Add newEventLoopScheduledThread method to NettyScheduler and update thread factory in EventLoopScheduler

Author: franz1981

core/src/main/java/io/netty/loom/EventLoopScheduler.java

@@ -88,10 +88,14 @@ public EventLoopScheduler(IoEventLoopGroup parent, ThreadFactory threadFactory,
 	}
 
 	private static ThreadFactory newEventLoopSchedulerFactory(SharedRef sharedRef) {
-		var rawVTFactory = Thread.ofVirtual().attach(sharedRef).factory();
-		return runnable -> rawVTFactory.newThread(() -> ScopedValue
+		// in the future we could create a SchedulerAssignment object a with modifiable
+		// SharedRef into
+		// and share it between the thread attachment and the SchedulingContext,
+		// enabling
+		// work-stealing to change it for both
+		return runnable -> NettyScheduler.newEventLoopScheduledThread(() -> ScopedValue
 				.where(CURRENT_SCHEDULER, new SchedulingContext(Thread.currentThread().threadId(), sharedRef))
-				.run(runnable));
+				.run(runnable), sharedRef);
 	}
 
 	int externalContinuationsCount() {

core/src/main/java/io/netty/loom/NettyScheduler.java

@@ -117,6 +117,10 @@ public void onContinue(Thread.VirtualThreadTask virtualThreadTask) {
 		jdkBuildinScheduler.onContinue(virtualThreadTask);
 	}
 
+	static Thread newEventLoopScheduledThread(Runnable task, SharedRef sharedRef) {
+		return ensureInstalled().newThread(task, sharedRef);
+	}
+
 	public static boolean perCarrierPollers() {
 		return ensureInstalled().perCarrierPollers;
 	}