[PD-dev] pd external memory weirdness

Hi I don't know if this the right place to post a question/plea for help but,

I'm trying to write an external, that uses a pthread to do some speech synthesis without interrupting pd audio.

I'm getting a very strange problem.. its leaking memory when invoked within the thread.

After further investigation, I find that even a simple malloc/free is leaking all the memory it's allocating, even when called in the main pd thread, if there is another thread being created- its as if the act of making a new thread completely confuses malloc.

Any thoughts, would this be something to do with pd or with the c library (glibc/ubuntu)?

Thanks

Tim