From 78ea8ad425f2dc650b07e33d4724bbb21a9d1f17 Mon Sep 17 00:00:00 2001
From: Vladislav Vaintroub <wlad@mariadb.com>
Date: Mon, 10 Aug 2020 18:03:05 +0000
Subject: [PATCH] MDEV-23378 - fix an alleged memory "leak" in threadpool.

Implement a workaround to shut the "memory not freed" message.
---
 sql/threadpool_generic.cc | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/sql/threadpool_generic.cc b/sql/threadpool_generic.cc
index 02eb336facb..78b57340a6b 100644
--- a/sql/threadpool_generic.cc
+++ b/sql/threadpool_generic.cc
@@ -1084,7 +1084,10 @@ void thread_group_destroy(thread_group_t *thread_group)
 #endif
 
   if (my_atomic_add32(&shutdown_group_count, -1) == 1)
+  {
     my_free(all_groups);
+    all_groups= 0;
+  }
 }
 
 /**
@@ -1677,6 +1680,14 @@ TP_pool_generic::~TP_pool_generic()
   {
     thread_group_close(&all_groups[i]);
   }
+
+  /*
+    Wait until memory occupied by all_groups is freed.
+  */
+  int timeout_ms=5000;
+  while(all_groups && timeout_ms--)
+    my_sleep(1000);
+
   threadpool_started= false;
   DBUG_VOID_RETURN;
 }