static long WorkingSort <T>(HashSet <Tuple <T, int> > nodes, HashSet <Tuple <T, T> > edges,
int workersCount)
where T : IEquatable <T>
{
// Empty list that will contain the sorted elements
long duration = -1;
// Set of all nodes with no incoming edges
var S = new HashSet <T>(
nodes.Where(n => edges.All(e => e.Item2.Equals(n.Item1) == false)).
Select(t => t.Item1)).OrderBy(t => t).ToList();
// while S is non-empty do
Workers <T> workers = new Workers <T>(workersCount);
while (true)
{
duration++;
foreach (var worker in workers.Items)
{
if (worker.Finished(duration))
{
foreach (var e in edges.Where(e => e.Item1.Equals(worker.Node)).ToList())
{
var m = e.Item2;
// remove edge e from the graph
edges.Remove(e);
// if m has no other incoming edges then
if (edges.All(me => me.Item2.Equals(m) == false))
{
// insert m into S
S.Add(m);
}
}
worker.Free();
}
}
if (S.Any())
{
while (S.Any() && workers.GetFreeWorker() != null)
{
var n = S.First();
workers.GetFreeWorker().Start(n,
nodes.First(t => t.Item1.Equals(n)).Item2,
duration);
S.Remove(n);
}
}
else
{
if (workers.FreeCount == workersCount)
{
break;
}
}
Debug.WriteLine($"{duration} - {workers.ToString()}");
}
// if graph has edges then
if (edges.Any())
{
// return error (graph has at least one cycle)
return(-1);
}
else
{
// return L (a topologically sorted order)
return(duration);
}
}