Bug/30 server connection problem (#31)

* use threads instead of std::async, need to cleanup threads

* less buggy server connection per thread system

ixwebsocket/IXSocketServer.cpp

@@ -136,6 +136,12 @@ namespace ix
 
     void SocketServer::stop()
     {
+        for (auto&& thread : _connectionsThreads)
+        {
+            if (!thread.joinable()) continue;
+            thread.join();
+        }
+
         if (!_thread.joinable()) return; // nothing to do
 
         _stop = true;
@@ -157,9 +163,6 @@ namespace ix
         // Set the socket to non blocking mode, so that accept calls are not blocking
         SocketConnect::configure(_serverFd);
 
-        // Return value of std::async, ignored
-        std::future<void> f;
-
         for (;;)
         {
             if (_stop) return;
@@ -228,14 +231,10 @@ namespace ix
             }
 
             // Launch the handleConnection work asynchronously in its own thread.
-            //
-            // the destructor of a future returned by std::async blocks,
-            // so we need to declare it outside of this loop
-            f = std::async(std::launch::async,
-                           &SocketServer::handleConnection,
-                           this,
-                           clientFd,
-                           connectionState);
+            _connectionsThreads.push_back(std::thread(&SocketServer::handleConnection,
+                                          this,
+                                          clientFd,
+                                          connectionState));
         }
     }
 }

ixwebsocket/IXSocketServer.h

@@ -12,6 +12,7 @@
 #include <string>
 #include <set>
 #include <thread>
+#include <vector>
 #include <mutex>
 #include <functional>
 #include <memory>
@@ -63,6 +64,8 @@ namespace ix
         std::atomic<bool> _stop;
         std::thread _thread;
 
+        std::vector<std::thread> _connectionsThreads;
+
         std::condition_variable _conditionVariable;
         std::mutex _conditionVariableMutex;