From e27ce40e1b291a6fe4309473a7a96024d6f24b02 Mon Sep 17 00:00:00 2001
From: Jeremy Evans <code@jeremyevans.net>
Date: Mon, 18 Jul 2022 11:29:14 -0700
Subject: [PATCH] Avoid creating an unnecessary thread pool

If the thread_pool does not already exist, there is no point in
creating a thread pool just to join the threads in it.

This is an alternative fix for #440.
---
 lib/rake/application.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/rake/application.rb b/lib/rake/application.rb
index 02586ad5e..d4e2680f6 100644
--- a/lib/rake/application.rb
+++ b/lib/rake/application.rb
@@ -124,7 +124,7 @@ def run_with_threads
 
       yield
 
-      thread_pool.join
+      thread_pool.join if defined?(@thread_pool)
       if options.job_stats
         stats = thread_pool.statistics
         puts "Maximum active threads: #{stats[:max_active_threads]} + main"