validation: use a lock for CCheckQueueControl

Uses an RAII lock for the exact same behavior as the old critical sections.

Co-authored-by: Ryan Ofsky <ryan@ofsky.org>

src/checkqueue.h

@@ -205,20 +205,18 @@ public:
  * queue is finished before continuing.
  */
 template <typename T, typename R = std::remove_cvref_t<decltype(std::declval<T>()().value())>>
-class CCheckQueueControl
+class SCOPED_LOCKABLE CCheckQueueControl
 {
 private:
     CCheckQueue<T, R>& m_queue;
+    UniqueLock<Mutex> m_lock;
     bool fDone;
 
 public:
     CCheckQueueControl() = delete;
     CCheckQueueControl(const CCheckQueueControl&) = delete;
     CCheckQueueControl& operator=(const CCheckQueueControl&) = delete;
-    explicit CCheckQueueControl(CCheckQueue<T>& queueIn) : m_queue(queueIn), fDone(false)
+    explicit CCheckQueueControl(CCheckQueue<T>& queueIn) EXCLUSIVE_LOCK_FUNCTION(queueIn.m_control_mutex) : m_queue(queueIn), m_lock(LOCK_ARGS(queueIn.m_control_mutex)), fDone(false) {}
-    {
-        ENTER_CRITICAL_SECTION(m_queue.m_control_mutex);
-    }
 
     std::optional<R> Complete()
     {
@@ -232,11 +230,10 @@ public:
         m_queue.Add(std::move(vChecks));
     }
 
-    ~CCheckQueueControl()
+    ~CCheckQueueControl() UNLOCK_FUNCTION()
     {
         if (!fDone)
             Complete();
-        LEAVE_CRITICAL_SECTION(m_queue.m_control_mutex);
     }
 };