From 2bc6cecebba52e32db43a0b2d9b519ac4a48c479 Mon Sep 17 00:00:00 2001
From: Matt Corallo <matt@bluematt.me>
Date: Mon, 21 Nov 2011 12:25:00 -0500
Subject: [PATCH] Move DNS Seed lookup to a new thread.

---
 src/init.cpp |    5 -----
 src/net.cpp  |   39 ++++++++++++++++++++++++++++++++++++++-
 src/net.h    |    1 -
 3 files changed, 38 insertions(+), 7 deletions(-)

diff --git a/src/init.cpp b/src/init.cpp
index a6d0ab5..ee31ff9 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -476,11 +476,6 @@ bool AppInit2(int argc, char* argv[])
         }
     }
 
-    if (GetBoolArg("-nodnsseed"))
-        printf("DNS seeding disabled\n");
-    else
-        DNSAddressSeed();
-
     if (mapArgs.count("-paytxfee"))
     {
         if (!ParseMoney(mapArgs["-paytxfee"], nTransactionFee))
diff --git a/src/net.cpp b/src/net.cpp
index 0c28eaa..199fb40 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -32,6 +32,7 @@ void ThreadOpenConnections2(void* parg);
 #ifdef USE_UPNP
 void ThreadMapPort2(void* parg);
 #endif
+void ThreadDNSAddressSeed2(void* parg);
 bool OpenNetworkConnection(const CAddress& addrConnect);
 
 
@@ -1213,8 +1214,28 @@ static const char *strDNSSeed[] = {
     "dnsseed.bluematt.me",
 };
 
-void DNSAddressSeed()
+void ThreadDNSAddressSeed(void* parg)
 {
+    IMPLEMENT_RANDOMIZE_STACK(ThreadDNSAddressSeed(parg));
+    try
+    {
+        vnThreadsRunning[6]++;
+        ThreadDNSAddressSeed2(parg);
+        vnThreadsRunning[6]--;
+    }
+    catch (std::exception& e) {
+        vnThreadsRunning[6]--;
+        PrintException(&e, "ThreadDNSAddressSeed()");
+    } catch (...) {
+        vnThreadsRunning[6]--;
+        throw; // support pthread_cancel()
+    }
+    printf("ThreadDNSAddressSeed exiting\n");
+}
+
+void ThreadDNSAddressSeed2(void* parg)
+{
+    printf("ThreadDNSAddressSeed started\n");
     int found = 0;
 
     if (!fTestNet)
@@ -1247,6 +1268,15 @@ void DNSAddressSeed()
 
 
 
+
+
+
+
+
+
+
+
+
 unsigned int pnSeed[] =
 {
     0x6884ac63, 0x3ffecead, 0x2919b953, 0x0942fe50, 0x7a1d922e, 0xcdd6734a, 0x953a5bb6, 0x2c46922e,
@@ -1757,6 +1787,12 @@ void StartNode(void* parg)
     // Start threads
     //
 
+    if (GetBoolArg("-nodnsseed"))
+        printf("DNS seeding disabled\n");
+    else
+        if (!CreateThread(ThreadDNSAddressSeed, NULL))
+            printf("Error: CreateThread(ThreadDNSAddressSeed) failed\n");
+
     // Map ports with UPnP
     if (fHaveUPnP)
         MapPort(fUseUPnP);
@@ -1803,6 +1839,7 @@ bool StopNode()
     if (vnThreadsRunning[3] > 0) printf("ThreadBitcoinMiner still running\n");
     if (vnThreadsRunning[4] > 0) printf("ThreadRPCServer still running\n");
     if (fHaveUPnP && vnThreadsRunning[5] > 0) printf("ThreadMapPort still running\n");
+    if (vnThreadsRunning[6] > 0) printf("ThreadDNSAddressSeed still running\n");
     while (vnThreadsRunning[2] > 0 || vnThreadsRunning[4] > 0)
         Sleep(20);
     Sleep(50);
diff --git a/src/net.h b/src/net.h
index d847268..03da382 100644
--- a/src/net.h
+++ b/src/net.h
@@ -40,7 +40,6 @@ CNode* ConnectNode(CAddress addrConnect, int64 nTimeout=0);
 void AbandonRequests(void (*fn)(void*, CDataStream&), void* param1);
 bool AnySubscribed(unsigned int nChannel);
 void MapPort(bool fMapPort);
-void DNSAddressSeed();
 bool BindListenPort(std::string& strError=REF(std::string()));
 void StartNode(void* parg);
 bool StopNode();
-- 
1.7.1