On 10/3/2021 4:04 PM, 'William J. Bowman' via Racket Users wrote:
I'm trying to run sandboxes in places, but when the sandboxes need access to racket/gui (such as through 2htdp/universe), they get `cannot instantiate racket/gui/base' a second time`. I've tried initing racket/gui once in the server that starts the places, but this doesn't seem to work. (gui-available?) is still false in started places, and they still raise the exception when the sandbox tries to load the gui module. I don't really need to run gui code in the sandbox, so I'm guessing the best workaround is to override `2htdp/universe` in the sandbox. Anyone have either a solution, or a better workaround?
My (perhaps incorrect) understanding is that with dynamic (kernel thread) places, only the foreground place can have a GUI. I'm not sure why the gui package won't load in a background place, but it may not work right even if you can get it to load.
Just a suggestion: you might try using Paulo Matos's "Loci" package - it simulates dynamic places using separate processes. With Loci, the place is foreground in its own process, so it /might/ allow racket/gui to work.
https://pkgs.racket-lang.org/package/loci Hope this doesn't lead down a rabbit hole. 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 racket-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/racket-users/8079cbe0-3f78-e0f3-024f-9b47459b8706%40comcast.net.
