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From: rogers%albany.csnet@CSNET-RELAY.ARPA (Prof. Alan Rogers)
Newsgroups: net.unix
Subject: file system query
Message-ID: <10195@brl-tgr.ARPA>
Date: Thu, 25-Apr-85 08:02:19 EST
Article-I.D.: brl-tgr.10195
Posted: Thu Apr 25 08:02:19 1985
Date-Received: Sat, 27-Apr-85 01:31:38 EST
Sender: news@brl-tgr.ARPA
Lines: 11

>	 UNIX 4.2 allows files to be opened in append mode. I would 
>	 like to know if this is "Atomic Append". 
>
>	 For example, if two programs open the same file in append mode,
>	 and append few blocks to the file then is it true that the blocks
>         will be appended in order (that is first all the blocks of first 
>         program followed by the blocks of the second program, or vice-versa).
   The other day I had two processes appending to the same file by mistake
(BDS4.2).  The first process wrote a few lines, and then these were
overwritten by the the second process.  When both were finished, the output
of the first process had disappeared.