C++ (Cpp) xen_atomic_xchg Exemples

Exemple #1

static inline void
evt_iterate_bits(volatile unsigned long *pendingl1,
		 volatile unsigned long *pendingl2, 
		 volatile unsigned long *mask,
		 iterate_func_t iterate_pending, void *iterate_args)
{

	KASSERT(pendingl1 != NULL);
	KASSERT(pendingl2 != NULL);
	
	unsigned long l1, l2;
	unsigned int l1i, l2i, port;

	l1 = xen_atomic_xchg(pendingl1, 0);
	while ((l1i = xen_ffs(l1)) != 0) {
		l1i--;
		l1 &= ~(1UL << l1i);

		l2 = pendingl2[l1i] & (mask != NULL ? ~mask[l1i] : -1UL);
		l2 &= curcpu()->ci_evtmask[l1i];

		if (mask != NULL) xen_atomic_setbits_l(&mask[l1i], l2);
		xen_atomic_clearbits_l(&pendingl2[l1i], l2);

		while ((l2i = xen_ffs(l2)) != 0) {
			l2i--;
			l2 &= ~(1UL << l2i);

			port = (l1i << LONG_SHIFT) + l2i;

			iterate_pending(port, l1i, l2i, iterate_args);
		}
	}
}

Exemple #2

/* process pending events */
static int
xenevt_processevt(void *v)
{
	long l1, l2;
	int l1i, l2i;
	int port;

	l1 = xen_atomic_xchg(&xenevt_ev1, 0);
	while ((l1i = xen_ffs(l1)) != 0) {
		l1i--;
		l1 &= ~(1UL << l1i);
		l2 = xen_atomic_xchg(&xenevt_ev2[l1i], 0);
		while ((l2i = xen_ffs(l2)) != 0) {
			l2i--;
			l2 &= ~(1UL << l2i);
			port = (l1i << LONG_SHIFT) + l2i;
			xenevt_event(port);
		}
	}

	return 0;
}