lkml.org 
[lkml]   [2008]   [Oct]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 0/2] SIGWINCH problem with terminal apps still alive
> I've read the code. The race problem with xterm or other pty using

Clearly not.

> program in 2.6.26 appeared because one app called ioctl(TIOCSWINSZ) on
> the master side while other read winsize (TIOCGWINSZ) using client side
> (slave). So in one ioctl() call tty == master and in other tty ==
> real_tty. Of course we can have the opposite situaction so terminal app

Then we end up with both using real_tty.

> Anyway I think that you miss the point. Why using
> real_tty->termios_mutex instead of tty->termios_mutex in tty_do_resize

To avoid deadlocks if you took both as you updated both structures.

> So it seems that tty->termios_mutex could point to different
> location in different calls but real_tty->termios_mutex always points
> to the same location.

You've finally got there - we always work off real_tty. That is why we
can safely use the mutex on the real_tty side.

Alan


\
 
 \ /
  Last update: 2008-10-12 20:07    [W:0.038 / U:1.332 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site