Could there be some mistake in the copying of the code? I tested my code and it works (both versions). Here is my complete sample code. Be sure to use the download button underneath before you copy/paste the code so you don't copy word wrapped lines. And remember that for the code with the push you also need to remove the closing '}' of the loop.
#!/usr/bin/perl
use warnings;
%threads=('a', [1,2,3],
'b', [2,2,3],
'e', [3,2,3],
'd', [4,2,3],
'c', [5,2,3]);
$tnum=0;
foreach $thread (keys %threads) {
print "\n thread for $thread, tnum=$tnum:"; #dbg
print "\n\tthe array from hash=@{$threads{$thread}}"; #dbg
# THE ABOVE LINE CORRECTLY PRINTS THE ELEMENTS OF THE ARRAY OF THE HAS
$tsub[$tnum] = $thread;
$tsize[$tnum] = @{$threads{$thread}};
print "\n\ttsize[tnum]= $tsize[$tnum]"; #dbg
# for ($i=0; $i<$tsize[$tnum] ; $i++)
# { $tlist[$tnum][$i] = $threads{$thread}[$i];
push( @{$tlist[$tnum]}, @{$threads{$thread}} );
# HERE I'M TRYING TO PRINT THE ELEMENTS ONE AT A TIME
print "\n\t\@{threads{thread}}=@{$threads{$thread}}";
# BUT THE ABOVE LINE PRINTS ONLY A NULL
}
which gives me the following output (note that as LanX found out you don't increment tnum, so there is still a bug in this code):
Name "main::tsub" used only once: possible typo at ./t7.pl line 17.
Name "main::tlist" used only once: possible typo at ./t7.pl line 22.
thread for e, tnum=0:
the array from hash=3 2 3
tsize[tnum]= 3
{threads{thread[0]}}=3 2 3
thread for c, tnum=0:
the array from hash=5 2 3
tsize[tnum]= 3
{threads{thread[0]}}=5 2 3
thread for a, tnum=0:
the array from hash=1 2 3
tsize[tnum]= 3
{threads{thread[0]}}=1 2 3
thread for b, tnum=0:
the array from hash=2 2 3
tsize[tnum]= 3
{threads{thread[0]}}=2 2 3
thread for d, tnum=0:
the array from hash=4 2 3
tsize[tnum]= 3
{threads{thread[0]}}=4 2 3
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