From 37f625b0af0b5e818de97b83dd96709df118ad6b Mon Sep 17 00:00:00 2001
From: Peter van Dijk <peter.van.dijk@powerdns.com>
Date: Sun, 11 Sep 2022 13:31:02 +0200
Subject: [PATCH] auth LUA records: we only need one IsUpOracle checker thread

---
 pdns/lua-record.cc | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/pdns/lua-record.cc b/pdns/lua-record.cc
index 16ad0b9e70..c13373b79f 100644
--- a/pdns/lua-record.cc
+++ b/pdns/lua-record.cc
@@ -76,7 +76,7 @@ private:
   };
 
 public:
-  IsUpOracle()
+  IsUpOracle(): d_checkerThreadStarted(ATOMIC_FLAG_INIT)
   {
   }
   ~IsUpOracle()
@@ -203,6 +203,7 @@ private:
   SharedLockGuarded<statuses_t> d_statuses;
 
   std::unique_ptr<std::thread> d_checkerThread;
+  std::atomic_flag d_checkerThreadStarted;
 
   void setStatus(const CheckDesc& cd, bool status)
   {
@@ -240,7 +241,7 @@ private:
 
 bool IsUpOracle::isUp(const CheckDesc& cd)
 {
-  if (!d_checkerThread) {
+  if (!d_checkerThreadStarted.test_and_set()) {
     d_checkerThread = std::make_unique<std::thread>([this] { return checkThread(); });
   }
   time_t now = time(nullptr);
-- 
2.47.2