=== ----- Original Message ----- From: "Michael Haubenwallner" <[EMAIL PROTECTED]> > - It is not clear what happens in following circumstance: > 1) the first process creates a shm > 2) a second one attaches to it > 3) now the second process dies without detaching > 4) the first process removes the shm with shmctl(IPC_RMID), > but the ipc-daemon was sleeping and did not remove the > second attachment-entry early enough to have shm_nattch==0, > which must be the case in shmctl() to really remove the shm > by the caller of shmctl(IPC_RMID). > > What IMHO surely not should happen is that a shmid with > shm_nattch==0 remains with having the destroy-flag set. > So the ipc-daemon must remove a shm in this state, > including the tmp-file.
In this case, the daemon should wait on all the processes that are attached, so it gets woken up when a process quits. Alternatively, you could queue the removal, prevent now attachments, and when the second process termination is 'noticed' perform the removal. Rob -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Bug reporting: http://cygwin.com/bugs.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
