: [racket-dev] request: replace-evt
Added! At Tue, 8 Jul 2014 05:36:55 +0100, Matthew Flatt wrote: Hi Jan, That's a nice idea. Something similar --- but in a restricted form --- is used internally to implement various primitive events. I think I see how to generalize it to work with more arbitrary events and non-atomic replace functions. There could easily be a catch that I'm overlooking, but I'll give it a try. Matthew At Mon, 07 Jul 2014 22:41:55 +0200, Jan Dvořák wrote: Hi, I would like to humbly request a new `replace-evt` procedure that would work as `wrap-evt` except that when it produces another `evt?`, `sync` replaces the old event with the newly produced one and restarts. It will be a good replacement for threads and channels when filtering events or addition of bookkeeping handlers is desired. I peeked at the syncing code and it seems doable, but the code is too dense for me to grok it. :-( What do you think? Best regards, Jan Dvorak _ Racket Developers list: http://lists.racket-lang.org/dev _ Racket Developers list: http://lists.racket-lang.org/dev _ Racket Developers list: http://lists.racket-lang.org/dev
[racket-dev] request: replace-evt
Hi, I would like to humbly request a new `replace-evt` procedure that would work as `wrap-evt` except that when it produces another `evt?`, `sync` replaces the old event with the newly produced one and restarts. It will be a good replacement for threads and channels when filtering events or addition of bookkeeping handlers is desired. I peeked at the syncing code and it seems doable, but the code is too dense for me to grok it. :-( What do you think? Best regards, Jan Dvorak _ Racket Developers list: http://lists.racket-lang.org/dev
Re: [racket-dev] request: replace-evt
Hi Jan, That's a nice idea. Something similar --- but in a restricted form --- is used internally to implement various primitive events. I think I see how to generalize it to work with more arbitrary events and non-atomic replace functions. There could easily be a catch that I'm overlooking, but I'll give it a try. Matthew At Mon, 07 Jul 2014 22:41:55 +0200, Jan Dvořák wrote: Hi, I would like to humbly request a new `replace-evt` procedure that would work as `wrap-evt` except that when it produces another `evt?`, `sync` replaces the old event with the newly produced one and restarts. It will be a good replacement for threads and channels when filtering events or addition of bookkeeping handlers is desired. I peeked at the syncing code and it seems doable, but the code is too dense for me to grok it. :-( What do you think? Best regards, Jan Dvorak _ Racket Developers list: http://lists.racket-lang.org/dev _ Racket Developers list: http://lists.racket-lang.org/dev
