if i need to create a counter for a web page, how do i ensure that there
will be no other process that try to access the couter file at the same time
for updating the value in the file? i.e. how do i lock the file for
exclusive writing?
but if i'm able to lock the file, then how can i effectively update the
counter, say there are ten people accessing the web page at the same time?
pls advice, thank a lot!
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