/// <summary> Sets the state of the lock. </summary>
/// <param name="lockObj"> The lock object. </param>
/// <param name="newState"> The new state. </param>
/// <param name="oldState"> The old state. </param>
/// <param name="timeout"> The timeout. </param>
/// <returns> RWLock.State. </returns>
public static RWLock.State SetLockState(this ReaderWriterLock lockObj, RWLock.State newState, RWLock.State?oldState = null,
int?timeout = null)
{
oldState = oldState ?? lockObj.GetLockState();
if (oldState.Value != newState)
{
switch (oldState.Value)
{
case RWLock.State.NoLock:
if (newState == RWLock.State.ReadLock)
{
lockObj.AcquireReaderLock(timeout ?? 90000);
}
else
{
lockObj.AcquireWriterLock(timeout ?? 90000);
}
break;
case RWLock.State.WriteLock:
if (newState == RWLock.State.NoLock)
{
lockObj.ReleaseWriterLock();
}
else
{
lockObj.DowngradeFromWriterLock(ref _lockCookie);
}
break;
default:
if (newState == RWLock.State.NoLock)
{
lockObj.ReleaseReaderLock();
}
else
{
_lockCookie = lockObj.UpgradeToWriterLock(timeout ?? 90000);
}
break;
}
}
return(oldState.Value);
}
