2007-12-06  Pascal Obry  <obry@adacore.com>

	* adaint.c (__gnat_pthread_setaffinity_np): New routine. A dummy
	 version is provided for older GNU/Linux distribution not
	 supporting thread affinity sets.
	
	* s-osinte-linux.ads (SC_NPROCESSORS_ONLN): New constant for sysconf
	call.
	(bit_field): New packed boolean type used by cpu_set_t.
	(cpu_set_t): New type corresponding to the C type with
	the same name. Note that on the Ada side we use a bit
	field array for the affinity mask. There is not need
	for the C macro for setting individual bit.
	(pthread_setaffinity_np): New imported routine.
	
	* s-taprop-linux.adb (Enter_Task): Check that the CPU affinity mask is
	no null.
	(Create_Task): Set the processor affinity mask if information
	is present.
	
	* s-tasinf-linux.ads, s-tasinf-linux.adb: New files.

From-SVN: r130812