On Tue, Apr 14, 2015 at 11:08 PM, Steven D'Aprano <steve+comp.lang.pyt...@pearwood.info> wrote: > On Tue, 14 Apr 2015 05:58 pm, Fabien wrote: > >> On 14.04.2015 06:05, Chris Angelico wrote: >>> Not sure what you mean, here. Any given file will be written by >>> exactly one process? No possible problem. Multiprocessing within one >>> application doesn't change that. >> >> yes that's what I meant. Thanks! > > It's not that simple though. If you require files to be written in precisely > a certain order, then parallel processing requires synchronisation. > > Suppose you write A, then B, then C, then D, each in it's own process (or > thread). So the B process has to wait for A to finish, the C process has to > wait for B to finish, and so on. Otherwise you could find yourself with C > reading the data from B before B is finished writing it.
Sure, which is a matter of writer/reader conflicts on a single file - nothing to do with "writing multiple files simultaneously" which was the question raised. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
