jhb 27d39b6a8b - Use sched_lock and critical regions to ensure that LDT updates are thread
safe from preemption and concurrent access to the LDT.
- Move the prototype for i386_extend_pcb() to <machine/pcb_ext.h>.

Reviewed by:	silence on -hackers
2001-05-10 17:03:03 +00:00
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