What do you mean by "Tried using Racket function: filesystem-change-evt but that did not seem appropriate."? What's inappropriate about it?
My first thought is to initialize a variable with `#f`. Spawn a thread before the loop that uses `filesystem-change-evt` so that when the event that you are interested in occurs, mutate the variable to `#t`. In the loop, break from the loop when the variable is `#t`. I guess you can also poll `file-exists?` yourself in the thread, with some `sleep` between each polling. Related library: https://github.com/zyrolasting/file-watchers/ On Sat, Oct 2, 2021 at 4:25 PM Don Green <[email protected]> wrote: > Looking to trigger the end of a loop by the creation of a file. > Is this possible? Is this advisable? > Currently using: > a 'for' loop with > a 'for' loop guard expression to test for the existence of a file. > Tried file-exists? but that does not seem appropriate. > Tried using Racket function: filesystem-change-evt but that did not seem > appropriate. > Is it possible to trigger an end condition on a 'for' loop by the creation > of a file? > I suspect my problem is that it takes a significant amount of time for the > operating system to register the creation of a file. > So maybe the best that can be done is to use file-exists? as it works but > there a many loops of the 'for' loop before the end condition takes effect. > Any comments? > > -- > 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/adaf4e50-7430-4d2e-923a-5a0cdff24ebfn%40googlegroups.com > <https://groups.google.com/d/msgid/racket-users/adaf4e50-7430-4d2e-923a-5a0cdff24ebfn%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- 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/CADcueguT2p_qdN8fAAnxnsYK_E9k5dFcHGD9n9RLNREk-PD7qw%40mail.gmail.com.
