CVS commit: src/sys/rump/librump/rumpkern

[Antti Kantee <pooka%netbsd.org@localhost>]

Module Name:    src
Committed By:   pooka
Date:           Fri Sep  4 16:41:39 UTC 2009

Modified Files:
        src/sys/rump/librump/rumpkern: ltsleep.c

Log Message:
Actually, we cannot release the megalock before we take sleepermtx,
since that opens a race window for non-mpsafe code, so do it after.
Additionally, we cannot call mutex_enter() for sleepermtx, since
ltsleep/mtsleep should not block (i.e. release kernel lock) before
actually blocking, so busyloop in mutex_tryenter().  Finally, when
waking up, take kernel lock back only *after* releasing sleepermtx
to avoid deadlock against another thread holding the kernel lock
and wanting sleepermtx.


To generate a diff of this commit:
cvs rdiff -u -r1.15 -r1.16 src/sys/rump/librump/rumpkern/ltsleep.c

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