From 5a933cefcc5e0595a1ec46fc5ea287aa163ecd3f Mon Sep 17 00:00:00 2001
From: Matt Corallo <git@bluematt.me>
Date: Mon, 4 Dec 2017 18:31:36 -0500
Subject: [PATCH] Add an interface to get the queue depth out of
 CValidationInterface

---
 src/scheduler.cpp           | 5 +++++
 src/scheduler.h             | 2 ++
 src/validationinterface.cpp | 5 +++++
 src/validationinterface.h   | 2 ++
 4 files changed, 14 insertions(+)

diff --git a/src/scheduler.cpp b/src/scheduler.cpp
index 260f6fa60e7..7d5ec146103 100644
--- a/src/scheduler.cpp
+++ b/src/scheduler.cpp
@@ -206,3 +206,8 @@ void SingleThreadedSchedulerClient::EmptyQueue() {
         should_continue = !m_callbacks_pending.empty();
     }
 }
+
+size_t SingleThreadedSchedulerClient::CallbacksPending() {
+    LOCK(m_cs_callbacks_pending);
+    return m_callbacks_pending.size();
+}
diff --git a/src/scheduler.h b/src/scheduler.h
index b99f1653434..39ecb849b9d 100644
--- a/src/scheduler.h
+++ b/src/scheduler.h
@@ -108,6 +108,8 @@ public:
     // Processes all remaining queue members on the calling thread, blocking until queue is empty
     // Must be called after the CScheduler has no remaining processing threads!
     void EmptyQueue();
+
+    size_t CallbacksPending();
 };
 
 #endif
diff --git a/src/validationinterface.cpp b/src/validationinterface.cpp
index abbd8cc4d2b..1ddff4b335b 100644
--- a/src/validationinterface.cpp
+++ b/src/validationinterface.cpp
@@ -54,6 +54,11 @@ void CMainSignals::FlushBackgroundCallbacks() {
     }
 }
 
+size_t CMainSignals::CallbacksPending() {
+    if (!m_internals) return 0;
+    return m_internals->m_schedulerClient.CallbacksPending();
+}
+
 void CMainSignals::RegisterWithMempoolSignals(CTxMemPool& pool) {
     pool.NotifyEntryRemoved.connect(boost::bind(&CMainSignals::MempoolEntryRemoved, this, _1, _2));
 }
diff --git a/src/validationinterface.h b/src/validationinterface.h
index 7b5d138414d..164059e3b9e 100644
--- a/src/validationinterface.h
+++ b/src/validationinterface.h
@@ -131,6 +131,8 @@ public:
     /** Call any remaining callbacks on the calling thread */
     void FlushBackgroundCallbacks();
 
+    size_t CallbacksPending();
+
     /** Register with mempool to call TransactionRemovedFromMempool callbacks */
     void RegisterWithMempoolSignals(CTxMemPool& pool);
     /** Unregister with mempool */