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atomic_i686.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_ATOMIC_I686_HPP
#define EC_ATOMIC_I686_HPP

namespace eqn_cruncher
{
  void
  atomic_make_zero(int* _flag);

  void
  atomic_wait_till_not_zero(int* _flag);

  // Processor specific Mutes class.
  class Mutex
  {
    // _flag -> 0 Unlocked state. _flag -> 1 Locked state.
    // This Mutex uses a spin lock internally.
    int _flag;
    Mutex(Mutex const&);
    Mutex& operator=(Mutex const&);

  public:
    Mutex() : _flag(0) { }

    void
    lock();

    void
    unlock()
    { atomic_make_zero(&_flag); }
  };

}

#endif // EC_ATOMIC_I686_HPP

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