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// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use libc::c_int;
use option::Some;
use rt::uv::uvll;
use rt::uv::{Watcher, Loop, NativeHandle, IdleCallback, NullCallback};
use rt::uv::status_to_maybe_uv_error;
pub struct IdleWatcher(*uvll::uv_idle_t);
impl Watcher for IdleWatcher { }
impl IdleWatcher {
pub fn new(loop_: &mut Loop) -> IdleWatcher {
unsafe {
let handle = uvll::idle_new();
assert!(handle.is_not_null());
assert!(0 == uvll::idle_init(loop_.native_handle(), handle));
let mut watcher: IdleWatcher = NativeHandle::from_native_handle(handle);
watcher.install_watcher_data();
return watcher
}
}
pub fn start(&mut self, cb: IdleCallback) {
{
let data = self.get_watcher_data();
data.idle_cb = Some(cb);
}
unsafe {
assert!(0 == uvll::idle_start(self.native_handle(), idle_cb))
};
extern fn idle_cb(handle: *uvll::uv_idle_t, status: c_int) {
let mut idle_watcher: IdleWatcher = NativeHandle::from_native_handle(handle);
let data = idle_watcher.get_watcher_data();
let cb: &IdleCallback = data.idle_cb.get_ref();
let status = status_to_maybe_uv_error(handle, status);
(*cb)(idle_watcher, status);
}
}
pub fn stop(&mut self) {
// NB: Not resetting the Rust idle_cb to None here because `stop` is
// likely called from *within* the idle callback, causing a use after
// free
unsafe {
assert!(0 == uvll::idle_stop(self.native_handle()));
}
}
pub fn close(self, cb: NullCallback) {
{
let mut this = self;
let data = this.get_watcher_data();
assert!(data.close_cb.is_none());
data.close_cb = Some(cb);
}
unsafe { uvll::close(self.native_handle(), close_cb) };
extern fn close_cb(handle: *uvll::uv_idle_t) {
unsafe {
let mut idle_watcher: IdleWatcher = NativeHandle::from_native_handle(handle);
{
let data = idle_watcher.get_watcher_data();
data.close_cb.swap_unwrap()();
}
idle_watcher.drop_watcher_data();
uvll::idle_delete(handle);
}
}
}
}
impl NativeHandle<*uvll::uv_idle_t> for IdleWatcher {
fn from_native_handle(handle: *uvll::uv_idle_t) -> IdleWatcher {
IdleWatcher(handle)
}
fn native_handle(&self) -> *uvll::uv_idle_t {
match self { &IdleWatcher(ptr) => ptr }
}
}
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