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use super::{Simulation, Worker};
use crate::app::UpdateTimer;
use anyhow::Result;
use std::{
sync::mpsc::{self, TryRecvError},
thread,
};
use triple_buffer::TripleBuffer;
impl<TSim: 'static + Simulation> Worker<TSim> {
pub fn new(create: fn() -> TSim) -> Result<Self> {
let (stop_sender, stop_receiver) = mpsc::channel();
let (mut input_buffer, output_buffer) =
TripleBuffer::new(TSim::SyncState::default()).split();
let should_continue = move || match stop_receiver.try_recv() {
Ok(_) | Err(TryRecvError::Disconnected) => false,
_ => true,
};
let join_handle = thread::Builder::new()
.name("simulation thread".to_owned())
.spawn(move || {
let mut simulation = create();
let mut update_timer = UpdateTimer::new("Sim Timer");
simulation.setup(&mut input_buffer);
while should_continue() {
let tick_time =
update_timer.throttled_tick(TSim::TICK_THROTTLE);
simulation.tick(&mut input_buffer, tick_time);
}
})?;
Ok(Self {
join_handle: Some(join_handle),
stop_sender,
output_buffer,
})
}
pub fn state(&mut self) -> &TSim::SyncState {
self.output_buffer.read()
}
}
impl<TSim: Simulation> Drop for Worker<TSim> {
fn drop(&mut self) {
log::trace!("waiting for sim to drop");
self.stop_sender
.send(())
.expect("unable to send a stop signal to the simulation thread");
self.join_handle
.take()
.unwrap()
.join()
.expect("unable to join the simulation thread");
}
}