public void Add(WorkItem wi, int priority) {
Contract.Requires(wi != null);
string/*!*/ lab = wi.getLabel();
Contract.Assert(lab != null);
if (labels.Contains(lab)) {
// Already on worklist
return;
}
labels.Add(lab);
if (!workList.ContainsKey(priority)) {
workList.Add(priority, new List<WorkItem/*!*/>());
}
workList[priority].Add(wi);
if (!priorities.ContainsKey(priority)) {
priorities.Add(priority, 0);
}
priorities[priority] = priorities[priority] + 1;
}