private bool TryRequestItem(DispatchThread thread, out int priority, out Action callback)
{
// check if we can find a work-item in the shared queue
if (_inbox.TryDequeue(out priority, out callback))
{
return(true);
}
// try to steal a work-item from another thread; take a snapshot of all allocated threads (needed in case the array is copied for resizing)
DispatchThread[] threads = _activeThreads;
foreach (DispatchThread entry in threads)
{
// check if we can steal a work-item from this thread
if ((entry != null) && !ReferenceEquals(entry, thread) && entry.TryStealWorkItem(out callback))
{
priority = ((PrioritizedThreadPool)entry.DispatchQueue).Priority;
return(true);
}
}
// check again if we can find a work-item in the shared queue since trying to steal may have overlapped with the arrival of a new item
if (_inbox.TryDequeue(out priority, out callback))
{
return(true);
}
return(false);
}
