in reply to how to solve producer consumer problem in perl when threads are disabled

The simplest mechanism is a shell pipe.

Producer: perl -e"$|++;for(1..10){ printf qq[%05d\n], $_; sleep 1 }"

Consumer: perl -E"$|++; while(<>){ print; }"

Communications:

>perl -e"$|++;for(1..10){ printf qq[%05d\n], $_; sleep 1 }" | perl -E"
+$|++; while(<>){ print; }"
00001
00002
00003
00004
00005
00006
00007
00008
00009
00010

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