Block scheduler if another one is already running

Cargo.lock

@@ -1020,7 +1020,7 @@ dependencies = [
 
 [[package]]
 name = "kon"
-version = "0.3.8"
+version = "0.3.9"
 dependencies = [
  "bb8",
  "bb8-postgres",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "kon"
-version = "0.3.8"
+version = "0.3.9"
 edition = "2021"
 
 [dependencies]

src/main.rs

@@ -17,7 +17,13 @@ use crate::{
 
 use std::{
   thread::current,
-  sync::Arc
+  sync::{
+    Arc,
+    atomic::{
+      AtomicBool,
+      Ordering
+    }
+  }
 };
 use poise::serenity_prelude::{
   builder::{
@@ -35,6 +41,7 @@ use poise::serenity_prelude::{
 };
 
 type Error = Box<dyn std::error::Error + Send + Sync>;
+static TASK_RUNNING: AtomicBool = AtomicBool::new(false);
 
 async fn on_ready(
   ctx: &Context,
@@ -123,17 +130,24 @@ async fn event_processor(
 
       let ctx = Arc::new(ctx.clone());
 
-      tokio::spawn(async move {
-        match internals::tasks::rss::rss(ctx).await {
-          Ok(_) => {},
-          Err(y) => {
-            eprintln!("TaskScheduler[Main:RSS:Error]: Task execution failed: {}", y);
-            if let Some(source) = y.source() {
-              eprintln!("TaskScheduler[Main:RSS:Error]: Task execution failed caused by: {:#?}", source);
+      if !TASK_RUNNING.load(Ordering::SeqCst) {
+        TASK_RUNNING.store(true, Ordering::SeqCst);
+
+        tokio::spawn(async move {
+          match internals::tasks::rss::rss(ctx).await {
+            Ok(_) => {},
+            Err(y) => {
+              eprintln!("TaskScheduler[Main:RSS:Error]: Task execution failed: {}", y);
+              if let Some(source) = y.source() {
+                eprintln!("TaskScheduler[Main:RSS:Error]: Task execution failed caused by: {:#?}", source);
+              }
             }
           }
-        }
-      });
+          TASK_RUNNING.store(false, Ordering::SeqCst);
+        });
+      } else {
+        println!("TaskScheduler[Main:RSS:Notice]: Another thread is already running this task, ignoring");
+      }
     }
     _ => {}
   }