[Mono-devel-list] Re: Assembly Unloading

[Zoltan Varga]

                                           Hi,

  Unfortunately, assembly unloading is not tested at all when run from an 
embedding app. Same goes for calling mono_domain_set (). If you run into
problems with them (like this one), please report it at bugzilla.ximian.com.

                       Zoltan

On 5/26/05, Jim Purbrick <jimpurbrick at yahoo.co.uk> wrote:
> Hi Zoltan,
> 
> > Appdomains should be unloaded using
> > mono_domain_unload (), not
> > mono_domain_free ().
> 
> mono_domain_unload() only seems to be declared and
> defined within appdomain.c, is there any reason for
> this, or could it be declared in appdomain.h so I can
> call it?
> 
> When I removed all the calls to mono_domain_free the
> application ran fine, just as when I was running it
> with a single appdomain (but obviously not unloading
> anything). So, the calls to mono_domain_free seem to
> be the problem.
> 
> > The current domain of the
> > current thread can be set
> > using mono_domain_set ().
> 
> When I try calling mono_domain_set () immediately
> after creating the new domains with mono_domain_create
> (), I get a crash the first time I try to save a
> thread to disk. Is this becuase I need to set the new
> domains up somehow? Is this because it's looking for
> types in the new domain when it serializes and can't
> find them? Am I right in thinking the current domain
> is used to load assemblues when deserializing objects?
> What else is the current domain used for?
> 
> Cheers,
> 
> Jim.
> 
> The call stack I get when trying to serialize the
> thread after calling mono_domain_set is shown below.
> 
> System.NullReferenceException: Object reference not
> set to an instance of an obj
> ect
> in <0x0023d>
> System.Runtime.Serialization.Formatters.Binary.CodeGenerator:Genera
> teMetadataType (System.Type type, StreamingContext
> context)
> in <0x00037>
> System.Runtime.Serialization.Formatters.Binary.ObjectWriter:CreateM
> emberTypeMetadata (System.Type type)
> in <0x00587>
> System.Runtime.Serialization.Formatters.Binary.ObjectWriter:GetObje
> ctData (System.Object obj,
> System.Runtime.Serialization.Formatters.Binary.TypeMe
> tadata metadata, System.Object data)
> in <0x0003f>
> System.Runtime.Serialization.Formatters.Binary.ObjectWriter:WriteOb
> ject (System.IO.BinaryWriter writer, Int64 id,
> System.Object obj)
> in <0x0014d>
> System.Runtime.Serialization.Formatters.Binary.ObjectWriter:WriteOb
> jectInstance (System.IO.BinaryWriter writer,
> System.Object obj, Boolean isValueO
> bject)
> in <0x00039>
> System.Runtime.Serialization.Formatters.Binary.ObjectWriter:WriteQu
> euedObjects (System.IO.BinaryWriter writer)
> in <0x00049>
> System.Runtime.Serialization.Formatters.Binary.ObjectWriter:WriteOb
> jectGraph (System.IO.BinaryWriter writer,
> System.Object obj, System.Runtime.Remo
> ting.Messaging.Header[] headers)
> in <0x002ce>
> System.Runtime.Serialization.Formatters.Binary.BinaryFormatter:Seri
> alize (System.IO.Stream serializationStream,
> System.Object graph, System.Runtime
> .Remoting.Messaging.Header[] headers)
> in <0x00015>
> System.Runtime.Serialization.Formatters.Binary.BinaryFormatter:Seri
> alize (System.IO.Stream serializationStream,
> System.Object graph)
> in <0x000b5> UThread.UThread:Save (System.String filename)
> 
> 
> 
> 
> 
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