/*
 * Copyright (c) 1998 Stephen Williams (steve@icarus.com)
 *
 *    This source code is free software; you can redistribute it
 *    and/or modify it in source code form 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(WINNT)
#ident "$Id: vvm_pevent.cc,v 1.1 1998/11/09 23:44:11 steve Exp $"
#endif

# include  "vvm.h"
# include  "vvm_gates.h"

vvm_pevent::vvm_pevent()
: value_(V0), hold_(0)
{
}

void vvm_pevent::wait(EDGE edge, vvm_thread*thr)
{
      assert(hold_ == 0);
      hold_ = thr;
      hold_edge_ = edge;
}

void vvm_pevent::set(vvm_simulation*sim, unsigned, vvm_bit_t val)
{
      if (hold_ == 0) {
	    value_ = val;
	    return;
      }

      if (value_ != val) {
	    vvm_thread*tmp;
	    switch (hold_edge_) {
		case ANYEDGE:
		  tmp = hold_;
		  hold_ = 0;
		  sim->thread_active(tmp);
		  break;
		case POSEDGE:
		  if (val == V1) {
			tmp = hold_;
			hold_ = 0;
			sim->thread_active(tmp);
		  }
		  break;
		case NEGEDGE:
		  if (val == V0) {
			tmp = hold_;
			hold_ = 0;
			sim->thread_active(tmp);
		  }
		  break;
	    }
	    value_ = val;
      }
}

/*
 * $Log: vvm_pevent.cc,v $
 * Revision 1.1  1998/11/09 23:44:11  steve
 *  Add vvm library.
 *
 */