freebsd-dev/sys/ia64
John Baldwin 688ebe120c - Close races with signals and other AST's being triggered while we are in
the process of exiting the kernel.  The ast() function now loops as long
  as the PS_ASTPENDING or PS_NEEDRESCHED flags are set.  It returns with
  preemption disabled so that any further AST's that arrive via an
  interrupt will be delayed until the low-level MD code returns to user
  mode.
- Use u_int's to store the tick counts for profiling purposes so that we
  do not need sched_lock just to read p_sticks.  This also closes a
  problem where the call to addupc_task() could screw up the arithmetic
  due to non-atomic reads of p_sticks.
- Axe need_proftick(), aston(), astoff(), astpending(), need_resched(),
  clear_resched(), and resched_wanted() in favor of direct bit operations
  on p_sflag.
- Fix up locking with sched_lock some.  In addupc_intr(), use sched_lock
  to ensure pr_addr and pr_ticks are updated atomically with setting
  PS_OWEUPC.  In ast() we clear pr_ticks atomically with clearing
  PS_OWEUPC.  We also do not grab the lock just to test a flag.
- Simplify the handling of Giant in ast() slightly.

Reviewed by:	bde (mostly)
2001-08-10 22:53:32 +00:00
..
compile Don't need the .keep_me files. Obrien and I committed past each other. 2001-07-01 23:35:44 +00:00
conf gif(4) and stf(4) modernization: 2001-07-02 21:02:09 +00:00
ia64 - Close races with signals and other AST's being triggered while we are in 2001-08-10 22:53:32 +00:00
include - Close races with signals and other AST's being triggered while we are in 2001-08-10 22:53:32 +00:00
isa Repo copy i8237.h to dev/ic so we can get rid of some of the final vestiges 2001-06-30 05:29:11 +00:00