From 28a500b7b636ae53a56356dcfd327ee658bbb534 Mon Sep 17 00:00:00 2001
From: gucio321 <73652197+gucio321@users.noreply.github.com>
Date: Sat, 5 Feb 2022 11:50:44 +0100
Subject: [PATCH] mainthread: add IsRunning method

fix #3
---
 mainthread.go | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/mainthread.go b/mainthread.go
index 7964520..3dd7932 100644
--- a/mainthread.go
+++ b/mainthread.go
@@ -11,16 +11,14 @@ import (
 // The default value is 16 and should be good for 99% usecases.
 var CallQueueCap = 16
 
-var (
-	callQueue chan func()
-)
+var callQueue chan func()
 
 func init() {
 	runtime.LockOSThread()
 }
 
 func checkRun() {
-	if callQueue == nil {
+	if !IsRunning() {
 		panic(errors.New("mainthread: did not call Run"))
 	}
 }
@@ -48,6 +46,12 @@ func Run(run func()) {
 	}
 }
 
+// IsRunning returns true if the Run function has already
+// been called and is running.
+func IsRunning() bool {
+	return callQueue != nil
+}
+
 // CallNonBlock queues function f on the main thread and returns immediately. Does not wait until f
 // finishes.
 func CallNonBlock(f func()) {