From 0d699fc821048ab9316b0004e6552c8f1dc5e5f4 Mon Sep 17 00:00:00 2001
From: Jonas Schnelli <dev@jonasschnelli.ch>
Date: Mon, 26 Oct 2015 14:55:17 +0100
Subject: [PATCH] fix locking issue with new mempool limiting

Current master crashes on OSX with an exception: "boost: mutex lock failed in pthread_mutex_lock: Invalid argument"
---
 src/txmempool.cpp | 11 ++++++++---
 src/txmempool.h   |  1 +
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/src/txmempool.cpp b/src/txmempool.cpp
index bb148005cd274..efa5c8f7a3eb2 100644
--- a/src/txmempool.cpp
+++ b/src/txmempool.cpp
@@ -309,7 +309,7 @@ void CTxMemPoolEntry::UpdateState(int64_t modifySize, CAmount modifyFee, int64_t
 CTxMemPool::CTxMemPool(const CFeeRate& _minReasonableRelayFee) :
     nTransactionsUpdated(0)
 {
-    clear();
+    _clear(); //lock free clear
 
     // Sanity checks off by default for performance, because otherwise
     // accepting transactions becomes O(N^2) where N is the number
@@ -546,9 +546,8 @@ void CTxMemPool::removeForBlock(const std::vector<CTransaction>& vtx, unsigned i
     blockSinceLastRollingFeeBump = true;
 }
 
-void CTxMemPool::clear()
+void CTxMemPool::_clear()
 {
-    LOCK(cs);
     mapLinks.clear();
     mapTx.clear();
     mapNextTx.clear();
@@ -560,6 +559,12 @@ void CTxMemPool::clear()
     ++nTransactionsUpdated;
 }
 
+void CTxMemPool::clear()
+{
+    LOCK(cs);
+    _clear();
+}
+
 void CTxMemPool::check(const CCoinsViewCache *pcoins) const
 {
     if (!fSanityCheck)
diff --git a/src/txmempool.h b/src/txmempool.h
index d44995eefe737..dedc7ba72c567 100644
--- a/src/txmempool.h
+++ b/src/txmempool.h
@@ -375,6 +375,7 @@ class CTxMemPool
     void removeForBlock(const std::vector<CTransaction>& vtx, unsigned int nBlockHeight,
                         std::list<CTransaction>& conflicts, bool fCurrentEstimate = true);
     void clear();
+    void _clear(); //lock free
     void queryHashes(std::vector<uint256>& vtxid);
     void pruneSpent(const uint256& hash, CCoins &coins);
     unsigned int GetTransactionsUpdated() const;