Beefy Boxes and Bandwidth Generously Provided by pair Networks
Just another Perl shrine
 
PerlMonks  

comment on

( [id://3333]=superdoc: print w/replies, xml ) Need Help??
Which makes it dangerous in the hands of naive users who interrupt a program with CTRL-C, then re-run it. If they do that, they may suffer permanent data loss and without being aware of it.
To quote Oscar Wilde's Miss Prism: "What a lesson for him! I trust he will profit by it." ;-)
It seems to me that you can get re-runnability with little extra effort: simply write the temporary file first and only overwrite the original (via atomic rename) after the temporary has been successfully written.
The IO::Insitu module could certainly be reworked to operate that way. Except that then would fail to preserve the inode of the original file. :-(. Perhaps I will add an option to allow it to work whichever way (i.e. "inode-preserving" vs "rerunnable") the user prefers.

Bear in mind though that an "atomic rename" isn't really atomic under most filesystems, so even this approach still isn't going to absolutely guarantee rerunnability.


In reply to Re^3: Perl Best Practices book: is this one a best practice or a dodgy practice? by TheDamian
in thread Perl Best Practices book: is this one a best practice or a dodgy practice? by eyepopslikeamosquito

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or How to display code and escape characters are good places to start.
Log In?
Username:
Password:

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

How do I use this?Last hourOther CB clients
Other Users?
Others chanting in the Monastery: (6)
As of 2024-03-29 09:53 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found