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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
//! This module contains the `EventLoop` type, which is the constellation's
//! view of a script thread. When an `EventLoop` is dropped, an `ExitScriptThread`
//! message is sent to the script thread, asking it to shut down.
use std::hash::Hash;
use std::marker::PhantomData;
use std::rc::Rc;
use std::sync::atomic::{AtomicUsize, Ordering};
use ipc_channel::Error;
use ipc_channel::ipc::IpcSender;
use script_traits::ScriptThreadMessage;
static CURRENT_EVENT_LOOP_ID: AtomicUsize = AtomicUsize::new(0);
/// <https://html.spec.whatwg.org/multipage/#event-loop>
pub struct EventLoop {
script_chan: IpcSender<ScriptThreadMessage>,
dont_send_or_sync: PhantomData<Rc<()>>,
id: usize,
}
impl PartialEq for EventLoop {
fn eq(&self, other: &Self) -> bool {
self.id == other.id
}
}
impl Eq for EventLoop {}
impl Hash for EventLoop {
fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
self.id.hash(state);
}
}
impl Drop for EventLoop {
fn drop(&mut self) {
let _ = self.script_chan.send(ScriptThreadMessage::ExitScriptThread);
}
}
impl EventLoop {
/// Create a new event loop from the channel to its script thread.
pub fn new(script_chan: IpcSender<ScriptThreadMessage>) -> Rc<EventLoop> {
let id = CURRENT_EVENT_LOOP_ID.fetch_add(1, Ordering::Relaxed);
Rc::new(EventLoop {
script_chan,
dont_send_or_sync: PhantomData,
id,
})
}
/// Send a message to the event loop.
pub fn send(&self, msg: ScriptThreadMessage) -> Result<(), Error> {
self.script_chan.send(msg)
}
}
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