I posted this problem also in the mango forum. But now i think it is perhaps a phobos problem:

http://www.dsource.org/forums/viewtopic.php?t=1347

I get this assertion:
pthread_mutex_lock.c:108: __pthread_mutex_lock: Assertion
`mutex->__data.__owner == 0' failed.

Can someone help?

Frank
-- 
D goes real-time: http://www.drealtime.com