ree,
Amazing. Yesterday in the CB, I was asking about options of limiting the scope of unsafe signals. When prompted "why would you want to do that?", I indicated that I was trying to get an exclusive lock on a table using DBD::DB2 but instead of failing instantly it was going into a lock-wait state. After discovering alarm didn't work as desired with safe signals, I tested and found unsafe signals to work. It turns out there is a way to limit how long you are willing to wait for a lock at the session level. The setting is not exposed through DBD::DB2 but rather is done using $dbh->do($statement).

It was pointed out to me by Corion as it has been to you here that this is likely because the DB driver is also using alarm to handle the built-in time out. Assuming we are right, you have two options. The first is to use unsafe signals. The second is to discover how to time out your connection natively and trap it in a eval as I did.

Cheers - L~R

In reply to Re: Capture alarm signal by Limbic~Region
in thread Capture alarm signal by vinoth.ree

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


  • 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, details, 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, summary, 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.