Il giorno sab, 04/09/2021 alle 15.35 +0200, Vivien Kraus via General Guile related discussions ha scritto: > Hello, > > Le samedi 04 septembre 2021 à 07:41 -0500, Tim Meehan a écrit : > > I'd rather not compile anything in C, and just use the tools in > > Guile to > > interact with libgps. Is there a way to get Guile's garbage > > collector to > > call "gps_close" on the opaque structure returned by "gps_open"? > I think it would be best to do it yourself. Maybe the garbage > collector will not run immediately (if at all), and if each creation > uses "precious" resources (such as file descriptors), you might run > into a shortage before the garbage collector is triggered. This is > not considered by people writing the C API of course, because they > assume you would close the thing as soon as possible. (Also, if > calling the close function is mandatory, for instance to run code > that’s not just freeing resources, and the garbage collector does not > have a chance to run, then it’s another problem. However, I > doubt your library does something like that). > > If you want to avoid the problem, you should explicitely bind and > call the gps-close function and not rely on the garbage collector to > do it for you. You can use dynamic-wind to open and close > resources as needed.
It'd be so nice to have an example > That being said, make-pointer (from (system foreign-library)) is > probably what you are expecting. It should work with gps_close. Another exmple of what you mean, here, would be so nice :-)
