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The issue you are encountering is that waitpid ($pid,0) is a blocking use POSIX ":sys_wait_h"; # do { $kid = waitpid(-1, WNOHANG); } . Depends on what the calc routine does and how it interacts with the existing program variables to read the 'perlipc' manpage to get the right example to guard against
A non-blocking wait (with WNOHANG in FLAGS) can return 0 if there are child processes the status values of processes that have exited but have not been harvested by the Perl script yet.) See perlipc for details, and for other examples.
7 Jun 2013 You're passing the WNOHANG flag, which makes the call non-blocking. . "bunch up" for this example # not necessary for real code. sleep 2; }
25 Mar 2013 The script also uses “system()” to run processes outside the native Perl like this (for a timeout of 5 seconds, which in this example calles die(), but the $pid = waitpid(-1, WNOHANG); last if ($pid > 0); } if ($pid <= 0) { print
9 Oct 2007 Home > Language reference > Functions > waitpid use POSIX ":sys_wait_h"; # do { $kid = waitpid(-1, WNOHANG); } until $kid > 0; call by remembering the status values of processes that have exited but have not been harvested by the Perl script yet.) See perlipc for details, and for other examples.
17 Jun 2008 Sometimes it can be many months between writing PERL scripts. It can be non-blocking by using “WNOHANG” as the 2nd argument, or it The following example will wait for each child to finish in a blocking way (waitpid
Some Perl functions (piped open s, system , and backticks) will automatically We use the WNOHANG flag to make waitpid immediately return 0 if there are no
use POSIX ":sys_wait_h";; # do {; $kid = waitpid(-1, WNOHANG);; } while $kid > 0; Non-blocking wait is available on machines supporting either the waitpid(2) or wait4(2) system calls. of processes that have exited but have not been harvested by the Perl script yet.) See perlipc for details, and for other examples.
Normally we use wait or waitpid to notice when a child process has finished. calling waitpid() with the process ID of the child process and with the WNOHANG flag the status code is -1 in case of some failure and it is 0 if the child is still running. Example. use strict;; use warnings;; use 5.010;; use POSIX ":sys_wait_h";
Here's some sample code: #Some time later: my $waitpid_retval = POSIX::waitpid($pid, POSIX::WNOHANG); } else { #child #do something
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