Tuxedo Version Interoperability

Question

I need to call Tuxedo services from an existing multithreaded application. In
looking at the Tuxedo documentation, it appears that Release 7.1 is the first
release that is threadsafe, so my application will need to use version 7.1. However,
the Tuxedo services I need to call are running in a release 6.5 environment.
The documentation for 7.1 states that a 7.1 Workstation client is interoperable
with pre 7.1 versions in the following situations.
1) The client is neither multithreaded or multicontexted.
2) The client is multicontexted.
3) The client is multithreaded and each thread is in a different context.
It then states that a 7.1 Workstation client with multiple threads in a single
context cannot interoperate with pre 7.1 Tuxedo.
Here is where I become confused. A multithreaded client must call tpinit with
the TPMULTICONTEXTS flag set. I understand this to mean that I'm a multicontexted
client, which according to reason # 2 means I'm interoperable with pre 7.1 servers.
However, a context is defined as a connection to a domain, and I'll only have
one connection with the server. Does this mean I'm running in single-context
mode, and since I'm a multithreaded app, I'm not interoperable with pre 7.1 servers?
Does anyone know if I can talk to 6.5 servers in this situation? Thanks in advance
for any replies.

Answer 1

Hello Curt,
I have written a multithreaded /WS client using Tuxedo 8.0 that calls a 6.5 server
application, so it's clearly doable... anyway, here's my $0.02 regarding this
subject:
First of all I think you should go for Tuxedo 8.x instead of 7.1.
Secondly, I think the point is not really which version you run on the server
but rather how you code your client. You simply need to keep track of your threads
and context[s] and make sure that no more than one thrad uses a certain context
at any one time. As long as you do that, I think you would do just fine.
Now what you MUST do in order to connect to an older (<7.1) server is to setup
the environment variable
WSINTOPPRE71=yes
on your client.
This has nothing to do with threading, it is due to the big changes in the security
model that was introduced in 7.1 (as opposed to earlier versions).
Hope this helps,
/Per
"Curt Hixson" <[email protected]> wrote:
>
I need to call Tuxedo services from an existing multithreaded application.
In
looking at the Tuxedo documentation, it appears that Release 7.1 is the
first
release that is threadsafe, so my application will need to use version
7.1. However,
the Tuxedo services I need to call are running in a release 6.5 environment.
The documentation for 7.1 states that a 7.1 Workstation client is interoperable
with pre 7.1 versions in the following situations.
1) The client is neither multithreaded or multicontexted.
2) The client is multicontexted.
3) The client is multithreaded and each thread is in a different context.
It then states that a 7.1 Workstation client with multiple threads in
a single
context cannot interoperate with pre 7.1 Tuxedo.
Here is where I become confused. A multithreaded client must call tpinit
with
the TPMULTICONTEXTS flag set. I understand this to mean that I'm a multicontexted
client, which according to reason # 2 means I'm interoperable with pre
7.1 servers.
However, a context is defined as a connection to a domain, and I'll only
have
one connection with the server. Does this mean I'm running in single-context
mode, and since I'm a multithreaded app, I'm not interoperable with pre
7.1 servers?
Does anyone know if I can talk to 6.5 servers in this situation? Thanks
in advance
for any replies.