Split CNode::cs_vSend: message processing and message sending

cs_vSend is used for two purposes - to lock the datastructures used
to queue messages to place on the wire and to only call
SendMessages once at a time per-node. I believe SendMessages used
to access some of the vSendMsg stuff, but it doesn't anymore, so
these locks do not need to be on the same mutex, and also make
deadlocking much more likely.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/net.h b/src/net.h
index 2baf82702c..aef3ef9a7d 100644
--- a/src/net.h
+++ b/src/net.h
@@ -618,6 +618,8 @@ public:
     std::list<CNetMessage> vProcessMsg;
     size_t nProcessQueueSize;
 
+    CCriticalSection cs_sendProcessing;
+
     std::deque<CInv> vRecvGetData;
     uint64_t nRecvBytes;
     std::atomic<int> nRecvVersion;