[Chicken-users] ffi howto
Hello, I need some help getting started with ffi. I am attempting to bind libuv to scheme code. My chicken scheme code at http://pastebin.com/bwja0yet fails with the following error. The following code fails with the following: Error: bad argument count - received 152135942 but expected 2: 0 Call history: uv.scm:33: uv-default-loop uv.scm:33: uv-idle-init uv.scm:34: uv-idle-start uv.scm:36: uv-default-loop uv.scm:36: uv-run -- I am attempting to port the following C code. http://pastebin.com/63gP8HFT - Omar ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users
Re: [Chicken-users] ffi howto
Hello Omar, The problem with your code is that wait-for-a-while must be declared as an external function; like so: (define-external (wait_for_a_while ((c-pointer uv-idle-t) handle)) void (let lp ((counter 0)) (if (= counter 1000) (uv-idle-stop handle) (lp (+ counter 1) note that the name of the function must be a valid C function name, so it cannot be dash-seperated. Also looking at the libub documentation, the callback did not have a status argument. An external function that is going to call such a callback function must be declared using 'foreign-safe-lambda' instead of 'foreign-lambda'. Thus uv-run must be declared as such: (define uv-run (foreign-safe-lambda int uv_run (c-pointer uv-loop-t) int)) Hope this helps and good luck, Richard chicken-us...@shorbaji.com writes: Hello, I need some help getting started with ffi. I am attempting to bind libuv to scheme code. My chicken scheme code at http://pastebin.com/bwja0yet fails with the following error. The following code fails with the following: Error: bad argument count - received 152135942 but expected 2: 0 Call history: uv.scm:33: uv-default-loop uv.scm:33: uv-idle-init uv.scm:34: uv-idle-start uv.scm:36: uv-default-loop uv.scm:36: uv-run -- I am attempting to port the following C code. http://pastebin.com/63gP8HFT - Omar ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users -- ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users
Re: [Chicken-users] ffi howto
Hello again, I forgot something, as uv-idle-start takes a pointer as its second argument the function must be called with like so: (uv-idle-start idler-ref (location wait_for_a_while)) cheers, Richard Richard writes: Hello Omar, The problem with your code is that wait-for-a-while must be declared as an external function; like so: (define-external (wait_for_a_while ((c-pointer uv-idle-t) handle)) void (let lp ((counter 0)) (if (= counter 1000) (uv-idle-stop handle) (lp (+ counter 1) note that the name of the function must be a valid C function name, so it cannot be dash-seperated. Also looking at the libub documentation, the callback did not have a status argument. An external function that is going to call such a callback function must be declared using 'foreign-safe-lambda' instead of 'foreign-lambda'. Thus uv-run must be declared as such: (define uv-run (foreign-safe-lambda int uv_run (c-pointer uv-loop-t) int)) Hope this helps and good luck, Richard chicken-us...@shorbaji.com writes: Hello, I need some help getting started with ffi. I am attempting to bind libuv to scheme code. My chicken scheme code at http://pastebin.com/bwja0yet fails with the following error. The following code fails with the following: Error: bad argument count - received 152135942 but expected 2: 0 Call history: uv.scm:33: uv-default-loop uv.scm:33: uv-idle-init uv.scm:34: uv-idle-start uv.scm:36: uv-default-loop uv.scm:36: uv-run -- I am attempting to port the following C code. http://pastebin.com/63gP8HFT - Omar ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users -- ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users
[Chicken-users] Working on Geiser integration
As a follow-up to my earlier inquiries regarding SLIME, I'd like to notify those who were interested that I've opted to instead work on Geiser support. The path to full support seems a little easier and, IMHO, the integration with Scheme is more natural. AFAICT, previous efforts to support Chicken in Geiser have been abandoned and never made it much farther than launching the interpreter. Please inform me if I am mistaken in this regard. My efforts are here: https://github.com/dleslie/geiser Currently, CAPF is working, so by extension I expect ac-geiser works as well, though I haven't tried yet. I expect to have the bulk of the remaining work done in the next few weeks, as I have a whole lot of free time. At the moment there's a three week old little girl wrapped to my chest, and I've been taking the long night shifts for bottle feeding which give me plenty of time to hack. Take care, -Dan PS- I cross-posted to chicken-hackers because I believe this is relevant to those who may be able to provide some advice in sussing out the internals. ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users
