Hi All, I'm now working on porting our system to the Mac OS X. Everything works well except one strange thing on process's exit and I can't understand where we have gone worng. Application (which is multiprocess in nature) extensively uses shm_open/mmap/munmap system calls to share memory between processes. The problem is that on exit this application hangs (almost absolutely) whole system for a few seconds. Removing of some mmap/munmap calls solves this problem. I don't know what is going on at this moment. I want also to mention that this code works perfectly on FreeBSD/Linux/Windows. Are there any ideas? System is 10.4.11 PPC.