public static void Clear(UnsafeMPMCQueue *queue)
{
UDebug.Assert(queue != null);
UDebug.Assert(queue->_head != null);
queue->_crossSegmentLock.Lock();
queue->_tail->EnsureFrozenForEnqueues();
var segmentsize = INITIAL_SEGMENT_LENGTH;
if (queue->_fixedSize)
{
segmentsize = queue->_tail->Capacity;
}
// Free all segments
var segment = queue->_head;
do
{
var next = segment->_nextSegment;
QueueSegment.Free(segment);
segment = next;
}while (segment != null);
queue->_tail = queue->_head = QueueSegment.Allocate(segmentsize, queue->_slotStride, queue->_slotOffset);
queue->_crossSegmentLock.Unlock();
}
private bool TryDequeueSlow <T>(out T result) where T : unmanaged
{
while (true)
{
QueueSegment *head = _head;
if (head->TryDequeue(out result))
{
return(true);
}
if (head->_nextSegment == null)
{
result = default;
return(false);
}
UDebug.Assert(head->_frozen);
if (head->TryDequeue(out result))
{
return(true);
}
_crossSegmentLock.Lock();
if (head == _head)
{
var next = head->_nextSegment;
QueueSegment.Free(head);
_head = next;
}
_crossSegmentLock.Unlock();
}
}
public static void Free(UnsafeMPMCQueue *queue)
{
if (queue == null)
{
return;
}
// Free all segments
var segment = queue->_head;
do
{
var next = segment->_nextSegment;
QueueSegment.Free(segment);
segment = next;
}while (segment != null);
// Clear queue memory (just in case)
*queue = default;
// Free queue memory, if this is a fixed queue it frees the items memory at the same time
Memory.Free(queue);
}
