From 6cc4a62c0e696dcb9d90ba0504f688e4f644a10f Mon Sep 17 00:00:00 2001
From: Gavin Andresen <gavinandresen@gmail.com>
Date: Fri, 26 Aug 2011 14:37:23 -0400
Subject: Fix rpc-hanging deadlocks

Collapsed multiple wallet mutexes to a single cs_wallet, to avoid deadlocks with wallet methods that acquired locks in different order.
Also change master RPC call handler to acquire cs_main and cs_wallet locks before executing RPC calls; requiring each RPC call to acquire the right set of locks in the right order was too error-prone.
---
 src/wallet.h | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

(limited to 'src/wallet.h')

diff --git a/src/wallet.h b/src/wallet.h
index 499f2a63ac..032284dd3a 100644
--- a/src/wallet.h
+++ b/src/wallet.h
@@ -20,14 +20,14 @@ private:
     bool SelectCoins(int64 nTargetValue, std::set<std::pair<const CWalletTx*,unsigned int> >& setCoinsRet, int64& nValueRet) const;
 
     CWalletDB *pwalletdbEncryption;
-    CCriticalSection cs_pwalletdbEncryption;
 
 public:
+    mutable CCriticalSection cs_wallet;
+
     bool fFileBacked;
     std::string strWalletFile;
 
     std::set<int64> setKeyPool;
-    CCriticalSection cs_setKeyPool;
 
     typedef std::map<unsigned int, CMasterKey> MasterKeyMap;
     MasterKeyMap mapMasterKeys;
@@ -47,15 +47,12 @@ public:
         pwalletdbEncryption = NULL;
     }
 
-    mutable CCriticalSection cs_mapWallet;
     std::map<uint256, CWalletTx> mapWallet;
     std::vector<uint256> vWalletUpdated;
 
     std::map<uint256, int> mapRequestCount;
-    mutable CCriticalSection cs_mapRequestCount;
 
     std::map<CBitcoinAddress, std::string> mapAddressBook;
-    mutable CCriticalSection cs_mapAddressBook;
 
     std::vector<unsigned char> vchDefaultKey;
 
@@ -107,7 +104,7 @@ public:
     {
         CBitcoinAddress address;
         if (ExtractAddress(txout.scriptPubKey, this, address))
-            CRITICAL_BLOCK(cs_mapAddressBook)
+            CRITICAL_BLOCK(cs_wallet)
                 if (!mapAddressBook.count(address))
                     return true;
         return false;
@@ -171,15 +168,13 @@ public:
     int LoadWallet(bool& fFirstRunRet);
 //    bool BackupWallet(const std::string& strDest);
 
-    // requires cs_mapAddressBook lock
     bool SetAddressBookName(const CBitcoinAddress& address, const std::string& strName);
 
-    // requires cs_mapAddressBook lock
     bool DelAddressBookName(const CBitcoinAddress& address);
 
     void UpdatedTransaction(const uint256 &hashTx)
     {
-        CRITICAL_BLOCK(cs_mapWallet)
+        CRITICAL_BLOCK(cs_wallet)
             vWalletUpdated.push_back(hashTx);
     }
 
@@ -187,7 +182,7 @@ public:
 
     void Inventory(const uint256 &hash)
     {
-        CRITICAL_BLOCK(cs_mapRequestCount)
+        CRITICAL_BLOCK(cs_wallet)
         {
             std::map<uint256, int>::iterator mi = mapRequestCount.find(hash);
             if (mi != mapRequestCount.end())
-- 
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