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The extremely simple buffering tutorial (really just an example)

by tphyahoo (Vicar)
on Jul 21, 2005 at 09:04 UTC ( #476757=perltutorial: print w/ replies, xml ) Need Help??

Only for novice monks too lazy to read dominus's suffering from buffering:

from perlvar:

HANDLE->autoflush(EXPR) $OUTPUT_AUTOFLUSH # need to use English at the start of your module $| If set to nonzero, forces a flush right away and after every write + or print on the currently selected output channel. Default is 0 (reg +ardless of whether the channel is really buffered by the system or no +t; $| tells you only whether you've asked Perl explicitly to flush af +ter each write). STDOUT will typically be line buffered if output is +to the terminal and block buffered otherwise. Setting this variable i +s useful primarily when you are outputting to a pipe or socket, such +as when you are running a Perl program under rsh and want to see the +output as it's happening. This has no effect on input buffering. See +getc in the perlfunc manpage for that. (Mnemonic: when you want your +pipes to be piping hot.)
Some simple code:
#see also http://perl.plover.com/FAQs/Buffering.html use strict; use warnings; #prints, waits a second, prints for (1..3) { sleep 1; print "$_\n"; } #without the newline, waits the entire time and then prints the whole +thing. for (1..3) { sleep 1; print "$_"; } $| = 1; #now it works for (1..3) { sleep 1; print "$_"; } #you might want to go back to the default behavior now. $| = 0;

Considered (dvergin): Author requests this be listed on Tutorials page. What say you all?
Unconsidered (holli): Enough Keep Votes (Keep/Edit/Delete: 20/21/1)

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