I've got 2 filehandles that run a process each. I need to work with both inputs in the same loop. What process returns output first is unknown but can be distinguished by $_ pattern matching. Sample code doesn't work but sortof demonstrates what I need to do. Proc1 might be silent for 10mins while proc2 is creating output which I need to work on in the loop, or proc1 is creating output that I need to read while proc2 is not producing anything. If both procs are producing output I'd need to make sure I can separate it. 
$SG = open(Proc1,"Program1.exe|");
$FW = open(Proc2,"Program2.exe|");

while (<Proc1>) || <Proc2>) {
   print $_;
}

[download]

In reply to working with 2 inputs by sktron

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.