Hi.
On Sat, 2007-04-07 at 11:33 +0200, Rafael J. Wysocki wrote:
> On Saturday, 7 April 2007 00:20, Nigel Cunningham wrote:
> > > > > > > - current->flags |= PF_NOFREEZE;
> > > > > > > + freezer_exempt(FE_ALL);
> > > > > > > pid = kernel_thread(do_linuxrc, "/linuxrc", SIGCHLD);
> > > > > > > if (pid > 0) {
> > > > > > > while (pid != sys_wait4(-1, NULL, 0, NULL))
> > > > > >
> > > > > > Does this mean we have userland /linuxrc running with PF_NOFREEZE?
> > > > > > That would be very bad...
> > > > >
> > > > > No, actually it is _required_ for the userland resume to work. Well,
> > > > > perhaps
> > > > > I should place a comment in there so that I don't have to explain
> > > > > this again
> > > > > and again. :-)
> > > >
> > > > Can you put big bold comment there?
> > > >
> > > > Why is it needed? Freezer never freezes _current_ task.
> > >
> > > No, it doesn't, but this task spawns linuxrc and then calls sys_wait4()
> > > in a
> > > loop.
> > >
> > > Well, actually, I'll try to plant try_to_freeze() in this loop and see if
> > > that
> > > works. If it doesn't, I'll add a comment.
> >
> > It works. I've had:
> >
> > while (pid != sys_wait4(-1, NULL, 0, NULL)) {
> > yield();
> > try_to_freeze();
> > }
> >
> > there for ages for Suspend2.
>
> OK, thanks. Is there any particular reason to place try_to_freeze() after
> yield()?
Not that I remember. I haven't touched that for years :)
Nigel
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