Pause on console in libmisc/shell detecting terminal size (mvme5500, beatnik)

[zhengxiaojun]

在 2024/1/5 4:25, Peter Dufault 写道:
> I guess maybe the list went down for a while.  I sent this on 12-30, and just got a bounce message today and  no "devel" mail until today.
> 
> On master when I type a shell command at the console there is a pause, rough timing:
> 
> - Three second pause after hitting return;
> - "0q" shows up on the console;
> - Three second pause again, then the command is executed.
> 
> This doesn't happen on a telnet session.  It is this commit:
> 
> commit 8425e679c149096a5d0a97990f6ebdbdd55ca522
> Author: Chris Johns <chrisj at rtems.org>
> Date:   Tue Nov 22 21:05:48 2022 +1100
> 
>     libmisc/shell: Support terminal size as env variables
> 
>     Closes #4763
> 
> Which has this:
> 
>   fputs("\033[>0q", stdout);
> 
> I backed it out for now.  Anyone else seeing this?
> 
I have the same issue, I stared a discussion on discord, but no further 
information.

Commit 7260887fa989c0141e7265cd851e00b4101410d8 "Work around tmux bug in 
row and column" introduced 150ms timeout(usleep(1000) 150 times). I 
tested On my board, the exact delay is about 300ms.  Timeout (in process 
shell command) will be called 3times, so the whole delay is about 1s.

So maybe 150ms seems a bit long.

But I found usleep() always sleep 1 more millisecond. usleep(1000) 
actual delay is about 2000us, usleep(1000000) actual delay is about 
1001000us. rtems_task_wake_after() is exact.

> Peter
> -----------------
> Peter Dufault
> HD Associates, Inc.      Software and System Engineering
> 
> 
> 
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