Merge #9289: net: drop boost::thread_group

67ee4ec net: misc header cleanups (Cory Fields)
8b3159e net: make proxy receives interruptible (Cory Fields)
5cb0fce net: remove thread_interrupted catch (Cory Fields)
d3d7056 net: make net processing interruptible (Cory Fields)
0985052 net: make net interruptible (Cory Fields)
799df91 net: add CThreadInterrupt and InterruptibleSleep (Cory Fields)
7325b15 net: a few small cleanups before replacing boost threads (Cory Fields)

11 files changed, 222 insertions, 81 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
index 89b90e6dff..3428d4613d 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -138,6 +138,7 @@ BITCOIN_CORE_H = \
   support/lockedpool.h \
   sync.h \
   threadsafety.h \
+  threadinterrupt.h \
   timedata.h \
   torcontrol.h \
   txdb.h \
@@ -327,6 +328,7 @@ libbitcoin_util_a_SOURCES = \
   rpc/protocol.cpp \
   support/cleanse.cpp \
   sync.cpp \
+  threadinterrupt.cpp \
   util.cpp \
   utilmoneystr.cpp \
   utilstrencodings.cpp \
diff --git a/src/init.cpp b/src/init.cpp
index 52a115b8c8..8110b63119 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -176,6 +176,8 @@ void Interrupt(boost::thread_group& threadGroup)
     InterruptRPC();
     InterruptREST();
     InterruptTorControl();
+    if (g_connman)
+        g_connman->Interrupt();
     threadGroup.interrupt_all();
 }
 
@@ -1572,7 +1574,7 @@ bool AppInitMain(boost::thread_group& threadGroup, CScheduler& scheduler)
     connOptions.nMaxOutboundTimeframe = nMaxOutboundTimeframe;
     connOptions.nMaxOutboundLimit = nMaxOutboundLimit;
 
-    if(!connman.Start(threadGroup, scheduler, strNodeError, connOptions))
+    if (!connman.Start(scheduler, strNodeError, connOptions))
         return InitError(strNodeError);
 
     // ********************************************************* Step 12: finished
diff --git a/src/net.cpp b/src/net.cpp
index 52fd725392..bf2beb7740 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -35,8 +35,6 @@
 #include <miniupnpc/upnperrors.h>
 #endif
 
-#include <boost/filesystem.hpp>
-#include <boost/thread.hpp>
 
 #include <math.h>
 
@@ -1042,7 +1040,7 @@ void CConnman::AcceptConnection(const ListenSocket& hListenSocket) {
 void CConnman::ThreadSocketHandler()
 {
     unsigned int nPrevNodeCount = 0;
-    while (true)
+    while (!interruptNet)
     {
         //
         // Disconnect nodes
@@ -1180,7 +1178,8 @@ void CConnman::ThreadSocketHandler()
 
         int nSelect = select(have_fds ? hSocketMax + 1 : 0,
                              &fdsetRecv, &fdsetSend, &fdsetError, &timeout);
-        boost::this_thread::interruption_point();
+        if (interruptNet)
+            return;
 
         if (nSelect == SOCKET_ERROR)
         {
@@ -1193,7 +1192,8 @@ void CConnman::ThreadSocketHandler()
             }
             FD_ZERO(&fdsetSend);
             FD_ZERO(&fdsetError);
-            MilliSleep(timeout.tv_usec/1000);
+            if (!interruptNet.sleep_for(std::chrono::milliseconds(timeout.tv_usec/1000)))
+                return;
         }
 
         //
@@ -1219,7 +1219,8 @@ void CConnman::ThreadSocketHandler()
         }
         BOOST_FOREACH(CNode* pnode, vNodesCopy)
         {
-            boost::this_thread::interruption_point();
+            if (interruptNet)
+                return;
 
             //
             // Receive
@@ -1241,7 +1242,7 @@ void CConnman::ThreadSocketHandler()
                             if (!pnode->ReceiveMsgBytes(pchBuf, nBytes, notify))
                                 pnode->CloseSocketDisconnect();
                             if(notify)
-                                messageHandlerCondition.notify_one();
+                                condMsgProc.notify_one();
                             pnode->nLastRecv = GetTime();
                             pnode->nRecvBytes += nBytes;
                             RecordBytesRecv(nBytes);
@@ -1469,7 +1470,8 @@ void CConnman::ThreadDNSAddressSeed()
     //  less influence on the network topology, and reduces traffic to the seeds.
     if ((addrman.size() > 0) &&
         (!GetBoolArg("-forcednsseed", DEFAULT_FORCEDNSSEED))) {
-        MilliSleep(11 * 1000);
+        if (!interruptNet.sleep_for(std::chrono::seconds(11)))
+            return;
 
         LOCK(cs_vNodes);
         int nRelevant = 0;
@@ -1580,10 +1582,12 @@ void CConnman::ThreadOpenConnections()
                 OpenNetworkConnection(addr, false, NULL, strAddr.c_str());
                 for (int i = 0; i < 10 && i < nLoop; i++)
                 {
-                    MilliSleep(500);
+                    if (!interruptNet.sleep_for(std::chrono::milliseconds(500)))
+                        return;
                 }
             }
-            MilliSleep(500);
+            if (!interruptNet.sleep_for(std::chrono::milliseconds(500)))
+                return;
         }
     }
 
@@ -1592,14 +1596,16 @@ void CConnman::ThreadOpenConnections()
 
     // Minimum time before next feeler connection (in microseconds).
     int64_t nNextFeeler = PoissonNextSend(nStart*1000*1000, FEELER_INTERVAL);
-    while (true)
+    while (!interruptNet)
     {
         ProcessOneShot();
 
-        MilliSleep(500);
+        if (!interruptNet.sleep_for(std::chrono::milliseconds(500)))
+            return;
 
         CSemaphoreGrant grant(*semOutbound);
-        boost::this_thread::interruption_point();
+        if (interruptNet)
+            return;
 
         // Add seed nodes if DNS seeds are all down (an infrastructure attack?).
         if (addrman.size() == 0 && (GetTime() - nStart > 60)) {
@@ -1657,7 +1663,7 @@ void CConnman::ThreadOpenConnections()
 
         int64_t nANow = GetAdjustedTime();
         int nTries = 0;
-        while (true)
+        while (!interruptNet)
         {
             CAddrInfo addr = addrman.Select(fFeeler);
 
@@ -1700,7 +1706,8 @@ void CConnman::ThreadOpenConnections()
             if (fFeeler) {
                 // Add small amount of random noise before connection to avoid synchronization.
                 int randsleep = GetRandInt(FEELER_SLEEP_WINDOW * 1000);
-                MilliSleep(randsleep);
+                if (!interruptNet.sleep_for(std::chrono::milliseconds(randsleep)))
+                    return;
                 LogPrint("net", "Making feeler connection to %s\n", addrConnect.ToString());
             }
 
@@ -1779,11 +1786,12 @@ void CConnman::ThreadOpenAddedConnections()
                 // OpenNetworkConnection can detect existing connections to that IP/port.
                 CService service(LookupNumeric(info.strAddedNode.c_str(), Params().GetDefaultPort()));
                 OpenNetworkConnection(CAddress(service, NODE_NONE), false, &grant, info.strAddedNode.c_str(), false);
-                MilliSleep(500);
+                if (!interruptNet.sleep_for(std::chrono::milliseconds(500)))
+                    return;
             }
         }
-
-        MilliSleep(120000); // Retry every 2 minutes
+        if (!interruptNet.sleep_for(std::chrono::minutes(2)))
+            return;
     }
 }
 
@@ -1793,7 +1801,9 @@ bool CConnman::OpenNetworkConnection(const CAddress& addrConnect, bool fCountFai
     //
     // Initiate outbound network connection
     //
-    boost::this_thread::interruption_point();
+    if (interruptNet) {
+        return false;
+    }
     if (!fNetworkActive) {
         return false;
     }
@@ -1806,7 +1816,6 @@ bool CConnman::OpenNetworkConnection(const CAddress& addrConnect, bool fCountFai
         return false;
 
     CNode* pnode = ConnectNode(addrConnect, pszDest, fCountFailure);
-    boost::this_thread::interruption_point();
 
     if (!pnode)
         return false;
@@ -1820,13 +1829,9 @@ bool CConnman::OpenNetworkConnection(const CAddress& addrConnect, bool fCountFai
     return true;
 }
 
-
 void CConnman::ThreadMessageHandler()
 {
-    boost::mutex condition_mutex;
-    boost::unique_lock<boost::mutex> lock(condition_mutex);
-
-    while (true)
+    while (!flagInterruptMsgProc)
     {
         std::vector<CNode*> vNodesCopy;
         {
@@ -1849,7 +1854,7 @@ void CConnman::ThreadMessageHandler()
                 TRY_LOCK(pnode->cs_vRecvMsg, lockRecv);
                 if (lockRecv)
                 {
-                    if (!GetNodeSignals().ProcessMessages(pnode, *this))
+                    if (!GetNodeSignals().ProcessMessages(pnode, *this, flagInterruptMsgProc))
                         pnode->CloseSocketDisconnect();
 
                     if (pnode->nSendSize < GetSendBufferSize())
@@ -1861,15 +1866,17 @@ void CConnman::ThreadMessageHandler()
                     }
                 }
             }
-            boost::this_thread::interruption_point();
+            if (flagInterruptMsgProc)
+                return;
 
             // Send messages
             {
                 TRY_LOCK(pnode->cs_vSend, lockSend);
                 if (lockSend)
-                    GetNodeSignals().SendMessages(pnode, *this);
+                    GetNodeSignals().SendMessages(pnode, *this, flagInterruptMsgProc);
             }
-            boost::this_thread::interruption_point();
+            if (flagInterruptMsgProc)
+                return;
         }
 
         {
@@ -1878,8 +1885,10 @@ void CConnman::ThreadMessageHandler()
                 pnode->Release();
         }
 
-        if (fSleep)
-            messageHandlerCondition.timed_wait(lock, boost::posix_time::microsec_clock::universal_time() + boost::posix_time::milliseconds(100));
+        if (fSleep) {
+            std::unique_lock<std::mutex> lock(mutexMsgProc);
+            condMsgProc.wait_until(lock, std::chrono::steady_clock::now() + std::chrono::milliseconds(100));
+        }
     }
 }
 
@@ -2071,6 +2080,7 @@ CConnman::CConnman(uint64_t nSeed0In, uint64_t nSeed1In) : nSeed0(nSeed0In), nSe
     nMaxOutbound = 0;
     nBestHeight = 0;
     clientInterface = NULL;
+    flagInterruptMsgProc = false;
 }
 
 NodeId CConnman::GetNewNodeId()
@@ -2078,7 +2088,7 @@ NodeId CConnman::GetNewNodeId()
     return nLastNodeId.fetch_add(1, std::memory_order_relaxed);
 }
 
-bool CConnman::Start(boost::thread_group& threadGroup, CScheduler& scheduler, std::string& strNodeError, Options connOptions)
+bool CConnman::Start(CScheduler& scheduler, std::string& strNodeError, Options connOptions)
 {
     nTotalBytesRecv = 0;
     nTotalBytesSent = 0;
@@ -2145,24 +2155,27 @@ bool CConnman::Start(boost::thread_group& threadGroup, CScheduler& scheduler, st
     //
     // Start threads
     //
+    InterruptSocks5(false);
+    interruptNet.reset();
+    flagInterruptMsgProc = false;
+
+    // Send and receive from sockets, accept connections
+    threadSocketHandler = std::thread(&TraceThread<std::function<void()> >, "net", std::function<void()>(std::bind(&CConnman::ThreadSocketHandler, this)));
 
     if (!GetBoolArg("-dnsseed", true))
         LogPrintf("DNS seeding disabled\n");
     else
-        threadGroup.create_thread(boost::bind(&TraceThread<boost::function<void()> >, "dnsseed", boost::function<void()>(boost::bind(&CConnman::ThreadDNSAddressSeed, this))));
-
-    // Send and receive from sockets, accept connections
-    threadGroup.create_thread(boost::bind(&TraceThread<boost::function<void()> >, "net", boost::function<void()>(boost::bind(&CConnman::ThreadSocketHandler, this))));
+        threadDNSAddressSeed = std::thread(&TraceThread<std::function<void()> >, "dnsseed", std::function<void()>(std::bind(&CConnman::ThreadDNSAddressSeed, this)));
 
     // Initiate outbound connections from -addnode
-    threadGroup.create_thread(boost::bind(&TraceThread<boost::function<void()> >, "addcon", boost::function<void()>(boost::bind(&CConnman::ThreadOpenAddedConnections, this))));
+    threadOpenAddedConnections = std::thread(&TraceThread<std::function<void()> >, "addcon", std::function<void()>(std::bind(&CConnman::ThreadOpenAddedConnections, this)));
 
     // Initiate outbound connections unless connect=0
     if (!mapMultiArgs.count("-connect") || mapMultiArgs.at("-connect").size() != 1 || mapMultiArgs.at("-connect")[0] != "0")
-        threadGroup.create_thread(boost::bind(&TraceThread<boost::function<void()> >, "opencon", boost::function<void()>(boost::bind(&CConnman::ThreadOpenConnections, this))));
+        threadOpenConnections = std::thread(&TraceThread<std::function<void()> >, "opencon", std::function<void()>(std::bind(&CConnman::ThreadOpenConnections, this)));
 
     // Process messages
-    threadGroup.create_thread(boost::bind(&TraceThread<boost::function<void()> >, "msghand", boost::function<void()>(boost::bind(&CConnman::ThreadMessageHandler, this))));
+    threadMessageHandler = std::thread(&TraceThread<std::function<void()> >, "msghand", std::function<void()>(std::bind(&CConnman::ThreadMessageHandler, this)));
 
     // Dump network addresses
     scheduler.scheduleEvery(boost::bind(&CConnman::DumpData, this), DUMP_ADDRESSES_INTERVAL);
@@ -2185,12 +2198,34 @@ public:
 }
 instance_of_cnetcleanup;
 
-void CConnman::Stop()
+void CConnman::Interrupt()
 {
-    LogPrintf("%s\n",__func__);
+    {
+        std::lock_guard<std::mutex> lock(mutexMsgProc);
+        flagInterruptMsgProc = true;
+    }
+    condMsgProc.notify_all();
+
+    interruptNet();
+    InterruptSocks5(true);
+
     if (semOutbound)
         for (int i=0; i<(nMaxOutbound + nMaxFeeler); i++)
             semOutbound->post();
+}
+
+void CConnman::Stop()
+{
+    if (threadMessageHandler.joinable())
+        threadMessageHandler.join();
+    if (threadOpenConnections.joinable())
+        threadOpenConnections.join();
+    if (threadOpenAddedConnections.joinable())
+        threadOpenAddedConnections.join();
+    if (threadDNSAddressSeed.joinable())
+        threadDNSAddressSeed.join();
+    if (threadSocketHandler.joinable())
+        threadSocketHandler.join();
 
     if (fAddressesInitialized)
     {
@@ -2233,6 +2268,7 @@ void CConnman::DeleteNode(CNode* pnode)
 
 CConnman::~CConnman()
 {
+    Interrupt();
     Stop();
 }
 
diff --git a/src/net.h b/src/net.h
index 1d07864383..6ca402f71d 100644
--- a/src/net.h
+++ b/src/net.h
@@ -19,11 +19,14 @@
 #include "streams.h"
 #include "sync.h"
 #include "uint256.h"
+#include "threadinterrupt.h"
 
 #include <atomic>
 #include <deque>
 #include <stdint.h>
+#include <thread>
 #include <memory>
+#include <condition_variable>
 
 #ifndef WIN32
 #include <arpa/inet.h>
@@ -142,8 +145,9 @@ public:
     };
     CConnman(uint64_t seed0, uint64_t seed1);
     ~CConnman();
-    bool Start(boost::thread_group& threadGroup, CScheduler& scheduler, std::string& strNodeError, Options options);
+    bool Start(CScheduler& scheduler, std::string& strNodeError, Options options);
     void Stop();
+    void Interrupt();
     bool BindListenPort(const CService &bindAddr, std::string& strError, bool fWhitelisted = false);
     bool GetNetworkActive() const { return fNetworkActive; };
     void SetNetworkActive(bool active);
@@ -402,7 +406,6 @@ private:
     std::list<CNode*> vNodesDisconnected;
     mutable CCriticalSection cs_vNodes;
     std::atomic<NodeId> nLastNodeId;
-    boost::condition_variable messageHandlerCondition;
 
     /** Services this instance offers */
     ServiceFlags nLocalServices;
@@ -419,6 +422,18 @@ private:
 
     /** SipHasher seeds for deterministic randomness */
     const uint64_t nSeed0, nSeed1;
+
+    std::condition_variable condMsgProc;
+    std::mutex mutexMsgProc;
+    std::atomic<bool> flagInterruptMsgProc;
+
+    CThreadInterrupt interruptNet;
+
+    std::thread threadDNSAddressSeed;
+    std::thread threadSocketHandler;
+    std::thread threadOpenAddedConnections;
+    std::thread threadOpenConnections;
+    std::thread threadMessageHandler;
 };
 extern std::unique_ptr<CConnman> g_connman;
 void Discover(boost::thread_group& threadGroup);
@@ -445,8 +460,8 @@ struct CombinerAll
 // Signals for message handling
 struct CNodeSignals
 {
-    boost::signals2::signal<bool (CNode*, CConnman&), CombinerAll> ProcessMessages;
-    boost::signals2::signal<bool (CNode*, CConnman&), CombinerAll> SendMessages;
+    boost::signals2::signal<bool (CNode*, CConnman&, std::atomic<bool>&), CombinerAll> ProcessMessages;
+    boost::signals2::signal<bool (CNode*, CConnman&, std::atomic<bool>&), CombinerAll> SendMessages;
     boost::signals2::signal<void (CNode*, CConnman&)> InitializeNode;
     boost::signals2::signal<void (NodeId, bool&)> FinalizeNode;
 };
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index 380decbcb7..e0c12d8530 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -886,7 +886,7 @@ static void RelayAddress(const CAddress& addr, bool fReachable, CConnman& connma
     connman.ForEachNodeThen(std::move(sortfunc), std::move(pushfunc));
 }
 
-void static ProcessGetData(CNode* pfrom, const Consensus::Params& consensusParams, CConnman& connman)
+void static ProcessGetData(CNode* pfrom, const Consensus::Params& consensusParams, CConnman& connman, std::atomic<bool>& interruptMsgProc)
 {
     std::deque<CInv>::iterator it = pfrom->vRecvGetData.begin();
     unsigned int nMaxSendBufferSize = connman.GetSendBufferSize();
@@ -901,7 +901,9 @@ void static ProcessGetData(CNode* pfrom, const Consensus::Params& consensusParam
 
         const CInv &inv = *it;
         {
-            boost::this_thread::interruption_point();
+            if (interruptMsgProc)
+                return;
+
             it++;
 
             if (inv.type == MSG_BLOCK || inv.type == MSG_FILTERED_BLOCK || inv.type == MSG_CMPCT_BLOCK || inv.type == MSG_WITNESS_BLOCK)
@@ -1055,7 +1057,7 @@ uint32_t GetFetchFlags(CNode* pfrom, CBlockIndex* pprev, const Consensus::Params
     return nFetchFlags;
 }
 
-bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv, int64_t nTimeReceived, const CChainParams& chainparams, CConnman& connman)
+bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv, int64_t nTimeReceived, const CChainParams& chainparams, CConnman& connman, std::atomic<bool>& interruptMsgProc)
 {
     unsigned int nMaxSendBufferSize = connman.GetSendBufferSize();
 
@@ -1295,7 +1297,8 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
         int64_t nSince = nNow - 10 * 60;
         BOOST_FOREACH(CAddress& addr, vAddr)
         {
-            boost::this_thread::interruption_point();
+            if (interruptMsgProc)
+                return true;
 
             if ((addr.nServices & REQUIRED_SERVICES) != REQUIRED_SERVICES)
                 continue;
@@ -1377,7 +1380,8 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
         {
             CInv &inv = vInv[nInv];
 
-            boost::this_thread::interruption_point();
+            if (interruptMsgProc)
+                return true;
 
             bool fAlreadyHave = AlreadyHave(inv);
             LogPrint("net", "got inv: %s  %s peer=%d\n", inv.ToString(), fAlreadyHave ? "have" : "new", pfrom->id);
@@ -1439,7 +1443,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
             LogPrint("net", "received getdata for: %s peer=%d\n", vInv[0].ToString(), pfrom->id);
 
         pfrom->vRecvGetData.insert(pfrom->vRecvGetData.end(), vInv.begin(), vInv.end());
-        ProcessGetData(pfrom, chainparams.GetConsensus(), connman);
+        ProcessGetData(pfrom, chainparams.GetConsensus(), connman, interruptMsgProc);
     }
 
 
@@ -1513,7 +1517,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
             inv.type = State(pfrom->GetId())->fWantsCmpctWitness ? MSG_WITNESS_BLOCK : MSG_BLOCK;
             inv.hash = req.blockhash;
             pfrom->vRecvGetData.push_back(inv);
-            ProcessGetData(pfrom, chainparams.GetConsensus(), connman);
+            ProcessGetData(pfrom, chainparams.GetConsensus(), connman, interruptMsgProc);
             return true;
         }
 
@@ -1925,10 +1929,10 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
         } // cs_main
 
         if (fProcessBLOCKTXN)
-            return ProcessMessage(pfrom, NetMsgType::BLOCKTXN, blockTxnMsg, nTimeReceived, chainparams, connman);
+            return ProcessMessage(pfrom, NetMsgType::BLOCKTXN, blockTxnMsg, nTimeReceived, chainparams, connman, interruptMsgProc);
 
         if (fRevertToHeaderProcessing)
-            return ProcessMessage(pfrom, NetMsgType::HEADERS, vHeadersMsg, nTimeReceived, chainparams, connman);
+            return ProcessMessage(pfrom, NetMsgType::HEADERS, vHeadersMsg, nTimeReceived, chainparams, connman, interruptMsgProc);
 
         if (fBlockReconstructed) {
             // If we got here, we were able to optimistically reconstruct a
@@ -2441,7 +2445,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
 }
 
 // requires LOCK(cs_vRecvMsg)
-bool ProcessMessages(CNode* pfrom, CConnman& connman)
+bool ProcessMessages(CNode* pfrom, CConnman& connman, std::atomic<bool>& interruptMsgProc)
 {
     const CChainParams& chainparams = Params();
     unsigned int nMaxSendBufferSize = connman.GetSendBufferSize();
@@ -2459,7 +2463,7 @@ bool ProcessMessages(CNode* pfrom, CConnman& connman)
     bool fOk = true;
 
     if (!pfrom->vRecvGetData.empty())
-        ProcessGetData(pfrom, chainparams.GetConsensus(), connman);
+        ProcessGetData(pfrom, chainparams.GetConsensus(), connman, interruptMsgProc);
 
     // this maintains the order of responses
     if (!pfrom->vRecvGetData.empty()) return fOk;
@@ -2520,8 +2524,9 @@ bool ProcessMessages(CNode* pfrom, CConnman& connman)
         bool fRet = false;
         try
         {
-            fRet = ProcessMessage(pfrom, strCommand, vRecv, msg.nTime, chainparams, connman);
-            boost::this_thread::interruption_point();
+            fRet = ProcessMessage(pfrom, strCommand, vRecv, msg.nTime, chainparams, connman, interruptMsgProc);
+            if (interruptMsgProc)
+                return true;
         }
         catch (const std::ios_base::failure& e)
         {
@@ -2546,9 +2551,6 @@ bool ProcessMessages(CNode* pfrom, CConnman& connman)
                 PrintExceptionContinue(&e, "ProcessMessages()");
             }
         }
-        catch (const boost::thread_interrupted&) {
-            throw;
-        }
         catch (const std::exception& e) {
             PrintExceptionContinue(&e, "ProcessMessages()");
         } catch (...) {
@@ -2585,7 +2587,7 @@ public:
     }
 };
 
-bool SendMessages(CNode* pto, CConnman& connman)
+bool SendMessages(CNode* pto, CConnman& connman, std::atomic<bool>& interruptMsgProc)
 {
     const Consensus::Params& consensusParams = Params().GetConsensus();
     {
diff --git a/src/net_processing.h b/src/net_processing.h
index dc250ebab6..230d805bd4 100644
--- a/src/net_processing.h
+++ b/src/net_processing.h
@@ -39,13 +39,14 @@ bool GetNodeStateStats(NodeId nodeid, CNodeStateStats &stats);
 void Misbehaving(NodeId nodeid, int howmuch);
 
 /** Process protocol messages received from a given node */
-bool ProcessMessages(CNode* pfrom, CConnman& connman);
+bool ProcessMessages(CNode* pfrom, CConnman& connman, std::atomic<bool>& interrupt);
 /**
  * Send queued protocol messages to be sent to a give node.
  *
  * @param[in]   pto             The node which we are sending messages to.
  * @param[in]   connman         The connection manager for that node.
+ * @param[in]   interrupt       Interrupt condition for processing threads
  */
-bool SendMessages(CNode* pto, CConnman& connman);
+bool SendMessages(CNode* pto, CConnman& connman, std::atomic<bool>& interrupt);
 
 #endif // BITCOIN_NET_PROCESSING_H
diff --git a/src/netbase.cpp b/src/netbase.cpp
index 21aa645de9..8fd2a8efd2 100644
--- a/src/netbase.cpp
+++ b/src/netbase.cpp
@@ -16,20 +16,14 @@
 #include "util.h"
 #include "utilstrencodings.h"
 
-#ifdef HAVE_GETADDRINFO_A
-#include <netdb.h>
-#endif
+#include <atomic>
 
 #ifndef WIN32
-#if HAVE_INET_PTON
-#include <arpa/inet.h>
-#endif
 #include <fcntl.h>
 #endif
 
 #include <boost/algorithm/string/case_conv.hpp> // for to_lower()
 #include <boost/algorithm/string/predicate.hpp> // for startswith() and endswith()
-#include <boost/thread.hpp>
 
 #if !defined(HAVE_MSG_NOSIGNAL) && !defined(MSG_NOSIGNAL)
 #define MSG_NOSIGNAL 0
@@ -44,6 +38,7 @@ bool fNameLookup = DEFAULT_NAME_LOOKUP;
 
 // Need ample time for negotiation for very slow proxies such as Tor (milliseconds)
 static const int SOCKS5_RECV_TIMEOUT = 20 * 1000;
+static std::atomic<bool> interruptSocks5Recv(false);
 
 enum Network ParseNetwork(std::string net) {
     boost::to_lower(net);
@@ -206,7 +201,7 @@ struct timeval MillisToTimeval(int64_t nTimeout)
 /**
  * Read bytes from socket. This will either read the full number of bytes requested
  * or return False on error or timeout.
- * This function can be interrupted by boost thread interrupt.
+ * This function can be interrupted by calling InterruptSocks5()
  *
  * @param data Buffer to receive into
  * @param len  Length of data to receive
@@ -246,7 +241,8 @@ bool static InterruptibleRecv(char* data, size_t len, int timeout, SOCKET& hSock
                 return false;
             }
         }
-        boost::this_thread::interruption_point();
+        if (interruptSocks5Recv)
+            return false;
         curTime = GetTimeMillis();
     }
     return len == 0;
@@ -715,3 +711,8 @@ bool SetSocketNonBlocking(SOCKET& hSocket, bool fNonBlocking)
 
     return true;
 }
+
+void InterruptSocks5(bool interrupt)
+{
+    interruptSocks5Recv = interrupt;
+}
diff --git a/src/netbase.h b/src/netbase.h
index 0337d0d54b..dd33b6e47e 100644
--- a/src/netbase.h
+++ b/src/netbase.h
@@ -63,5 +63,6 @@ bool SetSocketNonBlocking(SOCKET& hSocket, bool fNonBlocking);
  * Convert milliseconds to a struct timeval for e.g. select.
  */
 struct timeval MillisToTimeval(int64_t nTimeout);
+void InterruptSocks5(bool interrupt);
 
 #endif // BITCOIN_NETBASE_H
diff --git a/src/test/DoS_tests.cpp b/src/test/DoS_tests.cpp
index c7c3646b03..f02579878a 100644
--- a/src/test/DoS_tests.cpp
+++ b/src/test/DoS_tests.cpp
@@ -47,6 +47,8 @@ BOOST_FIXTURE_TEST_SUITE(DoS_tests, TestingSetup)
 
 BOOST_AUTO_TEST_CASE(DoS_banning)
 {
+    std::atomic<bool> interruptDummy(false);
+
     connman->ClearBanned();
     CAddress addr1(ip(0xa0b0c001), NODE_NONE);
     CNode dummyNode1(id++, NODE_NETWORK, 0, INVALID_SOCKET, addr1, 0, 0, "", true);
@@ -54,7 +56,7 @@ BOOST_AUTO_TEST_CASE(DoS_banning)
     GetNodeSignals().InitializeNode(&dummyNode1, *connman);
     dummyNode1.nVersion = 1;
     Misbehaving(dummyNode1.GetId(), 100); // Should get banned
-    SendMessages(&dummyNode1, *connman);
+    SendMessages(&dummyNode1, *connman, interruptDummy);
     BOOST_CHECK(connman->IsBanned(addr1));
     BOOST_CHECK(!connman->IsBanned(ip(0xa0b0c001|0x0000ff00))); // Different IP, not banned
 
@@ -64,16 +66,18 @@ BOOST_AUTO_TEST_CASE(DoS_banning)
     GetNodeSignals().InitializeNode(&dummyNode2, *connman);
     dummyNode2.nVersion = 1;
     Misbehaving(dummyNode2.GetId(), 50);
-    SendMessages(&dummyNode2, *connman);
+    SendMessages(&dummyNode2, *connman, interruptDummy);
     BOOST_CHECK(!connman->IsBanned(addr2)); // 2 not banned yet...
     BOOST_CHECK(connman->IsBanned(addr1));  // ... but 1 still should be
     Misbehaving(dummyNode2.GetId(), 50);
-    SendMessages(&dummyNode2, *connman);
+    SendMessages(&dummyNode2, *connman, interruptDummy);
     BOOST_CHECK(connman->IsBanned(addr2));
 }
 
 BOOST_AUTO_TEST_CASE(DoS_banscore)
 {
+    std::atomic<bool> interruptDummy(false);
+
     connman->ClearBanned();
     ForceSetArg("-banscore", "111"); // because 11 is my favorite number
     CAddress addr1(ip(0xa0b0c001), NODE_NONE);
@@ -82,19 +86,21 @@ BOOST_AUTO_TEST_CASE(DoS_banscore)
     GetNodeSignals().InitializeNode(&dummyNode1, *connman);
     dummyNode1.nVersion = 1;
     Misbehaving(dummyNode1.GetId(), 100);
-    SendMessages(&dummyNode1, *connman);
+    SendMessages(&dummyNode1, *connman, interruptDummy);
     BOOST_CHECK(!connman->IsBanned(addr1));
     Misbehaving(dummyNode1.GetId(), 10);
-    SendMessages(&dummyNode1, *connman);
+    SendMessages(&dummyNode1, *connman, interruptDummy);
     BOOST_CHECK(!connman->IsBanned(addr1));
     Misbehaving(dummyNode1.GetId(), 1);
-    SendMessages(&dummyNode1, *connman);
+    SendMessages(&dummyNode1, *connman, interruptDummy);
     BOOST_CHECK(connman->IsBanned(addr1));
     ForceSetArg("-banscore", std::to_string(DEFAULT_BANSCORE_THRESHOLD));
 }
 
 BOOST_AUTO_TEST_CASE(DoS_bantime)
 {
+    std::atomic<bool> interruptDummy(false);
+
     connman->ClearBanned();
     int64_t nStartTime = GetTime();
     SetMockTime(nStartTime); // Overrides future calls to GetTime()
@@ -106,7 +112,7 @@ BOOST_AUTO_TEST_CASE(DoS_bantime)
     dummyNode.nVersion = 1;
 
     Misbehaving(dummyNode.GetId(), 100);
-    SendMessages(&dummyNode, *connman);
+    SendMessages(&dummyNode, *connman, interruptDummy);
     BOOST_CHECK(connman->IsBanned(addr));
 
     SetMockTime(nStartTime+60*60);
diff --git a/src/threadinterrupt.cpp b/src/threadinterrupt.cpp
new file mode 100644
index 0000000000..9d691079ed
--- /dev/null
+++ b/src/threadinterrupt.cpp
@@ -0,0 +1,41 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2016 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include "threadinterrupt.h"
+
+CThreadInterrupt::operator bool() const
+{
+    return flag.load(std::memory_order_acquire);
+}
+
+void CThreadInterrupt::reset()
+{
+    flag.store(false, std::memory_order_release);
+}
+
+void CThreadInterrupt::operator()()
+{
+    {
+        std::unique_lock<std::mutex> lock(mut);
+        flag.store(true, std::memory_order_release);
+    }
+    cond.notify_all();
+}
+
+bool CThreadInterrupt::sleep_for(std::chrono::milliseconds rel_time)
+{
+    std::unique_lock<std::mutex> lock(mut);
+    return !cond.wait_for(lock, rel_time, [this]() { return flag.load(std::memory_order_acquire); });
+}
+
+bool CThreadInterrupt::sleep_for(std::chrono::seconds rel_time)
+{
+    return sleep_for(std::chrono::duration_cast<std::chrono::milliseconds>(rel_time));
+}
+
+bool CThreadInterrupt::sleep_for(std::chrono::minutes rel_time)
+{
+    return sleep_for(std::chrono::duration_cast<std::chrono::milliseconds>(rel_time));
+}
diff --git a/src/threadinterrupt.h b/src/threadinterrupt.h
new file mode 100644
index 0000000000..54e3102808
--- /dev/null
+++ b/src/threadinterrupt.h
@@ -0,0 +1,34 @@
+// Copyright (c) 2016 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_THREADINTERRUPT_H
+#define BITCOIN_THREADINTERRUPT_H
+
+#include <atomic>
+#include <chrono>
+#include <condition_variable>
+#include <mutex>
+
+/*
+    A helper class for interruptible sleeps. Calling operator() will interrupt
+    any current sleep, and after that point operator bool() will return true
+    until reset.
+*/
+class CThreadInterrupt
+{
+public:
+    explicit operator bool() const;
+    void operator()();
+    void reset();
+    bool sleep_for(std::chrono::milliseconds rel_time);
+    bool sleep_for(std::chrono::seconds rel_time);
+    bool sleep_for(std::chrono::minutes rel_time);
+
+private:
+    std::condition_variable cond;
+    std::mutex mut;
+    std::atomic<bool> flag;
+};
+
+#endif //BITCOIN_THREADINTERRUPT_H