Core/Threading: Create ThreadPool class

# Conflicts:
#	src/server/worldserver/Main.cpp

src/common/Threading/ThreadPool.h

@@ -0,0 +1,48 @@
+/*
+ * This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef TRINITY_THREAD_POOL_H
+#define TRINITY_THREAD_POOL_H
+
+#include <boost/asio/post.hpp>
+#include <boost/asio/thread_pool.hpp>
+#include <thread>
+
+namespace Trinity
+{
+class ThreadPool
+{
+public:
+    explicit ThreadPool(std::size_t numThreads = std::thread::hardware_concurrency()) : _impl(numThreads) { }
+
+    template<typename T>
+    decltype(auto) PostWork(T&& work)
+    {
+        return boost::asio::post(_impl, std::forward<T>(work));
+    }
+
+    void Join()
+    {
+        _impl.join();
+    }
+
+private:
+    boost::asio::thread_pool _impl;
+};
+}
+
+#endif // TRINITY_THREAD_POOL_H

src/server/worldserver/Main.cpp

@@ -48,6 +48,7 @@
 #include "ScriptReloadMgr.h"
 #include "TCSoap.h"
 #include "TerrainMgr.h"
+#include "ThreadPool.h"
 #include "World.h"
 #include "WorldSocket.h"
 #include "WorldSocketMgr.h"
@@ -239,20 +240,13 @@ extern int main(int argc, char** argv)
 
     // Start the Boost based thread pool
     int numThreads = sConfigMgr->GetIntDefault("ThreadPool", 1);
-    std::shared_ptr<std::vector<std::thread>> threadPool(new std::vector<std::thread>(), [ioContext](std::vector<std::thread>* del)
-    {
-        ioContext->stop();
-        for (std::thread& thr : *del)
-            thr.join();
-
-        delete del;
-    });
-
     if (numThreads < 1)
         numThreads = 1;
 
+    std::shared_ptr<Trinity::ThreadPool> threadPool = std::make_shared<Trinity::ThreadPool>(numThreads);
+
     for (int i = 0; i < numThreads; ++i)
-        threadPool->push_back(std::thread([ioContext]() { ioContext->run(); }));
+        threadPool->PostWork([ioContext]() { ioContext->run(); });
 
     // Set process priority according to configuration settings
     SetProcessPriority("server.worldserver", sConfigMgr->GetIntDefault(CONFIG_PROCESSOR_AFFINITY, 0), sConfigMgr->GetBoolDefault(CONFIG_HIGH_PRIORITY, false));
@@ -389,6 +383,8 @@ extern int main(int argc, char** argv)
     WorldUpdateLoop();
 
     // Shutdown starts here
+    ioContext->stop();
+
     threadPool.reset();
 
     sLog->SetSynchronous();