some fixes

src/common/util.h

@@ -4,6 +4,7 @@
 
 #pragma once 
 
+#include <mutex>
 #include <system_error>
 #include <boost/filesystem.hpp>
 
@@ -26,4 +27,60 @@ namespace tools
     s.append(reinterpret_cast<const char*>(&pot.time), sizeof(pot.time));
     return crypto::cn_fast_hash(s.data(), s.size());
   }
+
+
+  class signal_handler
+  {
+  public:
+    template<typename T>
+    static bool install(T t)
+    {
+#if defined(WIN32)
+      bool r = TRUE == ::SetConsoleCtrlHandler(&win_handler, TRUE);
+      if (r)
+      {
+        m_handler = t;
+      }
+      return r;
+#else
+      signal(SIGINT, posix_handler);
+      signal(SIGTERM, posix_handler);
+      m_handler = t;
+      return true;
+#endif
+    }
+
+  private:
+#if defined(WIN32)
+    static BOOL win_handler(DWORD type)
+    {
+      if (CTRL_C_EVENT == type || CTRL_BREAK_EVENT == type)
+      {
+        handle_signal();
+        return TRUE;
+      }
+      else
+      {
+        LOG_PRINT_RED_L0("Got control signal " << type << ". Exiting without saving...");
+        return FALSE;
+      }
+      return TRUE;
+    }
+#else
+    static void posix_handler(int /*type*/)
+    {
+      handle_signal();
+    }
+#endif
+
+    static void handle_signal()
+    {
+      static std::mutex m_mutex;
+      std::unique_lock<std::mutex> lock(m_mutex);
+      m_handler();
+    }
+
+  private:
+    static std::function<void(void)> m_handler;
+  };
 }