Databases
StackOverflow2013
Postsdbo
POPerl Threads - Capture Exit
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POPerl Threads - Capture Exit
    primarykey
    data
    text
    <p>I have code that spawns two threads. The first is a system command which launches an application. The second monitors the program. I'm new to perl threads so I have a few questions...</p> <pre><code>my $thr1 = threads-&gt;new(system($cmd)); sleep(FIVEMINUTES); my $thr2 = threads-&gt;new(\&amp;check); my $rth1 = $thr1-&gt;join(); my $rth2 = $thr2-&gt;join(); </code></pre> <p>1) Do I need a second thread to monitor the program? You can think of my sub routine call to &amp;check as a infinite while loop which checks a text file for stuff the application produces. Could I just do this:</p> <pre><code>my $thr1 = threads-&gt;new(system($cmd)); sleep(FIVEMINUTES); &amp;check; </code></pre> <p>2) I'm trying to figure out what my parent is doing after I run this code. So after I launch line 1 it will spawn that new thread, sleep, then spawn that second thread and then sit at that first join and wait. It will not execute the rest of my code until it joins at that first join. Is this correct or am I wrong? If I am wrong, then how does it work?</p> <p>3) My first thread the one that launches the application can be killed unexpectedly. when this happens, I have nothing to catch that and kill the threads. It just says: "Thread 1 terminated abnormally: Undefined subroutine &amp;main::65280 called at myScript.pl line 109." and then hangs there.</p> <p>What could I do to get it to end the other threads? I need it to send an email before the program ends as well which I can do by just calling &amp;email (another subroutine I made).</p> <p>Thanks</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USpilcrow
    1. USRyan
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POPerl Threads - Capture Exit
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POPerl Threads - Capture Exit
      1. This table or related slice is empty.
      1. VTUpMod
    1. COWhen `threads->create` isn't given a code reference, but a scalar/string, it will use that string as a subroutine name. When the `system` command exits, it returns an error code. Your problem stems from using this error code (`65280`) as a subroutine name. You need to enclose it in a sub, as ikegami showed in his answer.
      singulars
      1. POPerl Threads - Capture Exit
      1. USamon
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload