"Possible Lost" blocks when using zloop under zthread

[JustonDavies]

Summary: When utilizing a zloop from within a thread spawned by zthread valgrind claims that some blocks are possibly lost and some are still reachable. The problem only occurs if you start the zloop.

Details:
OS: Debian 6.0.7
Compiler: gcc (Debian 4.4.5-8) 4.4.5
Valgrind: valgrind-3.6.0.SVN-Debian

 CZMQ: 1.4.0
 ZMQ: 3.2.3

 Example: https://gist.github.com/JustonDavies/5265283

Notes: The example isn't exactly the most sensible thing but you should get the fundamental idea. Compile and run using the specified versions using Valgrind with --leak-check=full. If you comment Line 11 you will notice the problem can no longer be produced. Adding pollitems with zloop_poller appears to make the problem worse, but I haven't an example ready to prove it beyond reasonable doubt.

[felipecruz]

can you post valgrind's output?

I wasn't able to reproduce it on OSX..

[JustonDavies]

Requested output can be found here:

https://gist.github.com/JustonDavies/5295700

[felipecruz]

Hi @JustonDavies . Sorry about this long delay..

I found some resources about "leaks" related with pthread_create, which is what ztread_new uses underneath. This controversy is more related with pthread_create than with czmq so I'm closing this.

http://sourceware.org/ml/glibc-bugs/2007-04/msg00036.html
http://www.linuxquestions.org/questions/programming-9/memory-leak-in-pthread-591263/