And the exact .bat script for looping the test ...

Um. Not quite. 

c:\test>555304

c:\test>LOOP:
'LOOP:' is not recognized as an internal or external comm
operable program or batch file.

c:\test>perl 555304.pl
Thread 1
Thread 2
Thread 3



Thread 4

Via system:
hello
world

Via system:
hello
world

Via system:
hello
world

Via system:
hello
world

Via backticks
hello
world

Via backticks
hello
world

Via backticks
hello
world

Via backticks
hello
world

Via pipe
hello
world

Via pipe
hello
world

Via pipe
hello
world

Via pipe
hello
world


c:\test>goto LOOP
The system cannot find the batch label specified - LOOP

[download]

The syntax should be (note the placement of the colon ':' in the first line): 

:LOOP
perl 555304.pl
goto LOOP

[download]

However, having corrected that, I did manage to reproduce the hang. I don't know the cause, but at least I have something to work with. You should probably raise a perlbug so that the p5p guys can see what they can see.

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
Lingua non convalesco, consenesco et abolesco. -- Rule 1 has a caveat! -- Who broke the cabal?
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to Re^9: Behavior of threads on XP-- system() works, backtic & popen don't... by BrowserUk
in thread Behavior of threads on XP-- system() works, backtic & popen don't... by Sync

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