[EMAIL PROTECTED] (=?iso-8859-1?q?Dag-Erling_Sm=F8rgrav?=) writes: > Tom Lane <[EMAIL PROTECTED]> writes: >> The check we need is "are there any other processes (still) attached to >> this shmem" and AFAIK that is not available in the mmap API. Do you >> know how to get it?
> You can hack something up with fcntl() locks. If a process has a > shared lock on the shm file, F_GETLK will get you its pid. Then grab > your own shared lock. Seems fairly race-condition-prone: what about recently spawned child processes that haven't yet taken their own locks? If I read the fork() page correctly, a forked child doesn't inherit any file locks. regards, tom lane ---------------------------(end of broadcast)--------------------------- TIP 2: you can get off all lists at once with the unregister command (send "unregister YourEmailAddressHere" to [EMAIL PROTECTED])