Beefy Boxes and Bandwidth Generously Provided by pair Networks
No such thing as a small change

Is it always necessary to lock a text file?

( #19715=categorized question: print w/ replies, xml ) Need Help??
Contributed by Anonymous Monk on Jun 24, 2000 at 14:39 UTC
Q&A  > files


I read the same text file from many pages, but only for read. Must the text file always be locked for security?

Answer: Is it always necessary to lock a text file?
contributed by lhoward

If you are only reading a file, you do not need to lock it. Locks are only important when writing to the file is involved.

Answer: Is it always necessary to lock a text file?
contributed by Anonymous Monk

Locking the file is not necessary when reading only, and when writing only if there is a possibility of more than one write happening simultaneously (as in the case of a cgi script or multi-user environment) If you are the only person using your script, or if it is a standalone script that only runs on one machine, locking is not necessary.

Answer: Is it always necessary to lock a text file?
contributed by I0

If the file is being written while you are reading, it may be neccesary to LOCK_SH to avoid reading an inconsistent partial update.

Please (register and) log in if you wish to add an answer

  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?

    What's my password?
    Create A New User
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others making s'mores by the fire in the courtyard of the Monastery: (7)
    As of 2016-05-29 04:02 GMT
    Find Nodes?
      Voting Booth?