3 files changed, 26 insertions, 2 deletions
diff --git a/src/cryptonote_core/blockchain.cpp b/src/cryptonote_core/blockchain.cpp
index 64694fe81..174e1a038 100644
--- a/src/cryptonote_core/blockchain.cpp
+++ b/src/cryptonote_core/blockchain.cpp
@@ -121,7 +121,7 @@ static const uint64_t testnet_hard_fork_version_1_till = 624633;
 //------------------------------------------------------------------
 Blockchain::Blockchain(tx_memory_pool& tx_pool) :
   m_db(), m_tx_pool(tx_pool), m_hardfork(NULL), m_timestamps_and_difficulties_height(0), m_current_block_cumul_sz_limit(0), m_is_in_checkpoint_zone(false),
-  m_is_blockchain_storing(false), m_enforce_dns_checkpoints(false), m_max_prepare_blocks_threads(4), m_db_blocks_per_sync(1), m_db_sync_mode(db_async), m_fast_sync(true), m_show_time_stats(false), m_sync_counter(0)
+  m_is_blockchain_storing(false), m_enforce_dns_checkpoints(false), m_max_prepare_blocks_threads(4), m_db_blocks_per_sync(1), m_db_sync_mode(db_async), m_fast_sync(true), m_show_time_stats(false), m_sync_counter(0), m_cancel(false)
 {
   LOG_PRINT_L3("Blockchain::" << __func__);
 }
@@ -3455,6 +3455,8 @@ void Blockchain::block_longhash_worker(const uint64_t height, const std::vector<
   //       the height of the block passed to it
   for (const auto & block : blocks)
   {
+    if (m_cancel)
+       return;
     crypto::hash id = get_block_hash(block);
     crypto::hash pow = get_block_longhash(block, height);
     map.emplace(id, pow);
@@ -3630,6 +3632,9 @@ bool Blockchain::prepare_handle_incoming_blocks(const std::list<block_complete_e
 
       thread_list.clear();
 
+      if (m_cancel)
+         return false;
+
       for (const auto & map : maps)
       {
         m_blocks_longhash_table.insert(map.begin(), map.end());
@@ -3637,6 +3642,9 @@ bool Blockchain::prepare_handle_incoming_blocks(const std::list<block_complete_e
     }
   }
 
+  if (m_cancel)
+    return false;
+
   if (blocks_exist)
   {
     LOG_PRINT_L0("Skipping prepare blocks. Blocks exist.");
@@ -3674,6 +3682,9 @@ bool Blockchain::prepare_handle_incoming_blocks(const std::list<block_complete_e
   // generate sorted tables for all amounts and absolute offsets
   for (const auto &entry : blocks_entry)
   {
+    if (m_cancel)
+      return false;
+
     for (const auto &tx_blob : entry.txs)
     {
       crypto::hash tx_hash = null_hash;
@@ -3782,6 +3793,9 @@ bool Blockchain::prepare_handle_incoming_blocks(const std::list<block_complete_e
   // now generate a table for each tx_prefix and k_image hashes
   for (const auto &entry : blocks_entry)
   {
+    if (m_cancel)
+      return false;
+
     for (const auto &tx_blob : entry.txs)
     {
       crypto::hash tx_hash = null_hash;
@@ -3863,6 +3877,11 @@ std::map<uint64_t, std::tuple<uint64_t, uint64_t, uint64_t>> Blockchain:: get_ou
   return m_db->get_output_histogram(amounts, unlocked, recent_cutoff);
 }
 
+void Blockchain::cancel()
+{
+  m_cancel = true;
+}
+
 #if defined(PER_BLOCK_CHECKPOINT)
 void Blockchain::load_compiled_in_block_hashes()
 {
diff --git a/src/cryptonote_core/blockchain.h b/src/cryptonote_core/blockchain.h
index f9ae9d8aa..9afc22657 100644
--- a/src/cryptonote_core/blockchain.h
+++ b/src/cryptonote_core/blockchain.h
@@ -843,6 +843,9 @@ namespace cryptonote
      */
     void block_longhash_worker(const uint64_t height, const std::vector<block> &blocks,
         std::unordered_map<crypto::hash, crypto::hash> &map) const;
+
+    void cancel();
+
   private:
 
     // TODO: evaluate whether or not each of these typedefs are left over from blockchain_storage
@@ -912,6 +915,8 @@ namespace cryptonote
 
     bool m_testnet;
 
+    std::atomic<bool> m_cancel;
+
     /**
      * @brief collects the keys for all outputs being "spent" as an input
      *
diff --git a/src/cryptonote_core/cryptonote_core.cpp b/src/cryptonote_core/cryptonote_core.cpp
index 84a41cfbf..4da4533f8 100644
--- a/src/cryptonote_core/cryptonote_core.cpp
+++ b/src/cryptonote_core/cryptonote_core.cpp
@@ -123,7 +123,7 @@ namespace cryptonote
   //-----------------------------------------------------------------------------------
   void core::stop()
   {
-    graceful_exit();
+    m_blockchain_storage.cancel();
   }
   //-----------------------------------------------------------------------------------
   void core::init_options(boost::program_options::options_description& desc)