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// scheduler.cc
//  {{{
//
// Copyright (C) 2004 Nicolas Schodet
//
// 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.
//
// Contact :
//        Web: http://perso.efrei.fr/~schodet/
//      Email: <contact@ni.fr.eu.org>
// }}}
#include "scheduler.hh"
#include "utils/fd_set.hh"

#include <stdlib.h> //XXX
#include <sys/types.h>
#include <sys/time.h>

namespace scheduler {

/// Destructeur.
Scheduler::~Scheduler (void)
{
    // TODO: Test for schedulables_ empty ?
}

/// Ajoute un �l�ment schedulable.
void
Scheduler::insert (Schedulable &schedulable)
{
    schedulables_.insert (&schedulable);
}

/// Enl�ve un �l�ment schedulable.
void
Scheduler::erase (Schedulable &schedulable)
{
    schedulables_.erase (&schedulable);
}

/// Lance le scheduler. Si timeout est diff�rent de -1, c'est le temps
/// maximal que prend le scheduler avant de rendre la main. Si
/// returnOnEvent est true, le premier �venement arr�te le scheduler.
/// Renvois true si au moins un �v�nement a �t� trait�.
bool
Scheduler::schedule (int timeout/*-1*/, bool returnOnEvent/*false*/)
{
    bool event = false;
    int t = time (0) * 1000; //XXX
    int start = t;
    do
      {
	// Pr�pare le select.
	int to = timeout == -1 ? -1 : start + timeout - t;
	FdSet readFds;
	for (Schedulables::const_iterator i = schedulables_.begin ();
	     i != schedulables_.end ();
	     ++i)
	  {
	    int top = -1;
	    (*i)->setup (*this, t, readFds, top);
	    if (to == -1 || top != -1 && top < to)
	      {
		to = top;
	      }
	  }
	// Select.
	timeval tv;
	tv.tv_sec = to / 1000;
	tv.tv_usec = to % 1000 * 1000;
	select (FD_SETSIZE, readFds.get (), 0, 0, &tv);
	// Run.
	t = time (0) * 1000; //XXX
	for (Schedulables::const_iterator i = schedulables_.begin ();
	     i != schedulables_.end ();
	     ++i)
	    event |= (*i)->run (*this, t, readFds);
	t = time (0) * 1000; //XXX
      } while (!(returnOnEvent && event) && start + timeout > t); //XXX
    return event;
}

} // namespace scheduler