I guess I still do not understand the basic objection to flock - does it not do what it claims to? My understanding is that the OS ensures that only one process can lock a file at a time. If process #2 changes a file between the
time that process #1 opens it and locks it, what harm is done? #1 locks it, and then has #2's changes. As long as
all your processes are using flock, I still can't quite
see the problem with the race condition. Could you please explain it again? Thanks.
P.S. I will be out of the country, so may not reply for a
week, but I am interested in this. :)