Add a calloop futures executor

Cargo.lock

@@ -474,7 +474,9 @@ version = "0.12.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7b50b5a44d59a98c55a9eeb518f39bf7499ba19fd98ee7d22618687f3f10adbf"
 dependencies = [
+ "async-task",
  "bitflags 2.4.1",
+ "futures-io",
  "log",
  "polling 3.3.1",
  "rustix 0.38.28",
@@ -1700,6 +1702,7 @@ dependencies = [
  "async-channel",
  "async-io 1.13.0",
  "bitflags 2.4.1",
+ "calloop",
  "clap",
  "directories",
  "git-version",

Cargo.toml

@@ -39,6 +39,7 @@ arrayvec = "0.7.4"
 async-channel = { version = "2.1.1", optional = true }
 async-io = { version = "1.13.0", optional = true }
 bitflags = "2.4.1"
+calloop = { version = "0.12.3", features = ["executor", "futures-io"] }
 clap = { version = "4.4.13", features = ["derive"] }
 directories = "5.0.1"
 git-version = "0.3.9"

src/niri.rs

@@ -10,6 +10,7 @@ use std::{env, mem, thread};
 
 use _server_decoration::server::org_kde_kwin_server_decoration_manager::Mode as KdeDecorationsMode;
 use anyhow::Context;
+use calloop::futures::Scheduler;
 use niri_config::{Config, TrackLayout};
 use smithay::backend::allocator::Fourcc;
 use smithay::backend::renderer::element::solid::{SolidColorBuffer, SolidColorRenderElement};
@@ -112,6 +113,7 @@ pub struct Niri {
     pub config: Rc<RefCell<Config>>,
 
     pub event_loop: LoopHandle<'static, State>,
+    pub scheduler: Scheduler<()>,
     pub stop_signal: LoopSignal,
     pub display_handle: DisplayHandle,
     pub socket_name: OsString,
@@ -742,6 +744,9 @@ impl Niri {
     ) -> Self {
         let _span = tracy_client::span!("Niri::new");
 
+        let (executor, scheduler) = calloop::futures::executor().unwrap();
+        event_loop.insert_source(executor, |_, _, _| ()).unwrap();
+
         let display_handle = display.handle();
         let config_ = config.borrow();
 
@@ -884,6 +889,7 @@ impl Niri {
             config,
 
             event_loop,
+            scheduler,
             stop_signal,
             socket_name,
             display_handle,