/usr/include/rserpool/thread.h is in libcpprspserver-dev 2.7.13-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 * --------------------------------------------------------------------------
 *
 *              //===//   //=====   //===//   //       //   //===//
 *             //    //  //        //    //  //       //   //    //
 *            //===//   //=====   //===//   //       //   //===<<
 *           //   \\         //  //        //       //   //    //
 *          //     \\  =====//  //        //=====  //   //===//    Version II
 *
 * ------------- An Efficient RSerPool Prototype Implementation -------------
 *
 * Copyright (C) 2002-2011 by Thomas Dreibholz
 *
 * 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 3 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/>.
 *
 * Contact: dreibh@iem.uni-due.de
 */
#ifndef THREAD_H
#define THREAD_H
#include <pthread.h>
#include "mutex.h"
class TDThread : public TDMutex
{
   public:
   TDThread();
   virtual ~TDThread();
   inline bool isRunning() const {
      return(MyThread != 0);
   }
   inline bool isStopping() {
      lock();
      const bool stopping = Stopping;
      unlock();
      return(stopping);
   }
   virtual bool start();
   virtual void stop();
   void waitForFinish();
   static void delay(const unsigned int us);
   protected:
   virtual void run() = 0;
   protected:
   pthread_t MyThread;
   private:      
   static void* startRoutine(void* object);   
   bool         Stopping;
};
#endif
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