From 4266966eeef44dfce422b9703692e519678610c6 Mon Sep 17 00:00:00 2001
From: Nathan Froyd <froydnj@mozilla.com>
Date: Wed, 4 Sep 2019 17:55:04 +0200
Subject: Kill newly-spawned threads if we're shutting down.

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

(limited to 'xpcom/threads')

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
-- 
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