How can I using tpcall from one service to another service in the same server

When I using tpforward between two services in one server, it's working ok. However,
when I using tpcall from one service to another service, it's failed?
anybody can tell me why?
thanks
george

"george" <[email protected]> wrote:
>
When I using tpforward between two services in one server, it's working
ok. However,
when I using tpcall from one service to another service, it's failed?
anybody can tell me why?Basically, tpcall:ing another service in the same server is a no-no, unless you
a) are running a multi-threaded server (requires TUXEDO 7 or newer + compilation
options) or
b) use tpacall() instead of tpcall() and specify the flag TPNOREPLY. This is probably
not what you want to accomplish, though.
The reason is that TUXEDO servers by default (and always in versions before 7)
are single-threaded. If service A and B both reside in server X, server X will
be busy taking care of the call to A. If A makes a call to B, the call will be
put on the queue to X, but X will not look at the queue until it is done with
A, which won't happen until B returns... deadlock!
You can play tricks with starting multiple instances of X, but in the end you
will always face a risk (something lika a race-condition) for a dead-lock.
Solution: Move service B to another server (usually quite easy) OR switch to multi-threading,
if that's possible. Just make sure all code your service calls is MT-safe as well...
thanks
georgeHope this helps you,
/Per

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