First step in making the SCHED_LOCK not recursive.

 - Defer the sending of SIGCHLD and waking the parent when a process goes
   to sleep. We set a flag in the process "P_STOPPED" and schedule a
   timeout that checks all processes for this flag and sends SIGCHLD
   and wakes the parent on those processes that have this flag set.
 - Delay the waking of the parent in psignal on SIGCONT until we've
   released the SCHED_LOCK at the end.
 - In issignal, check for P_SINTR as a way to see we were called from
   the tsleep path with SCHED_LOCK locked and don't skip locking
   in that case. (This is slightly ugly, but it works until we have
   some better way).

miod@ ok (after finding and fixing an MD bug on sgi)

0 files changed, 0 insertions, 0 deletions