cvs commit: src/sys/kern kern_lock.c kern_rwlock.c kern_sx.c src/sys/sys rwlock.h sx.h

attilio     2009-10-12 15:32:00 UTC
 
  FreeBSD src repository
 
  Modified files:        (Branch: RELENG_8)
    sys/kern             kern_lock.c kern_rwlock.c kern_sx.c
    sys/sys              rwlock.h sx.h
  Log:
  SVN rev 197981 on 2009-10-12 15:32:00Z by attilio
 
  MFC r197643, r197735:
  When releasing a read/shared lock we need to use a write memory barrier
  in order to avoid, on architectures which doesn't have strong ordered
  writes, CPU instructions reordering.
 
  Approved by:    re (kib)
 
  Revision   Changes    Path
  1.144.2.5  +3 -3      src/sys/kern/kern_lock.c
  1.48.2.5   +4 -3      src/sys/kern/kern_rwlock.c
  1.67.2.6   +4 -4      src/sys/kern/kern_sx.c
  1.21.2.2   +0 -7      src/sys/sys/rwlock.h
  1.42.2.2   +1 -8      src/sys/sys/sx.h