Im trying to understand why the following code wont run correctly, when Im using pause instead of sleep and WWW::Curl. This code will loop two times only and it will get stuck no matter how long I will wait. This happens in Linux, FreeBSD. Stuck here means, it does not continue the loop, seems stuck in pause ... Same construct, alarm,pause works fine if I dont use WWW::Curl, for other types of work. 
use strict;
use warnings;
use WWW::Curl::Easy;
use POSIX qw(pause);
use Time::HiRes qw(time alarm setitimer sleep ITIMER_REAL);
use Getopt::Std;

###  Process command line args
usage() if defined $ARGV[0] and $ARGV[0] eq "--help";
getopts('hvV') or usage();

# process [interval [count]],
my ( $interval, $loop_max );
if ( defined $ARGV[0] ) {
    $interval = $ARGV[0];
    $loop_max = defined $ARGV[1] ? $ARGV[1] : 2**32;
    usage() if $interval == 0;
}
else {
    $interval = 1;
    $loop_max = 1;
}

###  Variables
my $loop = 0;              # current loop number


# how often do we trigger (seconds)?
my $first_interval = $interval;

# signal handler is empty
$SIG{ALRM} = sub { };

# first value is the initial wait, second is the wait thereafter
setitimer( ITIMER_REAL, $first_interval, $interval );

my $http = WWW::Curl::Easy->new();
if (&WWW::Curl::Easy::version() !~ /ssl|nss/i) {
    die "No SSL support";
}


# Get the results


while (1) {

my $url = "http://kronometrix.org/";
$http->setopt(CURLOPT_URL, $url);
my $retcode = $http->perform();

## Get the results
my $response =  $http->getinfo(CURLINFO_HTTP_CODE);

if ($retcode == 0) { 
    print "Ok, Status: $response\n"; 
} else { print "Error, Status: $response\n"; }

    ### Check for end
    last if ++$loop == $loop_max;

    ### Interval
    pause;
    # sleep $interval; 

}

[download]

and if I replace pause with sleep this works fine. Im using this alarms with timers to trigger certain actions at specific time intervals.

Anyone any ideas why WWW::Curl breaks down on pause or am I using this wrong ?. Many thanks for help.

In reply to WWW::Curl pause conflict by krmx

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