From be98cb90b78a2d3b2cef273feb4d50f27e0bfb4b Mon Sep 17 00:00:00 2001
From: Fedor <fedor@mail.ru>
Date: Fri, 20 Sep 2019 13:11:52 +0300
Subject: [PATCH] Kill newly-spawned threads if we're shutting down.

---
 xpcom/threads/nsThreadPool.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/xpcom/threads/nsThreadPool.cpp b/xpcom/threads/nsThreadPool.cpp
index 241fad39d..eb967870a 100644
--- a/xpcom/threads/nsThreadPool.cpp
+++ b/xpcom/threads/nsThreadPool.cpp
@@ -112,7 +112,9 @@ nsThreadPool::PutEvent(already_AddRefed<nsIRunnable> aEvent, uint32_t aFlags)
   bool killThread = false;
   {
     MutexAutoLock lock(mMutex);
-    if (mThreads.Count() < (int32_t)mThreadLimit) {
+    if (mShutdown) {
+      killThread = true;  // we're in shutdown, kill the thread
+    } else if (mThreads.Count() < (int32_t)mThreadLimit) {
       mThreads.AppendObject(thread);
     } else {
       killThread = true;  // okay, we don't need this thread anymore