Oh, right: so you probably don't want 'get' 'put' and 'is-full?' but you want 'get' and 'try-put' that fails only when the channel is full, returning a boolean to indicate success.
Robby On Mon, Dec 2, 2013 at 11:24 PM, David T. Pierson <d...@mindstory.com> wrote: > On Fri, Nov 29, 2013 at 12:23:42PM -0800, Eric Dobson wrote: > > I'm trying to make a custom output port that is backed by a > > async-channel. One of the operations that ports need to provide is an > > event that is ready when progress on the event can be made. But since > > I cannot tell if the async-channel is full and put would not block > > without actually sending a value, I cannot provide such an event. Is > > it possible to provide such an API or does the implementation of > > async-channels prevent this? > > I don't know much about creating custom ports, so I looked up progress > events in order to understand your question better. But now I'm > confused, because progress events seem to be specific to input ports, > whereas it sounds like you are creating an output port. What am I > missing? > > Regarding your actual question: I think the reason a non-side-effecting > async-channel-put-evt is not provided is that using such an event could > lead to race conditions. A previous thread [1] on this list touched on > this with regard to places and channels as events; I'm extrapolating to > extend that answer to async-channel-put-evt. > > David > > [1] http://www.mail-archive.com/users@racket-lang.org/msg15630.html > ____________________ > Racket Users list: > http://lists.racket-lang.org/users >
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