From af64b199eda3dc0e3025c751a6f910ab074730ca Mon Sep 17 00:00:00 2001
From: Olivier Bellone <olivierbellone@users.noreply.github.com>
Date: Wed, 7 Jul 2021 11:40:03 -0700
Subject: [PATCH] Fix deadlock issue in thread pool (#2656)

---
 lib/puma/thread_pool.rb | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/puma/thread_pool.rb b/lib/puma/thread_pool.rb
index 8e25162c51..abada439fd 100644
--- a/lib/puma/thread_pool.rb
+++ b/lib/puma/thread_pool.rb
@@ -119,6 +119,7 @@ def spawn_thread
                 @trim_requested -= 1
                 @spawned -= 1
                 @workers.delete th
+                not_full.signal
                 Thread.exit
               end