Jonathan:
My brother, who is a much more experienced programmer than myself,
gave me a
long explanation about collisions, that can occur in the following
order of
events:
1) User A reads the file, and determines it is not owned
2) In the few milliseconds between when User A reads the file, and
resaves
it, user B reads the file and also reads that it is not owned.
3) User A makes changes and saves the data
4) User B, who should have been locked out but was not, makes changes
and
saves his data, overwriting the changes made by User A.
Absolutely! That's why between steps 2 and 3 each user must reread the
file to confirm she/he has acquired access.
Rob Cozens
CCW, Serendipity Software Company
"And I, which was two fooles, do so grow three;
Who are a little wise, the best fooles bee."
from "The Triple Foole" by John Donne (1572-1631)
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