[Mono-dev] OracleClient.Oci and GC

Miguel de Icaza miguel at xamarin.com
Thu Aug 21 23:27:47 UTC 2014

Hey Neale,

What makes a short ref suitable to be moved during GC?

I am confused, I thought we wouldn't do that.


On Thu, Aug 21, 2014 at 6:58 PM, Neale Ferguson <NealeFerguson at verizon.net>

> I've been looking at OciDefineHandle and the OciDefineByPos call it uses
> in particular. Currently two of the parameters passed to this call are
> short variables. They are passed as "ref" fields as Oracle uses their
> address to put size and indicator data once the data is fetched. However,
> being defined as short means that they are eligible for being moved during
> garbage collection. Thus if that field is moved between the OciDefineByPos
> call and the fetch of the data then what Oracle is pointing to may no
> longer be variable. I'm thinking it may be better to define these fields as
> IntPtr and allocate them and retrieve their values via Marshal.ReadInt16.
> I'm currently testing these changes and so far I'm not getting the failures
> I had been encountering. If this is a valid analysis then the OciBindxxxx
> calls will also need attention as it uses a ref indp parameter as well -
> these appear to be used in OracleParameter.cs.
> Neale
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