fn bench_rb_puts(b: &mut Bencher) {
    	unsafe {
	    	b.iter(|| {
		    	let mut rb = RingBuffer::new(100);
    			let arc = Arc::new(&rb);
	    		let mut guards = vec![];
	    		for i in 0..8 {
	    			let mut rb = arc.clone();
		    		let guard = thread::scoped(move || {
		    			for i in 0..10 {
		    				rb.put(i);
		    			}
	    			});
	    			guards.push(guard);
	    		}

	    		for g in guards {
	    			g.join();
	    		}
    		});
    	}
    }