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std::{rc::Rc, sync::Arc}; + +use mlua::prelude::*; +use smol::*; + +struct LuaSmol<'ex> { + lua_exec: Rc>, + main_exec: Arc>, +} + +// HACK: self_cell is not actually used to make a self-referential struct here, +// it is instead used to guarantee the lifetime of the executors. It does not +// need to refer to Lua during construction at all but the end result is the +// same and we let the self_cell crate handle all the unsafe code for us. +self_cell::self_cell!( + struct LuaExecutorInner { + owner: Rc, + + #[not_covariant] + dependent: LuaSmol, + } +); + +impl LuaExecutorInner { + fn create(lua: Rc) -> Self { + LuaExecutorInner::new(lua, |_| { + let lua_exec = Rc::new(LocalExecutor::new()); + let main_exec = Arc::new(Executor::new()); + LuaSmol { + lua_exec, + main_exec, + } + }) + } +} + +pub struct LuaExecutor { + _lua: Rc, + inner: LuaExecutorInner, +} + +impl LuaExecutor { + pub fn new(lua: Rc) -> Self { + Self { + _lua: Rc::clone(&lua), + inner: LuaExecutorInner::create(lua), + } + } + + pub fn run<'outer_fn, F>(&'outer_fn self, futures_spawner: F) -> LuaResult<()> + where + F: for<'lua> FnOnce( + &'lua Lua, + &'outer_fn LocalExecutor<'lua>, + &'outer_fn Executor<'lua>, + ) -> LuaResult<()>, + { + self.inner.with_dependent(|lua, rt_executors| { + // 1. Spawn futures using the provided function + let lua_exec = &rt_executors.lua_exec; + let main_exec = &rt_executors.main_exec; + futures_spawner(lua, lua_exec, main_exec)?; + // 2. Run them all until lua executor completes + block_on(main_exec.run(async { + while !lua_exec.is_empty() { + lua_exec.tick().await; + } + })); + // 3. Yay! + Ok(()) + }) + } +} diff --git a/src/smol/mod.rs b/src/smol/mod.rs new file mode 100644 index 0000000..d1c9cd2 --- /dev/null +++ b/src/smol/mod.rs @@ -0,0 +1,58 @@ +use std::{ + rc::Rc, + time::{Duration, Instant}, +}; + +use mlua::prelude::*; +use smol::*; + +const NUM_TEST_BATCHES: usize = 20; +const NUM_TEST_THREADS: usize = 50_000; + +const MAIN_CHUNK: &str = r#" +wait(0.01 * math.random()) +"#; + +mod executor; +use executor::*; + +pub fn main() -> LuaResult<()> { + let lua = Rc::new(Lua::new()); + let rt = LuaExecutor::new(Rc::clone(&lua)); + + lua.globals().set( + "wait", + lua.create_async_function(|_, duration: f64| async move { + let before = Instant::now(); + let after = Timer::after(Duration::from_secs_f64(duration)).await; + Ok((after - before).as_secs_f64()) + })?, + )?; + + let start = Instant::now(); + let main_fn = lua.load(MAIN_CHUNK).into_function()?; + + for _ in 0..NUM_TEST_BATCHES { + rt.run(|lua, lua_exec, _| { + // TODO: Figure out how to create a scheduler queue that we can + // append threads to, both front and back, and resume them in order + + for _ in 0..NUM_TEST_THREADS { + let thread = lua.create_thread(main_fn.clone())?; + let task = lua_exec.spawn(async move { + if let Err(err) = thread.into_async::<_, ()>(()).await { + println!("error: {}", err); + } + Ok::<_, LuaError>(()) + }); + task.detach(); + } + + Ok(()) + })?; + } + + println!("elapsed: {:?}", start.elapsed()); + + Ok(()) +}