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
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apm	Merged from sys/i386/i386/bioscall.s revision 1.9 and 1.10.	2001-04-01 07:08:13 +00:00
cbus	Merged from sys/dev/syscons/scterm-sc.c revision 1.16.	2001-08-07 12:10:17 +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	Convert the olpt driver to using new-bus stuff.	2001-07-29 11:11:45 +00:00
i386	Zap 'ptrace(PT_READ_U, ...)' and 'ptrace(PT_WRITE_U, ...)' since they	2001-08-08 05:25:15 +00:00
pc98	- Close races with signals and other AST's being triggered while we are in	2001-08-10 22:53:32 +00:00