Depending on what you're doing, a nack guard evt might be helpful. It lets do a form of chaining evts together. It definitely isn't and in the sense you describe but it is easy to overlook.
Robby On Mon, Mar 15, 2021 at 4:50 PM Matthew Flatt <[email protected]> wrote: > At Mon, 15 Mar 2021 13:38:46 -0700 (PDT), Greg Rosenblatt wrote: > > Is there a corresponding event for a logical conjunction (I was looking > for > > something like `all-evt` or `every-evt`), which requires that all of its > > members be ready for synchronization at the same time? > > No. (Although `replavce-evt` is a weak kind of "and", it's not what > you're looking for.) > > > If not, is there a fundamental barrier to its implementation with the > > ConcurrentML approach? > > Yes, at least in the sense that it's not possible to implement N-way > rendezvous given only CML's rendezvous. > > So, N-way rendezvous would have to be implemented in the core. I'm > certain that some languages have implemented that, but I have forgotten > the examples. > > > Related to this, I've been reading "Kill-Safe Synchronization > Abstractions" > > (https://www.cs.utah.edu/plt/publications/pldi04-ff.pdf), and found it > > notable that the swap channel couldn't be implemented in a way that was > > both kill-safe and break-safe (not ruining `sync/enable-break`'s > > exclusive-or guarantee). I'm wondering if both forms of safety could be > > achieved by using a hypothetical `all-evt` that behaves as I've > described. > > Probably so. The citation of [17] in that part of the paper is meant to > allude to the CML-style rendezvous versus N-way rendezvous constraint. > > > Matthew > > -- > You received this message because you are subscribed to the Google Groups > "Racket Users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/racket-users/20210315155008.cc%40sirmail.smtps.cs.utah.edu > . > -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/racket-users/CAL3TdONtWDeMgWUzXB%3DWc-fN%3DRi2pj%2BMC7-kg5pWhJOc2bzgjA%40mail.gmail.com.
