tls.rs

/**
 * Because I have a large number of foriegn callback functions to wrap it'd be
 * great I you could use a generic handle for local data setting and getting.
 * Unfortunately when I try this I get:
 *
 *     generic_tls.rs:23:64: 12:65 error: unexpected token: `,`
 *     generic_tls.rs:23     unsafe { task::local_data::local_data_set(tls_handle<FooFun>, cbfun); }
 *
 */

// #[nolink]
// extern mod bindings {
//     fn setFooCallback(cbfun: *u8);
// }

// A generic function used to make space in TLS
fn tls_handle<T>(_v: @T) {}

type FooFun = @fn(x: int);

pub fn set_foo_callback(cbfun: @FooFun) {
    unsafe { task::local_data::local_data_set(tls_handle<FooFun>, cbfun); }
    // bindings::setFooCallback(foo_callback)
}

extern fn foo_callback(x: libc::c_int) -> c_int {
    unsafe {
        match task::local_data::local_data_get(tls_handle<FooFun>) {
            Some(f) => { (*f)(x as int) }
            None => {}
        }
    }
}

fn main() {
    set_foo_callback(|x| io::println(fmt!("x = %d", x)));
}