[wallet] Make CWallet::ListCoins atomic

Author: promag

src/wallet/test/wallet_tests.cpp

@@ -676,18 +676,24 @@ BOOST_FIXTURE_TEST_CASE(ListCoins, ListCoinsTestingSetup)
     BOOST_CHECK_EQUAL(list.begin()->second.size(), 2);
 
     // Lock both coins. Confirm number of available coins drops to 0.
-    std::vector<COutput> available;
-    wallet->AvailableCoins(available);
-    BOOST_CHECK_EQUAL(available.size(), 2);
+    {
+        LOCK2(cs_main, wallet->cs_wallet);
+        std::vector<COutput> available;
+        wallet->AvailableCoins(available);
+        BOOST_CHECK_EQUAL(available.size(), 2);
+    }
     for (const auto& group : list) {
         for (const auto& coin : group.second) {
             LOCK(wallet->cs_wallet);
             wallet->LockCoin(COutPoint(coin.tx->GetHash(), coin.i));
         }
     }
-    wallet->AvailableCoins(available);
-    BOOST_CHECK_EQUAL(available.size(), 0);
-
+    {
+        LOCK2(cs_main, wallet->cs_wallet);
+        std::vector<COutput> available;
+        wallet->AvailableCoins(available);
+        BOOST_CHECK_EQUAL(available.size(), 0);
+    }
     // Confirm ListCoins still returns same result as before, despite coins
     // being locked.
     list = wallet->ListCoins();

src/wallet/wallet.cpp

@@ -2198,11 +2198,12 @@ CAmount CWallet::GetAvailableBalance(const CCoinControl* coinControl) const
 
 void CWallet::AvailableCoins(std::vector<COutput> &vCoins, bool fOnlySafe, const CCoinControl *coinControl, const CAmount &nMinimumAmount, const CAmount &nMaximumAmount, const CAmount &nMinimumSumAmount, const uint64_t nMaximumCount, const int nMinDepth, const int nMaxDepth) const
 {
+    AssertLockHeld(cs_main);
+    AssertLockHeld(cs_wallet);
+
     vCoins.clear();
 
     {
-        LOCK2(cs_main, cs_wallet);
-
         CAmount nTotal = 0;
 
         for (const auto& entry : mapWallet)
@@ -2320,11 +2321,11 @@ std::map<CTxDestination, std::vector<COutput>> CWallet::ListCoins() const
     // avoid adding some extra complexity to the Qt code.
 
     std::map<CTxDestination, std::vector<COutput>> result;
-
     std::vector<COutput> availableCoins;
-    AvailableCoins(availableCoins);
 
     LOCK2(cs_main, cs_wallet);
+    AvailableCoins(availableCoins);
+
     for (auto& coin : availableCoins) {
         CTxDestination address;
         if (coin.fSpendable &&