---
- branch: MAIN
  date: Fri Sep  4 16:41:39 UTC 2009
  files:
  - new: '1.16'
    old: '1.15'
    path: src/sys/rump/librump/rumpkern/ltsleep.c
    pathrev: src/sys/rump/librump/rumpkern/ltsleep.c@1.16
    type: modified
  id: 20090904T164139Z.82ae7587dfe590f8eeba7fa9c11dfd5586738843
  log: |
    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.
  module: src
  subject: 'CVS commit: src/sys/rump/librump/rumpkern'
  unixtime: '1252082499'
  user: pooka