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node_manager.hpp

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/*
 * Equation Cruncher
 * Copyright (C) 2004  Dhruv Matani(dhruvbird@yahoo.com)
 * 
 * 
 * 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 2 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 */


#if !defined EC_NODE_MANAGER_HPP
#define EC_NODE_MANAGER_HPP

#include <list>
#include <vector>
#include <stdexcept>

#include "concurrence.hpp"
#include "ports.hpp"
#include "socket.hpp"
#include "udefs.hpp"
#include "glob_log.hpp"
#include "atomic_i686.hpp"
#include "config.hpp"

#include <iostream>

namespace eqn_cruncher
{
  struct pkt_header
  {
    int size;
    int type;
    int code;
    double reserved;

    pkt_header() : reserved(0)
    { }
  };

  class packet_error : public std::runtime_error
  {
  public:
    packet_error(std::string const& str = "packet_error")
      : std::runtime_error(str)
    { }
  };


  class node_manager
  {
    std::list<eqn_cruncher::socket> sock_list;
#if USE_PTHREAD_MUTEX
    pthr_lock sl_lock;
#else
    Mutex sl_lock;
#endif

    static const unsigned int buff_size = 4092;
    static const unsigned int max_size = buff_size - sizeof(pkt_header);
    static const unsigned int max_doubles = max_size / sizeof(double);

  public:
    enum { 
      data, 
      command };

    enum { 
      quit, 
      start, 
      result, 
      reset_client, 
      reset_subclient };


    int
    test_and_get()
    {
      int ret = -1;
      sl_lock.lock();
      if (!sock_list.empty())
        {
          ret = sock_list.back().get_sockid();
          sock_list.pop_back();
        }
      sl_lock.unlock();
      return ret;
    }

    void
    recycle_socket(int sock_id)
    {
      sl_lock.lock();
      sock_list.push_back(eqn_cruncher::socket(sock_id));
      sl_lock.unlock();
    }

    void
    send_vector(eqn_cruncher::matrix_t const& dv, eqn_cruncher::socket s);


    void
    server(server_data* psd);


    double
    get_vector(eqn_cruncher::socket s, unsigned int mat_size, 
               double(*det_proc)(matrix_t const&));


    void
    close_sockets();


    void
    send_message(eqn_cruncher::pkt_header ph);


    void
    send_reset_client_msg();


    void
    send_reset_subclient_msg();


    void
    send_quit_msg();
  };
}

#endif // EC_NODE_MANAGER_HPP

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