K 10
svn:author
V 3
kib
K 8
svn:date
V 27
2015-03-21T15:01:19.849934Z
K 7
svn:log
V 800
Somewhat modernize the SysV shm code:
- Use real locking, replace Giant with global sx protecting the
  subsystem.  Since the subsystem' lock is no longer dropped during
  the sleepsk, remove not needed SHMSEG_WANTED segment flag, and
  revert r278963.
- To do proper code simplification possible after the change of the
  lock, restructure several functions into _locked body and
  originally-named wrapper which calls into _locked variant.  This
  allows to eliminate the 'goto done2' spread over the code.
- Merge shm_find_segment_by_shmid() and shm_find_segment_by_shmidx().
- Consistently change all function prototypes to ANSI C.

Reviewed by:	mjg (who has earlier version of the similar patch to
	 introduce real locking)
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	2 weeks

END