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 be a 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 more general solution, like using some sort of mutex for the function. What is the best way to do that under Postgresql? Although not designed for this (if I understand correctly), would a "serializable" isolation level help here? Best regards! ------------------------------------------------------------- Attik System web : http://www.attiksystem.ch Philippe Lang phone: +41 26 422 13 75 rte de la Fonderie 2 gsm : +41 79 351 49 94 1700 Fribourg pgp : http://keyserver.pgp.com
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