Merge #12980: Allow quicker shutdowns during LoadBlockIndex()

af5fa82 Allow quicker shutdowns during LoadBlockIndex() (Jonas Schnelli)

Pull request description:

ACKs for commit af5fa8:
  promag:
    utACK af5fa82.
  practicalswift:
    utACK af5fa82

Tree-SHA512: 1c64dcc5d8a9d3411553257cd5a598dcd29be981660e5bca9283c1d957dc56798abcf41d9969cd573088137597a23e48e62a8c476c463d3f176b86a10048f47b

Author: jonasschnelli

src/init.cpp

@@ -1522,6 +1522,7 @@ bool AppInitMain(InitInterfaces& interfaces)
                 // Note that it also sets fReindex based on the disk flag!
                 // From here on out fReindex and fReset mean something different!
                 if (!LoadBlockIndex(chainparams)) {
+                    if (ShutdownRequested()) break;
                     strLoadError = _("Error loading block database");
                     break;
                 }

src/txdb.cpp

@@ -255,6 +255,7 @@ bool CBlockTreeDB::LoadBlockIndexGuts(const Consensus::Params& consensusParams,
     // Load mapBlockIndex
     while (pcursor->Valid()) {
         boost::this_thread::interruption_point();
+        if (ShutdownRequested()) return false;
         std::pair<char, uint256> key;
         if (pcursor->GetKey(key) && key.first == DB_BLOCK_INDEX) {
             CDiskBlockIndex diskindex;

src/validation.cpp

@@ -3861,6 +3861,7 @@ bool CChainState::LoadBlockIndex(const Consensus::Params& consensus_params, CBlo
     sort(vSortedByHeight.begin(), vSortedByHeight.end());
     for (const std::pair<int, CBlockIndex*>& item : vSortedByHeight)
     {
+        if (ShutdownRequested()) return false;
         CBlockIndex* pindex = item.second;
         pindex->nChainWork = (pindex->pprev ? pindex->pprev->nChainWork : 0) + GetBlockProof(*pindex);
         pindex->nTimeMax = (pindex->pprev ? std::max(pindex->pprev->nTimeMax, pindex->nTime) : pindex->nTime);