lib/thread/ncpu+linux.myr


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use std
use sys

pkg thread =
	const ncpu	: (-> int)
;;

const ncpu = {
	var cpubuf : uint64[4]
	var n

	sys.sched_getaffinity(sys.getpid(), sizeof(uint64[4]), (&cpubuf : uint64#))
	n = 0
	for b : cpubuf[:]
		if b != 0
			n += count(b)
		;;
	;;
	-> n
}

const count = {b
	var n = 0
	for var i = 0; i < 8*sizeof(uint64); i++
		if b & (1<<i) != 0
			n++
		;;
	;;
	-> n
}