cffi-devel May 2009

cffi-devel@common-lisp.net

16 participants
12 discussions

[cffi-devel] Static vectors suitable for FFI
by Stelian Ionescu 11 May '09

11 May '09

Attached is an implementation for SBCL. make-static-vector only allocates instances of (simple-array (unsigned-byte 8) (*)) but that can be extended to other unboxed arrays. The current sharable vector interface doesn't work very well because it doesn't allow me for instance to pin a list of vectors, but only a single vector at a time. Also, I'd prefer to avoid pinning at all given how it interferes with the GC. -- Stelian Ionescu a.k.a. fe[nl]ix Quidquid latine dictum sit, altum videtur.

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[cffi-devel] Threads and function pointers misunderstanding
by Benjamin Tovar 10 May '09

10 May '09

Hi, I am writing an application that creates a callback in lisp (cffi:defcallback callback-lisp ...), and then passes the pointer to a C library with something like (set-callback-in-c (cffi:callback callback-lisp). In C, I assign the function pointer as follows: /* global variable */ void (*callback)(void); void set_callback_in_c(void (*callback_from_lisp)(void)) { callback = callback_from_lisp; } And call (*callback)()); as needed. Now, everything works nicely, unless I use threads in C (pthreads). With threads, the first time I call (*callback)()); it segfaults, as if the pointer to the function was not valid (it does get assigned). I have no clue of what is going on, since it seems that the threads are not sharing the information to the function pointer. What I am missing here? I have tried with both Allegro and SBCL, on a Debian "testing". Thanks!

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cffi-devel May 2009