Merge #12381: Remove more boost threads

004f999 boost: drop boost threads for [alert|block|wallet]notify (Cory Fields)
0827267 boost: drop boost threads from torcontrol (Cory Fields)
ba91724 boost: remove useless threadGroup parameter from Discover (Cory Fields)
f26866b boost: drop boost threads for upnp (Cory Fields)

Pull request description:

  This doesn't completely get rid of boost::thread, but this batch should be easy to review, and leaves us with only threadGroup (scheduler + scriptcheck) remaining.

  Note to reviewers: The upnp diff changes a bunch of whitespace, it's much more clear with 'git diff -w'

Tree-SHA512: 5a356798d0785f93ed143d1f0afafe890bc82f0d470bc969473da2d2aa78bcb9b096f7ba11b92564d546fb447d4bd0d347e7842994ea0170aafd53fda7e0a66e

8 files changed, 74 insertions, 58 deletions

diff --git a/src/init.cpp b/src/init.cpp
index 4ff875f9aa..b28baba779 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -165,6 +165,7 @@ void Interrupt()
     InterruptRPC();
     InterruptREST();
     InterruptTorControl();
+    InterruptMapPort();
     if (g_connman)
         g_connman->Interrupt();
 }
@@ -191,7 +192,7 @@ void Shutdown()
 #ifdef ENABLE_WALLET
     FlushWallets();
 #endif
-    MapPort(false);
+    StopMapPort();
 
     // Because these depend on each-other, we make sure that neither can be
     // using the other before destroying them.
@@ -545,7 +546,8 @@ static void BlockNotifyCallback(bool initialSync, const CBlockIndex *pBlockIndex
     std::string strCmd = gArgs.GetArg("-blocknotify", "");
     if (!strCmd.empty()) {
         boost::replace_all(strCmd, "%s", pBlockIndex->GetBlockHash().GetHex());
-        boost::thread t(runCommand, strCmd); // thread runs free
+        std::thread t(runCommand, strCmd);
+        t.detach(); // thread runs free
     }
 }
 
@@ -1674,12 +1676,14 @@ bool AppInitMain()
     LogPrintf("nBestHeight = %d\n", chain_active_height);
 
     if (gArgs.GetBoolArg("-listenonion", DEFAULT_LISTEN_ONION))
-        StartTorControl(threadGroup, scheduler);
+        StartTorControl();
 
-    Discover(threadGroup);
+    Discover();
 
     // Map ports with UPnP
-    MapPort(gArgs.GetBoolArg("-upnp", DEFAULT_UPNP));
+    if (gArgs.GetBoolArg("-upnp", DEFAULT_UPNP)) {
+        StartMapPort();
+    }
 
     CConnman::Options connOptions;
     connOptions.nLocalServices = nLocalServices;
diff --git a/src/net.cpp b/src/net.cpp
index 03ed7e7fc1..201914685c 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -1459,6 +1459,8 @@ void CConnman::WakeMessageHandler()
 
 
 #ifdef USE_UPNP
+static CThreadInterrupt g_upnp_interrupt;
+static std::thread g_upnp_thread;
 void ThreadMapPort()
 {
     std::string port = strprintf("%u", GetListenPort());
@@ -1509,35 +1511,29 @@ void ThreadMapPort()
 
         std::string strDesc = "Bitcoin " + FormatFullVersion();
 
-        try {
-            while (true) {
+        do {
 #ifndef UPNPDISCOVER_SUCCESS
-                /* miniupnpc 1.5 */
-                r = UPNP_AddPortMapping(urls.controlURL, data.first.servicetype,
-                                    port.c_str(), port.c_str(), lanaddr, strDesc.c_str(), "TCP", 0);
+            /* miniupnpc 1.5 */
+            r = UPNP_AddPortMapping(urls.controlURL, data.first.servicetype,
+                                port.c_str(), port.c_str(), lanaddr, strDesc.c_str(), "TCP", 0);
 #else
-                /* miniupnpc 1.6 */
-                r = UPNP_AddPortMapping(urls.controlURL, data.first.servicetype,
-                                    port.c_str(), port.c_str(), lanaddr, strDesc.c_str(), "TCP", 0, "0");
+            /* miniupnpc 1.6 */
+            r = UPNP_AddPortMapping(urls.controlURL, data.first.servicetype,
+                                port.c_str(), port.c_str(), lanaddr, strDesc.c_str(), "TCP", 0, "0");
 #endif
 
-                if(r!=UPNPCOMMAND_SUCCESS)
-                    LogPrintf("AddPortMapping(%s, %s, %s) failed with code %d (%s)\n",
-                        port, port, lanaddr, r, strupnperror(r));
-                else
-                    LogPrintf("UPnP Port Mapping successful.\n");
-
-                MilliSleep(20*60*1000); // Refresh every 20 minutes
-            }
-        }
-        catch (const boost::thread_interrupted&)
-        {
-            r = UPNP_DeletePortMapping(urls.controlURL, data.first.servicetype, port.c_str(), "TCP", 0);
-            LogPrintf("UPNP_DeletePortMapping() returned: %d\n", r);
-            freeUPNPDevlist(devlist); devlist = nullptr;
-            FreeUPNPUrls(&urls);
-            throw;
+            if(r!=UPNPCOMMAND_SUCCESS)
+                LogPrintf("AddPortMapping(%s, %s, %s) failed with code %d (%s)\n",
+                    port, port, lanaddr, r, strupnperror(r));
+            else
+                LogPrintf("UPnP Port Mapping successful.\n");
         }
+        while(g_upnp_interrupt.sleep_for(std::chrono::minutes(20)));
+
+        r = UPNP_DeletePortMapping(urls.controlURL, data.first.servicetype, port.c_str(), "TCP", 0);
+        LogPrintf("UPNP_DeletePortMapping() returned: %d\n", r);
+        freeUPNPDevlist(devlist); devlist = nullptr;
+        FreeUPNPUrls(&urls);
     } else {
         LogPrintf("No valid UPnP IGDs found\n");
         freeUPNPDevlist(devlist); devlist = nullptr;
@@ -1546,27 +1542,39 @@ void ThreadMapPort()
     }
 }
 
-void MapPort(bool fUseUPnP)
+void StartMapPort()
 {
-    static std::unique_ptr<boost::thread> upnp_thread;
+    if (!g_upnp_thread.joinable()) {
+        assert(!g_upnp_interrupt);
+        g_upnp_thread = std::thread((std::bind(&TraceThread<void (*)()>, "upnp", &ThreadMapPort)));
+    }
+}
 
-    if (fUseUPnP)
-    {
-        if (upnp_thread) {
-            upnp_thread->interrupt();
-            upnp_thread->join();
-        }
-        upnp_thread.reset(new boost::thread(boost::bind(&TraceThread<void (*)()>, "upnp", &ThreadMapPort)));
+void InterruptMapPort()
+{
+    if(g_upnp_thread.joinable()) {
+        g_upnp_interrupt();
     }
-    else if (upnp_thread) {
-        upnp_thread->interrupt();
-        upnp_thread->join();
-        upnp_thread.reset();
+}
+
+void StopMapPort()
+{
+    if(g_upnp_thread.joinable()) {
+        g_upnp_thread.join();
+        g_upnp_interrupt.reset();
     }
 }
 
 #else
-void MapPort(bool)
+void StartMapPort()
+{
+    // Intentionally left blank.
+}
+void InterruptMapPort()
+{
+    // Intentionally left blank.
+}
+void StopMapPort()
 {
     // Intentionally left blank.
 }
@@ -2121,7 +2129,7 @@ bool CConnman::BindListenPort(const CService &addrBind, std::string& strError, b
     return true;
 }
 
-void Discover(boost::thread_group& threadGroup)
+void Discover()
 {
     if (!fDiscover)
         return;
diff --git a/src/net.h b/src/net.h
index 0542ec1aaa..8378a303b8 100644
--- a/src/net.h
+++ b/src/net.h
@@ -37,10 +37,6 @@
 class CScheduler;
 class CNode;
 
-namespace boost {
-    class thread_group;
-} // namespace boost
-
 /** Time between pings automatically sent out for latency probing and keepalive (in seconds). */
 static const int PING_INTERVAL = 2 * 60;
 /** Time after which to disconnect, after waiting for a ping response (or inactivity). */
@@ -441,8 +437,10 @@ private:
     friend struct CConnmanTest;
 };
 extern std::unique_ptr<CConnman> g_connman;
-void Discover(boost::thread_group& threadGroup);
-void MapPort(bool fUseUPnP);
+void Discover();
+void StartMapPort();
+void InterruptMapPort();
+void StopMapPort();
 unsigned short GetListenPort();
 bool BindListenPort(const CService &bindAddr, std::string& strError, bool fWhitelisted = false);
 
diff --git a/src/qt/optionsmodel.cpp b/src/qt/optionsmodel.cpp
index 4ade88d843..909be1c264 100644
--- a/src/qt/optionsmodel.cpp
+++ b/src/qt/optionsmodel.cpp
@@ -315,7 +315,12 @@ bool OptionsModel::setData(const QModelIndex & index, const QVariant & value, in
             break;
         case MapPortUPnP: // core option - can be changed on-the-fly
             settings.setValue("fUseUPnP", value.toBool());
-            MapPort(value.toBool());
+            if (value.toBool()) {
+                StartMapPort();
+            } else {
+                InterruptMapPort();
+                StopMapPort();
+            }
             break;
         case MinimizeOnClose:
             fMinimizeOnClose = value.toBool();
diff --git a/src/torcontrol.cpp b/src/torcontrol.cpp
index d875008ef2..717d1cf7e5 100644
--- a/src/torcontrol.cpp
+++ b/src/torcontrol.cpp
@@ -731,7 +731,7 @@ void TorController::reconnect_cb(evutil_socket_t fd, short what, void *arg)
 
 /****** Thread ********/
 static struct event_base *gBase;
-static boost::thread torControlThread;
+static std::thread torControlThread;
 
 static void TorControlThread()
 {
@@ -740,7 +740,7 @@ static void TorControlThread()
     event_base_dispatch(gBase);
 }
 
-void StartTorControl(boost::thread_group& threadGroup, CScheduler& scheduler)
+void StartTorControl()
 {
     assert(!gBase);
 #ifdef WIN32
@@ -754,7 +754,7 @@ void StartTorControl(boost::thread_group& threadGroup, CScheduler& scheduler)
         return;
     }
 
-    torControlThread = boost::thread(boost::bind(&TraceThread<void (*)()>, "torcontrol", &TorControlThread));
+    torControlThread = std::thread(std::bind(&TraceThread<void (*)()>, "torcontrol", &TorControlThread));
 }
 
 void InterruptTorControl()
diff --git a/src/torcontrol.h b/src/torcontrol.h
index 20514f7bbf..2be6701fa5 100644
--- a/src/torcontrol.h
+++ b/src/torcontrol.h
@@ -13,7 +13,7 @@
 extern const std::string DEFAULT_TOR_CONTROL;
 static const bool DEFAULT_LISTEN_ONION = true;
 
-void StartTorControl(boost::thread_group& threadGroup, CScheduler& scheduler);
+void StartTorControl();
 void InterruptTorControl();
 void StopTorControl();
 
diff --git a/src/validation.cpp b/src/validation.cpp
index 978aaf7d06..371460a6f0 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -1182,7 +1182,8 @@ static void AlertNotify(const std::string& strMessage)
     safeStatus = singleQuote+safeStatus+singleQuote;
     boost::replace_all(strCmd, "%s", safeStatus);
 
-    boost::thread t(runCommand, strCmd); // thread runs free
+    std::thread t(runCommand, strCmd);
+    t.detach(); // thread runs free
 }
 
 static void CheckForkWarningConditions()
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index 7f36aefeaf..513819606b 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -34,7 +34,6 @@
 #include <future>
 
 #include <boost/algorithm/string/replace.hpp>
-#include <boost/thread.hpp>
 
 std::vector<CWalletRef> vpwallets;
 /** Transaction fee set by the user */
@@ -976,7 +975,8 @@ bool CWallet::AddToWallet(const CWalletTx& wtxIn, bool fFlushOnClose)
     if (!strCmd.empty())
     {
         boost::replace_all(strCmd, "%s", wtxIn.GetHash().GetHex());
-        boost::thread t(runCommand, strCmd); // thread runs free
+        std::thread t(runCommand, strCmd);
+        t.detach(); // thread runs free
     }
 
     return true;