2008-09-24 Joel Sherrill <joel.sherrill@oarcorp.com>

	* clock_driver_simidle.c: New file.
	This implementation is for BSPs for simulators without a clock tick
	ISR.  It provides a special IDLE task that calls rtems_clock_tick()
	repeatedly when the application ends up in the IDLE task.  This
	simulates time advancing.  It is enough to run many tests but
	will not result in the correct behavior when you want timeslicing.
	This is because timeslicing assumes that a tick ISR determines
	that the currently executing thread must be switched out.  Without
	a clock tick ISR, this will not occur.

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