2005-04-22 Paul Jakma <paul.jakma@sun.com>

2005-04-22 Paul Jakma <paul.jakma@sun.com>

	* thread.h: Add background thread type and thread_add_background
	  macro and accompanying funcname_... function.
	  export thread_should_yield, background threads can use it.
	  Lower thread yield time to 10ms, 100ms is noticeable lag and
	  a thread would only be /starting/ to finish sometime afterward.
	* thread.c: (general) Add background thread type and schedule
	  nearly all thread types through the ready list for fairness.
	  (timeval_adjust) static qualifier missing
	  (vty_out_cpu_thread_history) add support for printout of
	  background threads
	  (show_thread_cpu) ditto.
	  (thread_master_debug) add debug of background list
	  (thread_master_create) fixup long line
	  (thread_add_unuse) add asserts for required state.
	  (thread_master_free) free background thread list
	  (funcname_thread_add_timer_timeval) make generic, able to
	  support arbitrary timer-like thread types.
	  (funcname_thread_add_timer) pass thread type to .._add_timer_timeval
	  (funcname_thread_add_timer_msec) ditto
	  (funcname_thread_add_background) Add a background thread, with an
	  optional millisecond delay factor, using .._add_timer_timeval.
	  (thread_cancel) Add background thread type.
	  Move the thread_list_delete common to all cases to bottom of
	  function, after the switch statement..
	  (thread_cancel_event) indent
	  (thread_timer_wait) Static qualifier, and make it able to cope
	  with arbitrary timer-like thread lists, so its of use to
	  background threads too.
	  (thread_process_fd) static qualifier. Again, make it take a list
	  reference rather than thread_master. Fix indentation.
	  (thread_timer_process) Check for ready timer-like threads in the
	  given list and move them on to the ready list - code originally
	  embedded in thread_fetch.
	  (thread_fetch) Schedule all threads, other than events, through
	  the ready list, to ensure fairness. Timer readying code moved to
	  thread_timer_process so it can be reused for background threads.
	  Remove the unneeded quagga_sigevent_process, as pointed out by
	  John Lin <john.ch.lin@gmail.com>.
	  (thread_should_yield) make this available.