lock.9: Minor markup improvements

Meanwhile, tweak a wording a bit.

kernel/lockmgr: Add lockmgr_try().

It just adds LK_NOWAIT to the flags and returns whether the
lock was obtained.

It is similar to other functions such as spin_trylock() or
FreeBSD's mtx_trylock()

kernel/lockmgr: Add lockmgr_try().

It just adds LK_NOWAIT to the flags and returns whether the
lock was obtained.

It is similar to other functions such as spin_trylock() or
FreeBSD's mtx_trylock() and can be used to port the latter.

Note that like these functions, it returns TRUE if successful,
while lockmgr() returns 0 if successful. This difference was
the source of minor confusion and porting mistakes in the past.
In fact, our driver porting document also didn't point out this
difference. I will fix some of these little issues in a separate
commit.

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lock.9: lockcount() and lockcountnb() were removed in 3b6a19b26fb9c0e7918.

kernel - Fix rare lockmgr() state transition (2)

* Fix two lock timeout cases for LK_EXCLUPGRADE and LK_UPGRADE, and
fix a bug in undo_upreq().

* A tsleep failure (such as the LK_TIMELOCK case vi

kernel - Fix rare lockmgr() state transition (2)

* Fix two lock timeout cases for LK_EXCLUPGRADE and LK_UPGRADE, and
fix a bug in undo_upreq().

* A tsleep failure (such as the LK_TIMELOCK case via
vm_map_lock_read_to()) was not properly backing-out a LKC_UPREQ,
resulting in a situation where the lock becomes exclusively owned
by nobody and deadlocks against all-comers. Fix by properly
calling undo_upreq().

* Fix a bug in undo_upreq() itself. When undoing a granted UPREQ,
the lockholder must be set prior to releasing the now-granted
exclusive lock in order to avoid an assertion panic.

* While we are at it, replace a weird cmpset count,count with a
fetchadd(count, 0).

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locking.9 updates

manpages: Update documentation of lock(9) to include lockowned

start adding .Mt to email addresses in man pages

This covers share/man/man[1579]. It also consolidates multiple lines
into one, removes spurious double quotes in names or emails,
and changes punctua

start adding .Mt to email addresses in man pages

This covers share/man/man[1579]. It also consolidates multiple lines
into one, removes spurious double quotes in names or emails,
and changes punctuation where appropriate. The target style is:
.An Name Aq Mt name@somewhere.tdl

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kernel: Change wmesg type for lockinit, lockreinit

* change type of parameter wmesg to const char * for lockinit and
lockreinit.
* change type of member wmesg of struct lock to const char *
* adap

kernel: Change wmesg type for lockinit, lockreinit

* change type of parameter wmesg to const char * for lockinit and
lockreinit.
* change type of member wmesg of struct lock to const char *
* adapt manpage lock(9)

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Initial import of binutils 2.22 on the new vendor branch

Future versions of binutils will also reside on this branch rather
than continuing to create new binutils branches for each new version.

Fix typo: LG_CANRECURSE -> LK_CANRECURSE

The LK_NOPAUSE flag was removed last year.

Sync with reality:

* lockinit() no longer takes a prio argument.
* lockmgr() no longer takes a thread pointer argument.

Submitted-by: Bill Marquette <bill.marquette@gmail.com>

Adjust manual pages to recent lock related changes.

Document lockcountnb(9) which is the non-blocking counterpart of
lockcount(9). Add it to the MLINKs as well.

Correct header name, it is sys/lock.h and not sys/lockmgr.h.

Correct mdoc(7).

* use .Po/.Pc for parenthesis which extend more than a line

* .In is not a callable macro from anything other than SYNOPSIS,
use .Pa (pathname) macro instead

Add lock.9 man page, it is also symlinked to: lockcount.9, lockinit.9,
lockmgr.9, lockmgr_printinfo.9 and lockstatus.9.

Obtained from: FreeBSD

lock.9: Mention lockuninit().

In man9 manual pages, add some references to where the code is.

Submitted-by: Venkatesh Srinivas <me@endeavour.zapto.org>