public Sheep addSheep(int x, int y, WanderDelegate wander, EvadeOrHuntDelegate evade)
{
if (_wolves.Count + _sheep.Count < _table.Length)
{
Sheep sheep = new Sheep(this, wander, evade);
_sheep.Add(sheep);
sheep.activate(x, y);
return(sheep);
}
return(null);
}
public override bool waitMove(Direction dir, int timeoutMilliseconds)
{
int x = -1, y = -1;
switch (dir)
{
case Direction.Up: x = _x; y = _y - 1;
break;
case Direction.Down: x = _x; y = _y + 1;
break;
case Direction.Left: x = _x - 1; y = _y;
break;
case Direction.Right: x = _x + 1; y = _y;
break;
default: return(false);
}
Sheep labChomps = _table.Table[y, x].CurrentSheep;
if (labChomps != null)
{
labChomps.sendToHeaven(); //i.e. eat the sheep
_sheepEaten++;
//We should not call table.addWolf as that would call WaitOne on a mutex we already own
//Wolf wolf = new Wolf(_table, _wander, _evadeOrHunt);
}
if (!isValidPosition(x, y))
{
return(false);
}
if (_ownedWolfMutex != _table.Table[y, x].WolfMutex)
{
if (_table.Table[y, x].WolfMutex.WaitOne(timeoutMilliseconds, false))
{
_ownedWolfMutex = _table.Table[y, x].WolfMutex;
_table.Table[y, x].CurrentWolf = this;
//We can do this as a thread has to acquire the mutex before changing the CurrentWolf
CurrentCell.WolfMutex.ReleaseMutex();
CurrentCell.CurrentWolf = null;
_x = x;
_y = y;
//Before leaving a square a sheep will probe the WolfMutex
//If it is taken, it will stay there - need to make sure this cannot cause deadlock
labChomps = _table.Table[y, x].CurrentSheep;
if (labChomps != null)
{
labChomps.sendToHeaven(); //i.e. eat the sheep
_sheepEaten++;
//We should not call table.addWolf as that would call WaitOne on a mutex we already own
//Wolf wolf = new Wolf(_table, _wander, _evadeOrHunt);
}
return(true);
}
}
return(false);
}
public Sheep addSheep(int x, int y, WanderDelegate wander, EvadeOrHuntDelegate evade)
{
if (_wolves.Count + _sheep.Count < _table.Length)
{
Sheep sheep = new Sheep(this, wander, evade);
_sheep.Add(sheep);
sheep.activate(x, y);
return sheep;
}
return null;
}
