From: Bart Schaefer <schaefer@brasslantern.com>
To: zsh-users@sunsite.dk
Subject: Re: coloring STDERR to terminal
Date: Thu, 1 Jul 2004 17:11:08 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.60.0407011645450.16728@toltec.zanshin.com> (raw)
In-Reply-To: <20040701181459.GF2033@ay.vinc17.org>
On Thu, 1 Jul 2004, Vincent Lefevre wrote:
> I don't understand why it will block. The line you gave was:
>
> while read -t -p -k 1; do :; done
Ah. You're right; I had only a half-formed thought, there.
I originally wrote (before sending my message, i.e. during the editing
process) "read -p -k 1" (no loop), implying always read one byte from the
coprocess. But in re-reading I realized that blocks forever when there is
no stderr for the coproc to colorize. So I changed it to the "while"
loop, which would do nothing if the coprocess produced no output, and read
the byte otherwise. But I failed to notice that this also means it does
nothing if the coproc has not written the byte *yet*, which is what you
were pointing out.
So I'm forced to conclude that there really is no way to avoid the race
condition that you originally complained about; my first solution is as
good as it gets. You might get close if you used "read -t 1 ..." to make
the parent shell sleep so the kernel can schedule the coprocess first, but
then you'd have an annoying 1-second delay on almost every prompt. Sorry.
next prev parent reply other threads:[~2004-07-02 0:12 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-27 23:22 Atom 'Smasher'
2004-06-28 0:06 ` ari
2004-06-28 0:36 ` Atom 'Smasher'
2004-06-29 15:43 ` Bart Schaefer
2004-06-29 16:08 ` Vincent Lefevre
2004-06-29 17:14 ` Bart Schaefer
2004-06-30 7:09 ` Vincent Lefevre
2004-06-30 10:52 ` Bart Schaefer
2004-06-30 11:43 ` Vincent Lefevre
2004-06-30 12:01 ` Vincent Lefevre
2004-06-30 16:56 ` Bart Schaefer
2004-07-01 18:14 ` Vincent Lefevre
2004-07-02 0:11 ` Bart Schaefer [this message]
2004-07-02 12:42 ` Vincent Lefevre
2004-07-02 21:32 ` Bart Schaefer
2004-07-20 9:10 ` Atom 'Smasher'
2004-07-20 16:10 ` Bart Schaefer
2004-07-20 19:27 ` Atom 'Smasher'
2004-07-20 21:15 ` Bart Schaefer
2004-07-20 23:30 ` Wayne Davison
2004-07-21 3:15 ` Bart Schaefer
2004-07-21 6:23 ` Wayne Davison
2004-07-21 7:30 ` Bart Schaefer
2004-07-21 13:19 ` Vincent Lefevre
2004-07-30 11:50 ` Andy Spiegl
2004-07-30 23:44 ` Vincent Lefevre
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