Hello, I'm trying to figure out why my system calls are being called in parallel. My knowledge of Perl and Linux is fairly basic so I'm having trouble figuring out what's wrong with my code...

foreach(@testarray) { my $returnCode = system("gnome-terminal --window-with-profile= +test -e 'fio $fioconfigs{$_}'"); print "$returnCode = return code"; until ($returnCode == 0) { wait(); } }

I've tried forking the process and using waitpid, I've tried(like the code above tries) waiting until the child process has a return code of 0, I've tried using backticks instead of system, etc. Basically every time I run this code, the system command runs as many tests as I've told it to, all at once. It seems like the child process returns 0 immediately instead of waiting for the program fio to terminate. I'm not sure if this is fio causing an issue, or if something else is going on. Any ideas?


In reply to Simultaneous system calls... by samh785

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.