// A useful utility but it's completely fine to create your own write lock under an upgradable one.
public void UpgradeToWriteLock(int?millisecondsTimeout = null)
{
if (!LockHeld)
{
throw new InvalidOperationException("Cannot upgrade a lock when the lock was not held.");
}
lock (_sync)
{
if (_upgraded != null)
{
throw new InvalidOperationException("A write lock is already in effect.");
}
_upgraded = new WriteLock(_target, millisecondsTimeout);
}
}
public void Downgrade()
{
if (!LockHeld)
{
throw new InvalidOperationException("Cannot upgrade a lock when the lock was not held.");
}
lock (_sync)
{
if (_upgraded == null)
{
throw new InvalidOperationException("There is no write lock in effect to downgrade from.");
}
_upgraded.Dispose();
_upgraded = null;
}
}