RE: threads in perl

[Igor Ryaboy]

Not Exactly,
I'll be more specific:
I need to open a lot of threads with same name when passing different parameters to 
each. When inside each thread there is a system call which can take a lot of time. I 
want that after the system call ends the thread will close itself and remove itself 
from threads->list. For example:


while(...) #here will be some condition concerned with currently running threads i.e 
threads->list 
    $thr=new threads \&create_thread, $param; 
    $param=$param+1;

sub create_thread {
    print("\nNew thread was started\n");
    my @create_param = @_;
    system("...");
    print ("\nOld thread was finished\n");
}

Unfortunately this construction didn't worked because the threads->list didn't 
decremented by itself after the system call was finished?
What should I do? Maybe use of "join" in some way? 

THANKS A LOT
Igor


-----Original Message-----
From: zentara [mailto:[EMAIL PROTECTED]
Sent: Friday, October 10, 2003 7:44 PM
To: [EMAIL PROTECTED]
Subject: Re: threads in perl


On Wed, 8 Oct 2003 13:13:13 +0200, [EMAIL PROTECTED] (Igor
Ryaboy) wrote:

>Hi,
>I need help in simple threaded solution.
>How can I join the active thread?
>
>After I was started the thread I want him to join itself at the end and go back to 
>the main
>Example:
>
># main program
>$thr1=new threads \&sub_name;
>$thr2=new threads \&sub_name;
>$thr3=new threads \&sub_name;
>$thr4=new threads \&sub_name;
>
># threaded subroutine
>sub sub_name{
>    print ("\nIn the thread!\n");
>    # here I need help to join this thread after the   print
>
>}
>
>I need that every started thread will be killed after finished and thread->list to be 
>updated

Is this what you are thinking?

#!/usr/bin/perl
use threads;
# join() does three things: it waits for a thread to exit,
# cleans up after it, and returns any data the thread may
# have produced. 

$thr1 = threads->new(\&sub1);
$ReturnData1 = $thr1->join;
print "Thread1 returned @$ReturnData1\n";

$thr2 = threads->new(\&sub2);
$ReturnData2 = $thr2->join;
print "Thread2 returned @$ReturnData2\n";

$thr3 = threads->new(\&sub3);
$ReturnData3 = $thr3->join;
print "Thread3 returned @$ReturnData3\n";

sub sub1 {
@values = ('1a','1b', '1c');
return [EMAIL PROTECTED]; 
}

sub sub2 {
@values = ('2a','2b', '2c');
return [EMAIL PROTECTED]; 
}

sub sub3 {
@values = ('3a','3b', '3c');
return [EMAIL PROTECTED]; 
}
__END__


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