Re: reference count problem
Merijn Vandenabeele <merijn@something.be> wrote:
Igor Tandetnik schreef:
Merijn Vandenabeele <something@elenet.be> wrote:
I'm trying to create an out-of-process COM server which contains the
interfaces IServer, IGsm and IGsmConnection. I create a
GsmConnection object and than a Server object. Next, I ask the
Server for a Gsm object using my GsmConnection. The server has a
vector<IGsm*> member, where I check if I already gave a Gsm object
for this connection. If I did, I want to re-use my object.
Otherwise, I create a new Gsm, set it's connection, add it to the
vector and hand it over to the client. My Server is a singleton
object (computer-wide since it's an exe-server, right?). Gsm
objects are "normal" objects, and GsmConnections too. The only
problem is, I want to hold a reference to my GsmConnection in my
Gsm object. This means the reference count for my GsmConnection
doesn't get to 0, which implies that my exe doesn't unload.
Why? Aren't GSM objects ever destroyed? I would imagine that, when a
GSM object is destroyed, it would release the reference it holds on
GsmConnection. When they are all destroyed, GsmConnection will be
free to go, too. And while at least one GSM object is still alive,
the server can't shut down anyway.
Well, my server has a vector of GSMs that were handed out.
Non-AddRef'ed, I hope?
Gsm objects
are destroyed by the client, but how can the server know about that,
so the object can be removed from the vector?
GSM object can tell the server to remove itself from the vector, say in
its destructor.
Should a Gsm object
hold an internal reference to server so it can remove itself when its
refcount is zero?
Why not?
--
With best wishes,
Igor Tandetnik
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