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|
// xfail-win32
// A port of task-killjoin to use a class with a dtor to manage
// the join.
extern mod std;
struct notify {
ch: comm::Chan<bool>, v: @mut bool,
drop {
error!("notify: task=%? v=%x unwinding=%b b=%b",
task::get_task(),
ptr::addr_of(&(*(self.v))) as uint,
task::failing(),
*(self.v));
let b = *(self.v);
comm::send(self.ch, b);
}
}
fn notify(ch: comm::Chan<bool>, v: @mut bool) -> notify {
notify {
ch: ch,
v: v
}
}
fn joinable(+f: fn~()) -> comm::Port<bool> {
fn wrapper(+c: comm::Chan<bool>, +f: fn()) {
let b = @mut false;
error!("wrapper: task=%? allocated v=%x",
task::get_task(),
ptr::addr_of(&(*b)) as uint);
let _r = notify(c, b);
f();
*b = true;
}
let p = comm::Port();
let c = comm::Chan(&p);
do task::spawn_unlinked { wrapper(c, copy f) };
p
}
fn join(port: comm::Port<bool>) -> bool {
comm::recv(port)
}
fn supervised() {
// Yield to make sure the supervisor joins before we
// fail. This is currently not needed because the supervisor
// runs first, but I can imagine that changing.
error!("supervised task=%?", task::get_task);
task::yield();
fail;
}
fn supervisor() {
error!("supervisor task=%?", task::get_task());
let t = joinable(supervised);
join(t);
}
fn main() {
join(joinable(supervisor));
}
// Local Variables:
// mode: rust;
// fill-column: 78;
// indent-tabs-mode: nil
// c-basic-offset: 4
// buffer-file-coding-system: utf-8-unix
// End:
|
