public bool EnqueueWorkItem(WorkItem workItem)
{
// A work item cannot be null, since null is used in the
// WaitForWorkItem() method to indicate timeout or cancel
if (null == workItem)
{
throw new ArgumentNullException("workItem", "workItem cannot be null");
}
bool enqueue = true;
// First check if there is a waiter waiting for work item. During
// the check, timed out waiters are ignored. If there is no
// waiter then the work item is queued.
lock (this)
{
ValidateNotDisposed();
if (!_isWorkItemsQueueActive)
{
return false;
}
while (_waitersCount > 0)
{
// Dequeue a waiter.
WaiterEntry waiterEntry = PopWaiter();
// Signal the waiter. On success break the loop
if (waiterEntry.Signal(workItem))
{
enqueue = false;
break;
}
}
if (enqueue)
{
// Enqueue the work item
_workItems.Enqueue(workItem);
}
}
return true;
}