04-24-2008
Your best bet is to have each fork generate and then remove a lockfile of their own upon start and exit. The parent process or some other process can then monitor these for status and run the archive process when all of the lockfiles are gone. Something like while [ -e $lockfdir/$lockfile ] or sleep then check an ls command's $? for 0 would probably work ...
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LEARN ABOUT LINUX
dotlockfile
DOTLOCKFILE(1) Cistron Utilities DOTLOCKFILE(1)
NAME
dotlockfile - Utility to manage lockfiles
SYNOPSIS
/usr/bin/dotlockfile [-l [-r retries] |-u|-t|-c] [-p] [-m|lockfile]
DESCRIPTION
dotlockfile is a command line utility to reliably create, test and remove lockfiles. It creates lockfiles reliably on local and NFS
filesystems, because the crucial steps of testing for a preexisting lockfile and creating it are performed atomically by a single call to
link(2). Manpage lockfile_create(3) describes the used algorithm.
dotlockfile is installed with attribute SETGID mail and thus can also be used to lock and unlock mailboxes even if the mailspool directory
is only writable by group mail.
The name dotlockfile comes from the way mailboxes are locked for updates on a lot of UNIX systems. A lockfile is created with the same
filename as the mailbox but with the string ".lock" appended.
The names dotlock and lockfile were already taken - hence the name dotlockfile :).
OPTIONS
-l Create a lockfile if no preexisting valid lockfile is found, else wait and retry according to option -r. This option is the
default.
A lockfile is treated as valid,
o if it holds the process-id of a running process,
o or if it does not hold any process-id and has been touched less than 5 minutes ago (timestamp is younger than 5 minutes).
-r retries
The number of times dotlockfile retries to acquire the lock if it failed the first time before giving up. The initial sleep after
failing to acquire the lock is 5 seconds. After each retry the sleep intervall is increased incrementally by 5 seconds up to a
maximum sleep of 60 seconds between tries. The default number of retries is 5. To try only once, use "-r 0".
-u Remove a lockfile.
-t Touch an existing lockfile (update the timestamp). Useful for lockfiles on NFS filesystems. For lockfiles on local filesystems the
-p option is preferable.
-c For debugging only: Check for the existence of a valid lockfile.
Note: Testing for a preexisting lockfile and writing of the lockfile must be done by the same "dotlockfile -l" or "dotlockfile -m"
command, else the lockfile creation cannot be reliable.
-p Write the process-id of the calling process into the lockfile. Also when testing for an existing lockfile, check the contents for
the process-id of a running process to verify if the lockfile is still valid. Obviously useful only for lockfiles on local
filesystems.
-m Lock or unlock the current users mailbox. The path to the mailbox is the default system mailspool directory (usually /var/mail)
with the username as gotten from getpwuid() appended. If the environment variable $MAIL is set, that is used instead. Then the
string ".lock" is appended to get the name of the actual lockfile.
lockfile
The lockfile to be created or removed. Must not be specified, if the -m option is in effect.
RETURN VALUE
Zero on success, and non-zero on failure. For the -c option, sucess means that a valid lockfile is already present. When locking (the
default, or with the -l option) dotlockfile returns the same values as the library function lockfile_create(3). Unlocking a non-existant
lockfile is not an error.
NOTES
The lockfile is created exactly as named on the command line. The extension ".lock" is not automatically appended.
This utility is a lot like the lockfile(1) utility included with procmail, and the mutt_dotlock(1) utility included with mutt. However the
command-line arguments differ, and so does the return status. It is believed, that dotlockfile is the most flexible implementation, since
it automatically detects when it needs to use priviliges to lock a mailbox, and does it safely.
The above mentioned lockfile_create(3) manpage is present in the liblockfile-dev package.
BUGS
None known.
SEE ALSO
lockfile_create(3), maillock(3)
AUTHOR
Miquel van Smoorenburg, miquels@cistron.nl
September 8, 2009 DOTLOCKFILE(1)