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(tye)Re: open, sleep, & print together cause an error

by tye (Sage)
on Feb 10, 2001 at 04:12 UTC ( #57528=note: print w/replies, xml ) Need Help??


in reply to open, sleep, & print together cause an error

Well, yes, if you are open to sleeping "together" and it ends up in print, well, it can cause more than an "error"... (:

Seriously though, $|++ only makes the currently selected output file handle non-buffering (STDOUT, by default). You can do the Perl4-ish thing (updated slightly to use my):

{ my $selected= select(LOG); $|++; # Unbuffer output to LOG select( $selected ); }

Or you can do:

require IO::Handle; LOG->autoflush(1);

which accomplishes the same thing.

        - tye (but my friends call me "Tye")

Replies are listed 'Best First'.
Re: (tye)Re: open, sleep, & print together cause an error
by zeno (Friar) on Feb 10, 2001 at 04:19 UTC

    tye, you are a smart, smart person. That worked. Here's what I ended up with:

    use strict; use warnings; require IO::Handle; # <--- new open LOG,">foo.log" or die "can't open foo.log: $!"; <b>LOG->autoflush(1);</b> # <--- new while(1) { print LOG (localtime).": something\n"; sleep(5); }

    Thanks a lot for your help, tye. -zeno

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[stevieb]: well, what happens is the Arduino 'listens' for requests r/w, and does the appropriate thing when it's interrupted based on the 'register' address sent in. It's ugly as it was my first attempt, but I've got great new ideas I'm just sitting.
[stevieb]: ...down to implement now. Here's the sketch as it currently sits
[shmem]: well I use I2C and SPI and stuff, but creating a pseudo chip looks to me like lot of indirection and memory clutter... not?
[choroba]: Are you going to use the device soon? Related to your comment about "not having much time to do a lot of coding"...
[stevieb]: sure, but I'm just learning ;) I consider it practice to get a good understanding of what goes on *after* an I2C/SPI request is made
[shmem]: ah ok. Gonna read that. but now....
shmem compiles himself into his template
[stevieb]: this is my RPi:: distribution overall automation build system physical layout. It doesn't encompass all of my RPi dists yet, ...
[stevieb]: ...but I'm getting close. I've been soldering my own PCBs to gain that experience as well, before I have my own manufactured.
[stevieb]: heh, nice *template* ;) 'night shmem!

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