C++ (Cpp) XENFB_IN_RING_REF Exemples

Exemple #1

Fichier : fbfront.c Projet : farewellkou/xen

int fbfront_receive(struct fbfront_dev *dev, union xenfb_in_event *buf, int n)
{
    struct xenfb_page *page = dev->page;
    uint32_t prod, cons;
    int i;

#ifdef HAVE_LIBC
    if (dev->fd != -1) {
        files[dev->fd].read = 0;
        mb(); /* Make sure to let the handler set read to 1 before we start looking at the ring */
    }
#endif

    prod = page->in_prod;

    if (prod == page->in_cons)
        return 0;

    rmb();      /* ensure we see ring contents up to prod */

    for (i = 0, cons = page->in_cons; i < n && cons != prod; i++, cons++)
        memcpy(buf + i, &XENFB_IN_RING_REF(page, cons), sizeof(*buf));

    mb();       /* ensure we got ring contents */
    page->in_cons = cons;
    notify_remote_via_evtchn(dev->evtchn);

#ifdef HAVE_LIBC
    if (cons != prod && dev->fd != -1)
        /* still some events to read */
        files[dev->fd].read = 1;
#endif

    return i;
}

Exemple #2

Fichier : xenfb.c Projet : BackupTheBerlios/ar7-firmware-svn

static void xenfb_send_event(struct XenFB *xenfb, union xenfb_in_event *event)
{
    uint32_t prod;
    struct xenfb_page *page = xenfb->c.page;

    prod = page->in_prod;
    /* caller ensures !xenfb_queue_full() */
    xen_mb();                   /* ensure ring space available */
    XENFB_IN_RING_REF(page, prod) = *event;
    xen_wmb();                  /* ensure ring contents visible */
    page->in_prod = prod + 1;

    xen_be_send_notify(&xenfb->c.xendev);
}

Exemple #3

static void xenfb_send_event(struct xenfb *xenfb, union xenfb_in_event *event)
{
	uint32_t prod;
	struct xenfb_page *page = xenfb->fb.page;

	prod = page->in_prod;
	/* caller ensures !xenfb_queue_full() */
	xen_mb();                   /* ensure ring space available */
	XENFB_IN_RING_REF(page, prod) = *event;
	xen_wmb();                  /* ensure ring contents visible */
	page->in_prod = prod + 1;

	xc_evtchn_notify(xenfb->evt_xch, xenfb->fb.port);
}