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// $Id: ReventLoop.hpp 513 2013-05-01 14:02:06Z mueller $
//
// Copyright 2013- by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>
//
// This program is free software; you may redistribute and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 2, 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 complete details.
// 
// Revision History: 
// Date         Rev Version  Comment
// 2013-05-01   513   1.1.1  fTraceLevel now uint32_t
// 2013-02-22   491   1.1    use new RlogFile/RlogMsg interfaces
// 2013-01-11   473   1.0    Initial version
// ---------------------------------------------------------------------------
 
 
/*!
  \file
  \version $Id: ReventLoop.hpp 513 2013-05-01 14:02:06Z mueller $
  \brief   Declaration of class \c ReventLoop.
*/
 
#ifndef included_Retro_ReventLoop
#define included_Retro_ReventLoop 1
 
#include <poll.h>
 
#include <cstdint>
#include <vector>
 
#include "boost/utility.hpp"
#include "boost/function.hpp"
#include "boost/thread/mutex.hpp"
#include "boost/shared_ptr.hpp"
 
#include "librtools/RlogFile.hpp"
 
namespace Retro {
 
  class ReventLoop : private boost::noncopyable {
    public:
      typedef boost::function<int(const pollfd&)> pollhdl_t;
 
                    ReventLoop();
      virtual      ~ReventLoop();
 
      void          AddPollHandler(const pollhdl_t& pollhdl,
                               int fd, short events=POLLIN);
      bool          TestPollHandler(int fd, short events=POLLIN);
      void          RemovePollHandler(int fd, short events, bool nothrow=false);
      void          RemovePollHandler(int fd);
 
      void          SetLogFile(const boost::shared_ptr<RlogFile>& splog);
      void          SetTraceLevel(uint32_t level);
      uint32_t      TraceLevel() const;
 
      void          Stop();
      virtual void  EventLoop();
 
      virtual void  Dump(std::ostream& os, int ind=0, const char* text=0) const;
 
    protected: 
 
      int           DoPoll(int timeout=-1);
      void          DoCall(void);
 
    protected: 
 
      struct PollDsc {
        pollhdl_t   fHandler;
        int         fFd;
        short       fEvents;
        PollDsc(pollhdl_t hdl,int fd,short evts) :
          fHandler(hdl),fFd(fd),fEvents(evts)  {}
      };
 
      bool          fLoopActive;
      bool          fUpdatePoll;
      boost::mutex  fPollDscMutex;
      std::vector<PollDsc>   fPollDsc;
      std::vector<pollfd>    fPollFd;
      std::vector<pollhdl_t> fPollHdl;
      uint32_t      fTraceLevel;            //!< trace level
      boost::shared_ptr<RlogFile>  fspLog;  //!< log file ptr
};
 
} // end namespace Retro
 
#include "ReventLoop.ipp"
 
#endif