Hi,
What's the best way to declare an external C function that takes a function
pointer? I want to pass a Chapel implemented function or an externally
implemented function. I've done some research and experiments and haven't
found a good solution yet.
I originally (and naively) began with something like this in the Chapel
module:
proc ev_io_init_fn(ref loop: ev_loop_t, ref io: ev_io_t, x: c_int);
extern proc ev_io_init(ref io: ev_io_t, ref fn: ev_io_init_fn, fd: ev_fd_t,
events: ev_events_t);
and then in chpl:
export proc accept_cb(ref loop: ev_loop_t, ref watcher: ev_io_t, revents:
c_int) {
// do work
}
ev_io_init(w_accept, accept_cb, sd, EV_READ);
but this (and similar approaches) will produce a compilation error akin to:
chapel/chpl_tcp_server.chpl:38: error: unresolved call
'ev_io_init(c_ptr(ev_io_t),
chpl__fcf_type__ref_ev_loop_t__ref_ev_io_t_int32_t_void, int(32), int(32))'
[functionResolution.cpp:2448]
chapel/LibEv.chpl:75: note: candidates are: ev_io_init(io: c_ptr(ev_io_t),
ref fn: ev_io_init_fn, fd: ev_fd_t, events: ev_events_t) [128267]
[functionResolution.cpp:2463]
Thanks!
Brian
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