2000-03-23  Sebastian Wilhelmi  <wilhelmi@ira.uka.de>

	* configure.in: After finding the right thread library (containing
	e.g. pthread_create) we now search for the right realtime library
	(containing e.g. sched_get_priority_max). Makes the output of the
	thread related libraries correct.

	* gtimer.c (g_usleep): The current implementation of g_usleep
	(simply calling select) doesn't work reliable for multi-threaded
	programs on some platforms (bad omen for the main loop....), so I
	changed the implementation for thread-using programs to wait for a
	GCond for the specified amount of time (NB: sleep and usleep are
	not MT-safe in general, because they often use signals).