CVS commit: src/sys

["matthew green" <mrg%netbsd.org@localhost>]

Module Name:    src
Committed By:   mrg
Date:           Sat Dec 16 03:13:29 UTC 2017

Modified Files:
        src/sys/kern: subr_pool.c
        src/sys/sys: pool.h

Log Message:
hopefully workaround the irregularly "fork fails in init" problem.

if a pool is growing, and the grower is PR_NOWAIT, mark this.
if another caller wants to grow the pool and is also PR_NOWAIT,
busy-wait for the original caller, which should either succeed
or hard-fail fairly quickly.

implement the busy-wait by unlocking and relocking this pools
mutex and returning ERESTART.  other methods (such as having
the caller do this) were significantly more code and this hack
is fairly localised.

ok chs@ riastradh@


To generate a diff of this commit:
cvs rdiff -u -r1.218 -r1.219 src/sys/kern/subr_pool.c
cvs rdiff -u -r1.81 -r1.82 src/sys/sys/pool.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.