protected virtual void Dispose(bool disposing)
{
if (disposing && (state & StateDisposed) == 0)
{
if (CustomInterlocked.CompareExchange(ref state, StateDisposed, StateValid) == StateValid)
{
UnregisterLinkedTokens();
callbacks = null;
}
else
{
if (handle != null)
{
handle.WaitOne();
}
state |= StateDisposed;
Thread.MemoryBarrier();
}
if (timer != null)
{
Timer.Dispose();
}
((IDisposable)handle).Dispose();
handle = null;
}
}
public void CancelAfter(int millisecondsDelay)
{
if (millisecondsDelay < -1)
{
throw new ArgumentOutOfRangeException("millisecondsDelay");
}
CheckDisposed();
if (IsCancellationRequested || millisecondsDelay == Timeout.Infinite)
{
return;
}
if (timer == null)
{
// Have to be carefull not to create secondary background timer
var t = new Timer(timer_callback, this, Timeout.Infinite, Timeout.Infinite);
if (CustomInterlocked.CompareExchange(ref timer, t, null) != null)
{
t.Dispose();
}
}
Timer.Change(millisecondsDelay, Timeout.Infinite);
}
long UpdateStateWithOp(bool set)
{
int oldValue, newValue;
do
{
oldValue = state;
newValue = (int)(((oldValue >> 1) + 1) << 1) | (set ? 1 : 0);
} while (CustomInterlocked.CompareExchange(ref state, newValue, oldValue) != oldValue);
return(newValue);
}
bool ApplyOperation(int num, out int newValue)
{
int oldCount;
do
{
oldCount = initialCount;
if (oldCount == 0)
{
newValue = 0;
return(false);
}
newValue = oldCount + num;
if (newValue < 0)
{
return(false);
}
} while (CustomInterlocked.CompareExchange(ref initialCount, newValue, oldCount) != oldCount);
return(true);
}
void Cancellation(bool throwOnFirstException)
{
if (CustomInterlocked.CompareExchange(ref state, StateCanceled, StateValid) != StateValid)
{
return;
}
handle.Set();
if (linkedTokens != null)
{
UnregisterLinkedTokens();
}
var cbs = callbacks;
if (cbs == null)
{
return;
}
List <Exception> exceptions = null;
try {
Action cb;
for (int id = currId; id != int.MinValue; id--)
{
if (!cbs.TryRemove(new CancellationTokenRegistration(id, this), out cb))
{
continue;
}
if (cb == null)
{
continue;
}
if (throwOnFirstException)
{
cb();
}
else
{
try {
cb();
} catch (Exception e) {
if (exceptions == null)
{
exceptions = new List <Exception> ();
}
exceptions.Add(e);
}
}
}
} finally {
cbs.Clear();
}
if (exceptions != null)
{
throw new AggregateException(exceptions);
}
}
