Add LZMA.

3rdparty/lzma-21.03beta/CPP/7zip/Common/VirtThread.h

@@ -0,0 +1,24 @@
+// VirtThread.h
+
+#ifndef __VIRT_THREAD_H
+#define __VIRT_THREAD_H
+
+#include "../../Windows/Synchronization.h"
+#include "../../Windows/Thread.h"
+
+struct CVirtThread
+{
+  NWindows::NSynchronization::CAutoResetEvent StartEvent;
+  NWindows::NSynchronization::CAutoResetEvent FinishedEvent;
+  NWindows::CThread Thread;
+  bool Exit;
+
+  ~CVirtThread() { WaitThreadFinish(); }
+  void WaitThreadFinish(); // call it in destructor of child class !
+  WRes Create();
+  WRes Start();
+  virtual void Execute() = 0;
+  WRes WaitExecuteFinish() { return FinishedEvent.Lock(); }
+};
+
+#endif