On Thu, Dec 19, 2013 at 12:55 PM, Scott Ford <scott_j_f...@yahoo.com> wrote:
> I have a C threading question.. My scenario multiple C threads, posix(on), > who all can call a Cobol "thread" aware program in the threads, with their > own local-storage. My question is "will each thread have storage that will > be separate from each other ?" These called programs have the same variable > names in local-storage . > Yes, according to Ref: http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/igy3pg31/4.4 <quote> *Choosing* *LOCAL-STORAGE* *or* *WORKING-STORAGE:* Because you must code your multithreaded programs as recursive, the persistence of data is that of any recursive program: - Data items in the LOCAL-STORAGE SECTION are automatically allocated for each instance of a program invocation. When a program runs in multiple *threads* simultaneously, each invocation has a separate copy of LOCAL-STORAGE data. - Data items in the WORKING-STORAGE SECTION are allocated once for each program and are thus available in their last-used state to all invocations of the program. For the data that you want to isolate to an individual program invocation instance, define the data in the LOCAL-STORAGE SECTION. In general, this choice is appropriate for working data in *threaded* programs. If you declare data in WORKING-STORAGE and your program changes the contents of the data, you must take one of the following actions: - Structure your application so that you do not access data in WORKING-STORAGE simultaneously from multiple *threads*. - If you do access data simultaneously from separate *threads*, write appropriate serialization code. </quote> > > Scott ford > www.identityforge.com > from my IPAD > > 'Infinite wisdom through infinite means' > > -- 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 lists...@listserv.ua.edu with the message: INFO IBM-MAIN
