From c43aa623435a277a692dbde784e8a7146f5573e9 Mon Sep 17 00:00:00 2001
From: Hennadii Stepanov <32963518+hebasto@users.noreply.github.com>
Date: Sat, 30 Oct 2021 19:33:09 +0300
Subject: [PATCH] Avoid excessive lock contention in CCheckQueue::Add

---
 src/checkqueue.h | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/src/checkqueue.h b/src/checkqueue.h
index 7c20e2013c3..d926326a959 100644
--- a/src/checkqueue.h
+++ b/src/checkqueue.h
@@ -167,12 +167,15 @@ public:
     //! Add a batch of checks to the queue
     void Add(std::vector<T>& vChecks)
     {
-        LOCK(m_mutex);
-        for (T& check : vChecks) {
-            queue.push_back(T());
-            check.swap(queue.back());
+        {
+            LOCK(m_mutex);
+            for (T& check : vChecks) {
+                queue.emplace_back();
+                check.swap(queue.back());
+            }
+            nTodo += vChecks.size();
         }
-        nTodo += vChecks.size();
+
         if (vChecks.size() == 1)
             m_worker_cv.notify_one();
         else if (vChecks.size() > 1)