2005-04-16 Andrew J. Schorr <ajschorr@alumni.princeton.edu>

2005-04-16 Andrew J. Schorr <ajschorr@alumni.princeton.edu>

	* configure.ac: Added AC_ARG_ENABLE(time-check).  By default,
	  warning messages will now be printed for threads or commands that take
	  longer than 5 seconds, but this configure argument can be used
	  to disable the checks or change the threshold.
	* thread.h (thread_consumed_time): Declare new function to calculate
	  elapsed microseconds.
	* thread.c (thread_consumed_time): Must be global not static so we
	  can call it from lib/vty.c:vty_command.
	  (thread_should_yield): Surround with `#if 0' to make clear that this
	  function is not currently being used anywhere.
	  (thread_call): If CONSUMED_TIME_CHECK is defined, print a CPU HOG
	  warning message if the thread takes more than CONSUMED_TIME_CHECK
	  microseconds.
	* vty.c (vty_command): If CONSUMED_TIME_CHECK is defined, print a CPU
	  HOG warning message if the command takes more than CONSUMED_TIME_CHECK
	  microseconds.