/// <summary>
/// Takes the next item from the pipeline, or blocks until an item
/// is recieved.
/// </summary>
/// <returns>The next item.</returns>
public T Take(out bool retrieved)
{
if (this.m_OutputThread != Thread.CurrentThread.ManagedThreadId)
{
throw new InvalidOperationException("Only the output thread may retrieve items from TaskPipeline.");
}
// Wait until there is an item to take.
var spin = new SpinWait();
while (this.m_Head == null)
{
spin.SpinOnce();
}
// Return the item and exchange the current head with
// the next item, all in an atomic operation.
var head = m_Head;
retry:
var next = head.Next;
if (Interlocked.CompareExchange(ref head.Next, TaskPipelineEntry <T> .Sentinel, next) != next)
{
goto retry;
}
this.m_Head = next;
retrieved = true;
return(head.Value);
}
/// <summary>
/// Puts an item into the queue to be processed.
/// </summary>
/// <param name="value">Value.</param>
public void Put(T value)
{
if (this.m_InputThread != Thread.CurrentThread.ManagedThreadId)
{
throw new InvalidOperationException("Only the input thread may place items into TaskPipeline.");
}
lock (this)
{
var head = this.m_Head;
while (head != null && head.Next != null)
{
head = head.Next;
}
if (head == null)
{
m_Head = new TaskPipelineEntry <T> {
Value = value
};
}
else
{
head.Next = new TaskPipelineEntry <T> {
Value = value
};
}
}
}
/// <summary>
/// Takes the next item from the pipeline, or blocks until an item
/// is recieved.
/// </summary>
/// <returns>The next item.</returns>
public T Take()
{
if (this.m_OutputThread != Thread.CurrentThread.ManagedThreadId)
{
throw new InvalidOperationException("Only the output thread may retrieve items from TaskPipeline.");
}
// Return if no value.
var spin = new SpinWait();
while (this.m_Head == null)
{
spin.SpinOnce();
}
T value;
lock (this)
{
value = m_Head.Value;
m_Head = m_Head.Next;
}
return(value);
}
/// <summary>
/// Takes the next item from the pipeline, or blocks until an item
/// is recieved.
/// </summary>
/// <returns>The next item.</returns>
public T Take(out bool retrieved)
{
if (this.m_OutputThread != Thread.CurrentThread.ManagedThreadId)
{
throw new InvalidOperationException("Only the output thread may retrieve items from TaskPipeline.");
}
// Return if no value.
if (this.m_Head == null)
{
retrieved = false;
return(default(T));
}
T value;
lock (this)
{
value = m_Head.Value;
m_Head = m_Head.Next;
}
retrieved = true;
return(value);
}
