public void Enqueue(WaitNode w)
{
if (_tail == null)
{
_head = _tail = w;
}
else
{
_tail.NextWaitNode = w;
_tail = w;
}
}
public WaitNode Dequeue()
{
if (_head == null)
{
return(null);
}
var w = _head;
_head = w.NextWaitNode;
if (_head == null)
{
_tail = null;
}
w.NextWaitNode = null;
return(w);
}
public void TakeOver(WaitNode node)
{
lock (this)
{
Debug.Assert(_holds == 1 && _owner == Thread.CurrentThread);
_owner = node.Owner;
}
}
public override bool TryLock(TimeSpan timespan)
{
var caller = Thread.CurrentThread;
lock (this)
{
if (GetHold(caller)) return true;
}
var n = new WaitNode();
return n.DoTimedWait(this, timespan);
}
public override void LockInterruptibly()
{
var caller = Thread.CurrentThread;
lock (this)
{
if (GetHold(caller)) return;
}
var n = new WaitNode();
n.DoWait(this);
}
public bool Recheck(WaitNode node)
{
var caller = Thread.CurrentThread;
lock (this)
{
if (GetHold(caller)) return true;
_wq.Enqueue(node);
return false;
}
}
public void Enqueue(WaitNode w)
{
if (_tail == null)
_head = _tail = w;
else
{
_tail.NextWaitNode = w;
_tail = w;
}
}
public WaitNode Dequeue()
{
if (_head == null) return null;
var w = _head;
_head = w.NextWaitNode;
if (_head == null) _tail = null;
w.NextWaitNode = null;
return w;
}
public void TakeOver(WaitNode node)
{
}
public bool Recheck(WaitNode node)
{
return false;
}
private void DoWait(Action<WaitNode> action)
{
var holdCount = Lock.HoldCount;
if (holdCount == 0)
{
throw new SynchronizationLockException();
}
var n = new WaitNode();
_wq.Enqueue(n);
for (var i = holdCount; i > 0; i--) Lock.Unlock();
try
{
action(n);
}
finally
{
for (var i = holdCount; i > 0; i--) Lock.Lock();
}
}