Machine generated patch which changes linedisc calls from accessing
linesw[] directly to using the ttyld...() functions

The ttyld...() functions ar inline so there is no performance hit.

Get rid of ttyregister(). All drivers now use ttymalloc() for struct
tty, so now we stand a chance of implementing refcounting and getting
rid of the damn things again.

Introduce a ttyioctl() cdevsw default function.

Remove advertising clause from University of California Regent's
license, per letter dated July 22, 1999 and email from Peter Wemm,
Alan Cox and Robert Watson.

Approved by: core, peter, alc, rwatson

Device megapatch 3/6:

Add missing D_TTY flags to various drivers.

Complete asserts that dev_t's passed to ttyread(), ttywrite(),
ttypoll() and ttykqwrite() have (d_flags & D_TTY) and a struct tty
p

Device megapatch 3/6:

Add missing D_TTY flags to various drivers.

Complete asserts that dev_t's passed to ttyread(), ttywrite(),
ttypoll() and ttykqwrite() have (d_flags & D_TTY) and a struct tty
pointer.

Make ttyread(), ttywrite(), ttypoll() and ttykqwrite() the default
cdevsw methods for D_TTY drivers and remove the explicit initializations
in various drivers cdevsw structures.

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T -CURRENT DO NOT CRASH UPON ^T K PLZ THX.

Also, use sched_pctcpu() instead of assuming td->td_kse is non-NULL.

A variety of further cleanups to ttyinfo():

- Rename temporary variable names ("tmp", "tmp2") to more informative
names ("load", "pctcpu", "rss", ...)

- Unclutter indentation and return paths: ra

A variety of further cleanups to ttyinfo():

- Rename temporary variable names ("tmp", "tmp2") to more informative
names ("load", "pctcpu", "rss", ...)

- Unclutter indentation and return paths: rather than lots of nested
ifs, simply return earlier if it's not going to work out. Simplify
general structure and avoid "deep" code.

- Comment on the thread/process selection and locking.

- Correct handling of "running"/"runnable" states, avoid "unknown"
that people were seeing for running processes. This was due to
a misunderstanding of the more complex state machine / inhibitors
behavior of KSE.

- Do perform ttyinfo() printing on KSE (P_SA) processes, it seems
generally to work.

While I initially attempted to formulate this as two commits (one
layout, the other content), I concluded that the layout changes were
really structural changes.

Many elements submitted by: bde

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Improve the expressiveness of ttyinfo (^T) when dealing with threads
in slightly less usual states:

If the thread is on a run queue, display "running" if the thread is
actually running, otherwis

Improve the expressiveness of ttyinfo (^T) when dealing with threads
in slightly less usual states:

If the thread is on a run queue, display "running" if the thread is
actually running, otherwise, "runnable".

If the thread is sleeping, and it's on a sleep queue, display the
name of the queue, otherwise "unknown" -- previously, in this situation
we would display "iowait".

If the thread is waiting on a lock, display *lockname.

If the thread is suspended, display "suspended" -- previously, in
this situation we would display "iowait".

If the thread is waiting for an interrupt, display "intrwait" --
previously, in this situation we would display "iowait".

If the thread is in a state not handled by the above, display
"unknown" -- previously, we would print "iowait".

Among other things, this avoids displaying "iowait" when the foreground
process turns out to be suspended waiting for a debugger to properly
attach.

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- Implement selwakeuppri() which allows raising the priority of a
thread being waken up. The thread waken up can run at a priority as
high as after tsleep().

- Replace selwakeup()s with selwake

- Implement selwakeuppri() which allows raising the priority of a
thread being waken up. The thread waken up can run at a priority as
high as after tsleep().

- Replace selwakeup()s with selwakeuppri()s and pass appropriate
priorities.

- Add cv_broadcastpri() which raises the priority of the broadcast
threads. Used by selwakeuppri() if collision occurs.

Not objected in: -arch, -current

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Use a new message buffer `consmsgbuf' to forward messages to a
TIOCCONS console (e.g. xconsole) via a timeout routine instead of
calling into the tty code directly from printf(). This fixes a
number

Use a new message buffer `consmsgbuf' to forward messages to a
TIOCCONS console (e.g. xconsole) via a timeout routine instead of
calling into the tty code directly from printf(). This fixes a
number of cases where calling printf() at the wrong time (such as
with locks held) would cause a panic if xconsole is running.

The TIOCCONS message buffer is 8k in size by default, but this can
be changed with the kern.consmsgbuf_size sysctl. By default, messages
are checked for 5 times per second. The timer runs and the buffer
memory remains allocated only at times when a TIOCCONS console is
active.

Discussed on: freebsd-arch

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Rename P_THREADED to P_SA. P_SA means a process is using scheduler
activations.

Use __FBSDID().

p_sigignore moved into struct sigacts. move one which was missed.

Approved by: re (scottl)

- Merge struct procsig with struct sigacts.
- Move struct sigacts out of the u-area and malloc() it using the
M_SUBPROC malloc bucket.
- Add a small sigacts_*() API for managing sigacts structures:

- Merge struct procsig with struct sigacts.
- Move struct sigacts out of the u-area and malloc() it using the
M_SUBPROC malloc bucket.
- Add a small sigacts_*() API for managing sigacts structures: sigacts_alloc(),
sigacts_free(), sigacts_copy(), sigacts_share(), and sigacts_shared().
- Remove the p_sigignore, p_sigacts, and p_sigcatch macros.
- Add a mutex to struct sigacts that protects all the members of the struct.
- Add sigacts locking.
- Remove Giant from nosys(), kill(), killpg(), and kern_sigaction() now
that sigacts is locked.
- Several in-kernel functions such as psignal(), tdsignal(), trapsignal(),
and thread_stopped() are now MP safe.

Reviewed by: arch@
Approved by: re (rwatson)

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- Use a local struct proc variable to improve readability.
- Use a local variable to close a minor race when determining if the wmesg
printed out needs a prefix such as when a thread is blocked o

- Use a local struct proc variable to improve readability.
- Use a local variable to close a minor race when determining if the wmesg
printed out needs a prefix such as when a thread is blocked on a lock.

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- Move p->p_sigmask to td->td_sigmask. Signal masks will be per thread with
a follow on commit to kern_sig.c
- signotify() now operates on a thread since unmasked pending signals are
stored i

- Move p->p_sigmask to td->td_sigmask. Signal masks will be per thread with
a follow on commit to kern_sig.c
- signotify() now operates on a thread since unmasked pending signals are
stored in the thread.
- PS_NEEDSIGCHK moves to TDF_NEEDSIGCHK.

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Make TTYHOG tunable.

Reviewed by: mike (mentor)

Change the process flags P_KSES to be P_THREADED.
This is just a cosmetic change but I've been meaning to do it for about a year.

Back out M_* changes, per decision of the TRB.

Approved by: trb

Remove #include <sys/dkstat.h>

Move the tty related statistics counters to live with the tty code.

Lock the proc around accessing p_siglist in ttycheckoutq() in the
unused wait != 0 case.

Remove M_TRYWAIT/M_WAITOK/M_WAIT. Callers should use 0.
Merge M_NOWAIT/M_DONTWAIT into a single flag M_NOWAIT.

In an SMP environment post-Giant it is no longer safe to blindly
dereference the struct sigio pointer without any locking. Change
fgetown() to take a reference to the pointer instead of a copy of th

In an SMP environment post-Giant it is no longer safe to blindly
dereference the struct sigio pointer without any locking. Change
fgetown() to take a reference to the pointer instead of a copy of the
pointer and call SIGIO_LOCK() before copying the pointer and
dereferencing it.

Reviewed by: rwatson

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Rename the mutex thread and process states to use a more generic 'LOCK'
name instead. (e.g., SLOCK instead of SMTX, TD_ON_LOCK() instead of
TD_ON_MUTEX()) Eventually a turnstile abstraction will be

Rename the mutex thread and process states to use a more generic 'LOCK'
name instead. (e.g., SLOCK instead of SMTX, TD_ON_LOCK() instead of
TD_ON_MUTEX()) Eventually a turnstile abstraction will be added that
will be shared with mutexes and other types of locks. SLOCK/TDI_LOCK will
be used internally by the turnstile code and will not be specific to
mutexes. Making the change now ensures that turnstiles can be dropped
in at a later date without affecting the ABI of userland applications.

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