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Re: Re: Understanding how to fork properly.

by dvergin (Monsignor)
on Jan 31, 2002 at 04:07 UTC ( [id://142360]=note: print w/replies, xml ) Need Help??


in reply to Re: Understanding how to fork properly.
in thread Understanding how to fork properly.

if some bonehead set it to -1 previously, the increment op wouldn't be doing the wrong thing.

Oops! No. $| is magic. It always equals either zero or one. Nothing else. Behold: 

print "$|\n";      # 0

$| = -1;
print "$|\n";      # 1

$|++;
print "$|\n";      # 1

$|++;
print "$|\n";      # 1

$|--;
print "$|\n";      # 0

$|--;
print "$|\n";      # 1

$|--;
print "$|\n";      # 0

[download]
As you can see, $|++ always sets $| to one (no matter what it was) and $|-- always toggles it.

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