Jonathan Mini c76e33b681 Add kernel support needed for the KSE-aware libpthread:
- Use ucontext_t's to store KSE thread state.
	- Synthesize state for the UTS upon each upcall, rather than
	  saving and copying a trapframe.
	- Deliver signals to KSE-aware processes via upcall.
	- Rename kse mailbox structure fields to be more BSD-like.
	- Store the UTS's stack in struct proc in a stack_t.

Reviewed by:	bde, deischen, julian
Approved by:	-arch
2002-09-16 19:26:48 +00:00
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