private LockSource[] FindFirstExclusiveReader(ExclusiveReaderLock erLock)
{
if (erLock.Tail == null)
{
return(new LockSource[0]);
}
var item = _head;
while (item != erLock.Tail)
{
if (item.IsWriter)
{
return(new LockSource[0]);
}
if ((item as ExclusiveReaderLockSource)?.ExclusiveReaderLock == erLock)
{
return(new[] { item });
}
item = item.Next;
}
return(new[] { item });
}
private Task <IAsyncReaderWriterLockToken> ExclusiveReaderLockAsync(ExclusiveReaderLock erLock, CancellationToken cancellationToken = default(CancellationToken))
{
TaskUtilities.AssertIsOnBackgroundThread();
if (cancellationToken.IsCancellationRequested)
{
return(Task.FromCanceled <IAsyncReaderWriterLockToken>(cancellationToken));
}
var source = new ExclusiveReaderLockSource(this, erLock);
_queue.AddExclusiveReader(source, out var isAddedAfterWriterOrExclusiveReader);
if (isAddedAfterWriterOrExclusiveReader)
{
source.RegisterCancellation(cancellationToken);
}
else
{
source.Release();
}
return(source.Task);
}
public ExclusiveReaderLockSource(AsyncReaderWriterLock host, ExclusiveReaderLock erLock) : base(host, false)
{
ExclusiveReaderLock = erLock;
}
public ExclusiveReaderLockSource(AsyncReaderWriterLock host, ExclusiveReaderLock erLock) : base(host, false) {
ExclusiveReaderLock = erLock;
}
private LockSource[] FindFirstExclusiveReader(ExclusiveReaderLock erLock) {
if (erLock.Tail == null) {
return new LockSource[0];
}
var item = _head;
while (item != erLock.Tail) {
if (item.IsWriter) {
return new LockSource[0];
}
if ((item as ExclusiveReaderLockSource)?.ExclusiveReaderLock == erLock) {
return new[] { item };
}
item = item.Next;
}
return new[] { item };
}
