There is a compiled in limit of 100 threads in Win32 - I ran into this a
few weeks back.  Please see this thread.

http://www.perlmonks.org/index.pl?node_id=373409

--mikej

>  -----Original Message-----
>  From: perl-win32-users-bounces@[...].com
>  [mailto:perl-win32-users-bounces@[...].com] On
>  Behalf Of John Deighan
>  Sent: Friday, July 30, 2004 9:09 AM
>  To: perl-win32-users@[...].com
>  Subject: Re: Perl threads crash perl
> 
> 
>  Seeing as noone else has responded to this, let me simply say
>  that I tried
>  to develop an application using Perl threads, and in my opinion, Perl
>  threads are seriously broken. We had to re-write the
>  application without
>  threads.
> 
>  The main problem was that threads would die, but I found no
>  reliable way of
>  detecting this. Also, some advice I found on the web said that you
>  shouldn't create too many threads - they weren't designed for that.
>  However, there was no mention of what the limit might be, how
>  to determine
>  the limit, or how to discover whether thread creation
>  succeeded or failed.
>  All this means that if you want to create a couple of
>  threads, it should
>  (?) work, but beyond that, who knows?
> 
>  At 04:07 PM 7/29/2004, Nadjaf Kuliev wrote:
>  >When i tested my IIS vulnerability checker, it works
>  perfecly, but when I
>  >added multitasking support, it starts good, bit by bit cpu
>  noise increases
>  >then perl crases with unknown error. I didnt use fork(). I
>  used builtin
>  >Threads support with async{}. I dont want to make the code
>  public before
>  >first release so ill tell some details, if it wont help i
>  will email some of
>  >you who really wants to help the code. So here it is, the
>  main scripts gets
>  >all the vulnerability check, ie vulnerable file checks from
>  a file and tries
>  >them one by one on particular IIS webserver. Ony by one is
>  really slow, so I
>  >implemented threads. As you may know if it is checking the
>  webserver it
>  >surely will send HTTP requests for each vulnerable file. I
>  use IO::Socket
>  >only, not HTTP support modules.
>  >
>  >As far as i can guess, the reason for crash is most probably
>  not in the code
>  >  but in the perl, perl threads support particularly and how
>  interacts with
>  >my OS - windows 98.
>  >
>  >Any help is greatly appreciated. Thanks in advance.
>  >
>  >Respect, OkIDaN.
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