On Feb 14, 6:48 am, James Reeves <weavejes...@googlemail.com> wrote: > I've been having some difficulty coming up with a scheme for writing > to files in a thread-safe manner. The files are named with the hash of > their content, so they are effectively immutable. > > The problem comes with writing them for the first time. I need to > ensure that while a file is initially being written, no other thread > attempts to read or write to the file. > > The best solution I've come up with so far is to write to a temporary > file, then rename the file to its hash once it has been closed. This > seems to work, but I'd be very interested to know how other people > have handled similar concurrent I/O problems in Clojure.
I've encountered this problem before when programming in other languages. I much prefer the temporary file approach; it works nicely like a transaction, so you can abort the operation without messing up any files in your working directory. POSIX I/O supports (via the mkstemp() call) generating a unique temporary file which is opened in a single filesystem-atomic operation, so you can ensure that no other thread opens a temporary file with that name. Does Java have a similar facility? mfh --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~----------~----~----~----~------~----~------~--~---
