[uml-devel] stdin lockup using con0=fd:0,fd:1 (guest 2.4.26-3um)

[uml-devel] stdin lockup using con0=fd:0,fd:1 (guest 2.4.26-3um)

[D. Bahi]

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did i miss the console cleanup crew?

i have a UML guest command line that uses con0=fd:0,fd:1
(or not, as this is the default for CONFIG_CON_ZERO_CHAN)

i launch new xterms using -- xterm -e '<guest cmdline>' &
(side note - can lock it w/o this too.) and users leaning on
the keyboard (most notably <enter>) while the new xterms pop
up and steal the window focus have experienced unresponsive
UML prompts.

no further keyboard input is processed...

uml_mconsole <id> reboot and things can be made better.
so the UML isn't locked up just the stdin....

i've tried to go thru stdio_init -> open_console -> line_open
to see if there was a likely place to drop a 'flush' of stdin
before we try attaching 0 -> 1 and 1 -> 0 (line_setup_irq)...
but i don't understand it all enough <frown>.

this is redhat 9 + SKAS - NPTL 2.4.20-31 host kernel
linux 2.4.26-3um guest kernel.

thank you.

--
db


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Re: [uml-devel] stdin lockup using con0=fd:0,fd:1 (guest 2.4.26-3um)

[Blaisorblade]

On Wednesday 02 March 2005 23:10, D. Bahi wrote:
> did i miss the console cleanup crew?
? Not understood, 2.4 didn't get the big cleanup.
> i have a UML guest command line that uses con0=fd:0,fd:1
> (or not, as this is the default for CONFIG_CON_ZERO_CHAN)
>
> i launch new xterms using -- xterm -e '<guest cmdline>' &
> (side note - can lock it w/o this too.)
Describe the other scenario please...
> and users leaning on 
> the keyboard (most notably <enter>) while the new xterms pop
> up and steal the window focus have experienced unresponsive
> UML prompts.
Hmm, can you exclude this is some X11 problem? I get problems in my Opera 
browser when a Java applet is started (which makes a Java progress window 
appear for a while). No, I'm not joking. Please try getting the same thing 
inside normal consoles, or getting the same thing with xterms and without 
UML.

> no further keyboard input is processed...
>
> uml_mconsole <id> reboot and things can be made better.
> so the UML isn't locked up just the stdin....
>
> i've tried to go thru stdio_init -> open_console -> line_open
> to see if there was a likely place to drop a 'flush' of stdin
? I don't think stdin is flushable (but I don't understand what you mean, so I 
could be wrong).
> before we try attaching 0 -> 1 and 1 -> 0 (line_setup_irq)...
Hmm, line_setup_irq makes sure that a IRQ is triggered when a event is 
received on the fd. That fd is provided by the channel driver (the one in 
con=xterm/pty/fd).
> but i don't understand it all enough <frown>.

> this is redhat 9 + SKAS - NPTL 2.4.20-31 host kernel
> linux 2.4.26-3um guest kernel.

> thank you.

-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729
http://www.user-mode-linux.org/~blaisorblade





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