/// <summary>
/// Lock a ref.
/// </summary>
/// <param name="r">The ref to lock.</param>
/// <returns>The current value of the ref.</returns>
object Lock(Ref r)
{
bool unlocked = false;
try
{
r.EnterWriteLock();
if (r.CurrentValPoint() > _readPoint)
throw _retryex;
Info refinfo = r.TInfo;
// write lock conflict
if (refinfo != null && refinfo != _info && refinfo.IsRunning)
{
if (!barge(refinfo))
{
r.ExitWriteLock();
unlocked = true;
// stop prior to blocking
stop(RETRY);
lock (refinfo)
{
if (refinfo.IsRunning)
{
try
{
Monitor.Wait(refinfo, LOCK_WAIT_MSECS);
}
catch (ThreadInterruptedException)
{
}
}
}
throw _retryex;
}
}
r.TInfo = _info;
return r.TryGetVal();
}
finally
{
if (!unlocked)
{
r.ExitWriteLock();
}
}
}