Maybe I need more coffee, but a possible heads-up: The current implementation doesn't seem to match the documentation -- wouldn't the with-handlers need to move inside the loop, for it to be infinite?
https://github.com/Kalimehtar/thread-utils/blob/master/main.rkt#L35-L41 On Tuesday, May 19, 2020 at 9:11:54 PM UTC-4, David Storrs wrote: > > Perfect, thank you. > > On Tue, May 19, 2020 at 5:28 PM George Neuner <[email protected] > <javascript:>> wrote: > >> On Tue, 19 May 2020 12:01:54 -0400, David Storrs >> <[email protected] <javascript:>> wrote: >> >> >I'm using the file-watchers module to keep an eye on a directory tree and >> >trigger various actions whenever something changes. I had an issue where >> >an exception was thrown, the thread died, and file watching therefore >> >stopped. The immediate solution is to wrap a with-handlers around it so >> it >> >doesn't end up killing the thread, but this made me wonder if there's an >> >easy way to do this automatically? >> > >> >What I'm thinking of is "Create a thread that will do something in a >> loop. >> >Ensure that the thread remains running and restart it if it dies for any >> >reason. Also, make sure that it runs periodically." I can think of a >> >solution involving multiple threads, channels, and polling to ensure that >> >the 'daemonized' threads are running, but I was wondering if there's a >> >built-in or existing answer. >> >> There is a package called "thread-utils" which claims error safe >> looping threads. >> https://pkgs.racket-lang.org/package/thread-utils >> >> *Disclaimer* I have never tried it. >> >> >> I can think of a some possible implementations, but they all involve >> monitoring by a separate thread (which could be the main thread). >> Channels aren't necessary - monitoring can be done using events. >> >> Restarting a (possibly failed) computation IN a running thread is >> relatively simple - if you know what errors or events might occur. The >> problem is that a thread can't restart itself if somehow it gets >> suspended or killed. >> >> George >> >> -- >> 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] <javascript:>. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/racket-users/uvi8cftuuvfkq0cqm27m0icvhhq5mpupuo%404ax.com >> . >> > -- 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/a1eba505-25f5-4ced-8f40-644fbced1e07%40googlegroups.com.
