File: uniquepid.h

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/****************************************************************************
 *   Copyright (C) 2006-2008 by Jason Ansel, Kapil Arya, and Gene Cooperman *
 *   jansel@csail.mit.edu, kapil@ccs.neu.edu, gene@ccs.neu.edu              *
 *                                                                          *
 *  This file is part of DMTCP.                                             *
 *                                                                          *
 *  DMTCP is free software: you can redistribute it and/or                  *
 *  modify it under the terms of the GNU Lesser General Public License as   *
 *  published by the Free Software Foundation, either version 3 of the      *
 *  License, or (at your option) any later version.                         *
 *                                                                          *
 *  DMTCP 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 Lesser General Public License for more details.                     *
 *                                                                          *
 *  You should have received a copy of the GNU Lesser General Public        *
 *  License along with DMTCP:dmtcp/src.  If not, see                        *
 *  <http://www.gnu.org/licenses/>.                                         *
 ****************************************************************************/

#pragma once
#ifndef UNIQUEPID_H
#define UNIQUEPID_H

#include <sys/types.h>
#include "dmtcp.h"
#include "../jalib/jserialize.h"


namespace dmtcp
{
  struct UniquePid : private DmtcpUniqueProcessId
  {
  public:
    static UniquePid& ParentProcess();
    static UniquePid& ThisProcess(bool disableJTrace = false);
    UniquePid();

    UniquePid ( const uint64_t& host, const pid_t& pd, const uint64_t& tm,
                const int& gen = 0 ) {
      _hostid = host;
      _pid = pd;
      _time = tm;
      _computation_generation = gen;
    }

    UniquePid(DmtcpUniqueProcessId id) {
      _hostid = id._hostid;
      _pid = id._pid;
      _time = id._time;
      _computation_generation = id._computation_generation;
    }

    uint64_t hostid() const { return _hostid; }
    pid_t pid() const { return _pid; }
    int computationGeneration() const { return _computation_generation; }
    uint64_t time() const { return _time; }
    DmtcpUniqueProcessId upid() const {
      DmtcpUniqueProcessId up;
      up._hostid = _hostid;
      up._pid = _pid;
      up._time = _time;
      up._computation_generation = _computation_generation;
      return up;
    }

    void incrementGeneration();

    static void serialize( jalib::JBinarySerializer& o );

    bool operator< ( const UniquePid& that ) const;
    bool operator== ( const UniquePid& that ) const;
    bool operator!= ( const UniquePid& that ) const { return ! operator== ( that ); }

    static void restart();
    static void resetOnFork ( const UniquePid& newId );

    string toString() const;

    bool isNull() const;
  };

  ostream& operator << ( ostream& o,const UniquePid& id );
  ostream& operator << ( ostream& o,const DmtcpUniqueProcessId& id );
  bool operator==(const DmtcpUniqueProcessId& a, const DmtcpUniqueProcessId& b);
  bool operator!=(const DmtcpUniqueProcessId& a, const DmtcpUniqueProcessId& b);
}

#endif