Add api for scheduling plain futures in scheduler

src/lune/scheduler/impl_async.rs

@@ -0,0 +1,18 @@
+use futures_util::Future;
+
+use super::SchedulerImpl;
+
+impl SchedulerImpl {
+    /**
+        Schedules a plain future to run whenever the scheduler is available.
+    */
+    pub fn schedule_future<F>(&self, fut: F)
+    where
+        F: Future<Output = ()> + 'static,
+    {
+        self.futures
+            .try_lock()
+            .expect("Failed to lock futures queue")
+            .push(Box::pin(fut))
+    }
+}

src/lune/scheduler/impl_runner.rs

@@ -63,7 +63,7 @@ impl SchedulerImpl {
         let mut futs = self
             .futures
             .try_lock()
-            .expect("Failed to lock futures for resumption");
+            .expect("Failed to lock futures queue");
         while futs.next().await.is_some() {
             resumed_any = true;
             if self.has_thread() {

src/lune/scheduler/mod.rs

@@ -14,6 +14,7 @@ mod state;
 mod thread;
 mod traits;
 
+mod impl_async;
 mod impl_runner;
 mod impl_threads;