Hi,
I have a non-reentrant plperlu function, which does no database modification. It basically stores input data into a
file,calls a unix shell command, and reads the result back from another file.
I don't really care about database isolation here, phantom reads and such. It is not likely to be a problem. What could
bea problem, is if another call to this function is fired while another one is running.
In this specific case, I could solve the problem by generating random input and ouput filenames, but I would prefer a
moregeneral solution, like using some sort of mutex for the function. What is the best way to do that under Postgresql?
Althoughnot designed for this (if I understand correctly), would a "serializable" isolation level help here?
Best regards!
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