Hi,
I've just subscribed this mailing list since I really need your help to
better understand how to use Axis2/C in a multi-thread environment.
I only use the client side, and server side services are disabled in
axis2.xml.
I think there must be something I ignore about memory management and
threading support.
My web service client runs fine in a single-thread helloworld, but
crashes ALL THE TIME if I run a multi-thread software. In particular, I
believe I'm using Axis2's environments, allocator, and error structures
in an incorrect way, that's why I'm asking for more info. Just to know
the correct way of using _create, _free, AXIS2_FREE an so on, if solves
my problem.
Is it right to create an environment in each thread? Or should I create
a single environment and then create svc_clients in each thread? Or
create everything in the root thread and then invoke the svc_clients
from different threads?
I really did a lot of test: shared / not shared error_t structures, a
custom allocator with functions protected by a shared mutex, single
environment, many environments, but the results are always the same:
continuous random crashes in different points. After studying the
problem for 2 days, I've discovered malloc, realloc and free, of both
the custom and default allocator, sometimes fail returning null. So I
have null pointer exceptions everywhere randomly!
And I'm not doing anything special! I've setup 3 svc_clients in each
thread, 10 threads, without executing anything else, without even
calling the services! I can't imagine what happens if I execute the
send_receive!
I really don't know what to think. I defined a custom allocator, shared
among all the environments, with functions protected by a mutex.
malloc/free crashes were solved, but now I have readdir and other
function crashing all the time (crashing means int 3, user exception and
heap corruption), continuously and randomly.
Libxml2 is initialized by the main thread, as specified in libxml2's
documentation about multi-threading support.
I'm working with Win2003 x86, VC6 and the multi-thread debug dll C
runtime MSVCRTD.dll.
I run on a Core2 Duo, maybe it's too much multi-threading :-)
Thanks a lot if you can help me or suggest what to do next.
I have tons of info since I've studied Axis2 source very deeply.
If you want to know something more, just ask.
Cheers,
Stefano
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