fix: Don't require tokio rt-multi-thread feature (#290)

platforms/unix/Cargo.toml

@@ -23,6 +23,6 @@ atspi = { version = "0.10.1", default-features = false }
 futures-lite = "1.12.0"
 once_cell = { version = "1.17.1", optional = true }
 serde = "1.0"
-tokio = { version = "1.10.0", optional = true, features = ["rt-multi-thread", "net", "time"] }
+tokio = { version = "1.10.0", optional = true, features = ["rt", "net", "time"] }
 zbus = { version = "3.6", default-features = false }
 

platforms/unix/src/util.rs

@@ -15,13 +15,24 @@ pub(crate) fn block_on<F: std::future::Future>(future: F) -> F::Output {
 }
 
 #[cfg(feature = "tokio")]
-pub(crate) static TOKIO_RT: Lazy<tokio::runtime::Runtime> = Lazy::new(|| {
-    tokio::runtime::Builder::new_multi_thread()
-        .worker_threads(1)
-        .enable_io()
-        .enable_time()
+pub(crate) static TOKIO_RT: Lazy<tokio::runtime::Handle> = Lazy::new(|| {
+    let rt = tokio::runtime::Builder::new_current_thread()
+        .enable_all()
         .build()
-        .expect("launch of single-threaded tokio runtime")
+        .expect("create tokio runtime");
+    let handle = rt.handle().clone();
+    std::thread::Builder::new()
+        .name("accesskit-tokio".into())
+        .spawn(move || {
+            rt.block_on(async {
+                let duration = std::time::Duration::from_secs(86400);
+                loop {
+                    tokio::time::sleep(duration).await;
+                }
+            });
+        })
+        .expect("launch tokio runtime thread");
+    handle
 });
 
 #[cfg(feature = "tokio")]