Gil, I wonder if said "observant user" would notice a file name which started with a period, followed by the characters "newversion-of', another period, then the original file name?
E.g. PUT updated-file .newversion-of.static-name RENAME .newversion-of.static-name static-name On Fri, Oct 25, 2013 at 9:05 AM, Paul Gilmartin <[email protected]>wrote: > On Thu, 24 Oct 2013 21:25:50 -0700, Phil Smith wrote: > > > >But the data is also shared across tasks, so we don't want a window where > it's half-written and some task tries to read it. > > > UNIX files provide the natural solution to such a requirement > in that the UNIX rename() is preemptive and atomic: > > o Preemptive in that rename() replaces any previously existing > file (directory entry, actually) having the new name. > > o Atomic in that the operation is serialized by the kernel so > that no other process doing a search for the file can encounter > a window during which the file is not found. > > There ought to be a Requirement to provide a similar facility > in IDCAMS. PDSE does very similarly for PDSE members. > Can you use PDSE members? > > I regularly make use of this using FTP, actually, to install > updated versions of certain files: > > PUT updated-file tempname > RENAME tempname static-name > > A couple times an observant user has spotted the tempname > file while the operation was progress and asked me to > explain its existence. But he never had to deal with an > incomplete file. > > -- gil > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > -- This is clearly another case of too many mad scientists, and not enough hunchbacks. Maranatha! <>< John McKown ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
