Path: utzoo!attcan!uunet!lll-winken!lll-tis!ames!mailrus!cornell!batcomputer!itsgw!nyser!cmx!anand
From: anand@cmx.npac.syr.edu (Rangachari Anand)
Newsgroups: comp.sys.encore
Subject: File buffers
Keywords: Buffered file input
Message-ID: <585@cmx.npac.syr.edu>
Date: 2 Aug 88 16:53:35 GMT
Reply-To: anand@cmx.npac.syr.edu (Rangachari Anand)
Distribution: na
Organization: Northeast Parallel Architectures Center, Syracuse NY
Lines: 19


  This is a problem that others have surely faced on multiprocessors
  such as the Multimax. Consider a program which forks a number of 
  child processes each of which need to do I/O from a given file. If the 
  fscanf and fprintf functions are used, the buffering action seems to
  load a block of the file into a buffer which is in the private memory 
  of a process. Then when other processes attempt to read from the
  same file, they load blocks of the file into their respective buffers.
  Thus they cant read the file in the correct sequence.

  I have managed to write my programs in such a way that they always use the
  same process to do all the I/O which is a nuisance. I tried to use
  the setbuff call to use a shared buffer but that did not seem to work.
  Any suggestions?


                                            Thanks
                                           R. Anand
  Internet: anand@amax.npac.syr.edu
  Bitnet:   ranand@sunrise