[host] added multi-threaded memcopy for high resolutions

host/MultiMemcpy.h

@@ -0,0 +1,48 @@
+/*
+Looking Glass - KVM FrameRelay (KVMFR) Client
+Copyright (C) 2017 Geoffrey McRae <geoff@hostfission.com>
+https://looking-glass.hostfission.com
+
+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, write to the Free Software Foundation, Inc., 59 Temple
+Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#define MULTIMEMCPY_THREADS 4
+
+#include <Windows.h>
+#include <stdint.h>
+
+#pragma once
+class MultiMemcpy
+{
+public:
+  MultiMemcpy();
+  ~MultiMemcpy();
+
+  void Copy(void * dst, void * src, size_t size);
+private:
+  struct Worker
+  {
+    HANDLE  start;
+    HANDLE  stop;
+    HANDLE  thread;
+    void  * dst;
+    void  * src;
+    size_t  size;
+  };
+
+  HANDLE m_semaphores[MULTIMEMCPY_THREADS];
+  struct Worker m_workers[MULTIMEMCPY_THREADS];
+  static DWORD WINAPI WorkerFunction(LPVOID param);
+};
+