K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2018-02-16T16:07:58.265956Z
K 7
svn:log
V 278
MFC r327875,r327905,r327914:

    mtx: use fcmpset to cover setting MTX_CONTESTED

===

    rwlock: try regular read unlock even in the hard path

    Saves on turnstile trips if the lock got more readers.

===

    sx: retry hard shared unlock just like in r327905 for rwlocks

END