git: DragonFly_RELEASE_2_8 kernel - revamp mtx_spinlock()

[Matthew Dillon]

commit c40689e9b134213e4a3e29c2548d0ec47c7dd40b
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Tue Oct 19 23:19:29 2010 -0700

    kernel - revamp mtx_spinlock()
    
    * Revamp mtx_spinlock(), add mtx_spinlock_try(), and add mtx_spinunlock().
    
    * Enter a proper hard critical section when using mtx_spinlock*(),
      just like the normal spinlock() code does.
    
      The difference is that mtx spinlocks have a ref count and thus are
      reentrant.
    
    * mtx_spinlock*() is not used in the code yet.  A followup commit will
      begin using it for the syscons lock.

Summary of changes:
 sys/kern/kern_mutex.c |   50 +++++++++++++++++++++++++++++-
 sys/sys/mutex.h       |    4 +-
 sys/sys/mutex2.h      |   81 +++++++++++++++++++++++++++++++++++++-----------
 3 files changed, 113 insertions(+), 22 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/c40689e9b134213e4a3e29c2548d0ec47c7dd40b


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