On Mon, 2009-12-07 at 01:25 -0500, Chris Ball wrote:
> Hi,
>
> > Curious: is there a trac bug # for this? I think stock Ubuntu
> > hardy might have the same problem (or a related one)?
>
> I think this bug is a pet peeve of dsd's, so he might reply with more
> details, but the sources I can find quickly are:
Doing VT_ACTIVATE then VT_WAITACTIVE is susceptible to a race, if
another process does VT_ACTIVATE to a different terminal inbetween those
2 calls then you're screwed.
For example think of these 2 processes running at the same time: chvt 1,
chvt 2
proc #1 proc #2
VT_ACTIVATE 1
VT_ACTIVATE 2
VT_WAITACTIVE 1
VT_WAITACTIVE 2
proc #2 will finish and you'll be on vt2, but proc #1 will wait and wait
and wait.
Daniel
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