ckchee@dgp.toronto.edu (Chuan Chee) (11/05/90)
I have two problems:
(1) Suppose a cron is currently running. I need to change the
system time. How do I make cron pick up the new time?
(2) Because I don't know the answer to the above question, my
software currently calls a script that does something like:
while there is a cron running
kill cron
start a new cron
Unfortunately there is a bug somewhere that makes it call this
script twice in a row within 1 sec. This is a very intermittent
bug. What happens is that the first script kills the cron and
starts a new one. However this doesn't appear in the process
table ("ps -e") until it has loaded from disk. The second script
doesn't think there is one running so starts a (2nd) cron.
Is there a way to have the system prevent 2 crons from running?
Is there a way to make a cron "resident" so that it doesn't have
to load from disk?