C++ (Cpp) fw_read_asyncの例

コード例 #1

ファイル: fwdev.c プロジェクト: Alkzndr/freebsd

/*
 * read request.
 */
static int
fw_read(struct cdev *dev, struct uio *uio, int ioflag)
{
	struct fw_drv1 *d;
	struct fw_xferq *ir;
	struct firewire_comm *fc;
	int err = 0, s, slept = 0;
	struct fw_pkt *fp;

	if (DEV_FWMEM(dev))
		return (physio(dev, uio, ioflag));

	d = dev->si_drv1;
	fc = d->fc;
	ir = d->ir;

	if (ir == NULL)
		return (fw_read_async(d, uio, ioflag));

	if (ir->buf == NULL)
		return (EIO);

	FW_GLOCK(fc);
readloop:
	if (ir->stproc == NULL) {
		/* iso bulkxfer */
		ir->stproc = STAILQ_FIRST(&ir->stvalid);
		if (ir->stproc != NULL) {
			s = splfw();
			STAILQ_REMOVE_HEAD(&ir->stvalid, link);
			splx(s);
			ir->queued = 0;
		}
	}
	if (ir->stproc == NULL) {
		/* no data avaliable */
		if (slept == 0) {
			slept = 1;
			ir->flag |= FWXFERQ_WAKEUP;
			err = msleep(ir, FW_GMTX(fc), FWPRI, "fw_read", hz);
			ir->flag &= ~FWXFERQ_WAKEUP;
			if (err == 0)
				goto readloop;
		} else if (slept == 1)
			err = EIO;
		FW_GUNLOCK(fc);
		return err;
	} else if (ir->stproc != NULL) {
		/* iso bulkxfer */
		FW_GUNLOCK(fc);
		fp = (struct fw_pkt *)fwdma_v_addr(ir->buf,
		    ir->stproc->poffset + ir->queued);
		if (fc->irx_post != NULL)
			fc->irx_post(fc, fp->mode.ld);
		if (fp->mode.stream.len == 0) {
			err = EIO;
			return err;
		}
		err = uiomove((caddr_t)fp,
			fp->mode.stream.len + sizeof(uint32_t), uio);
		ir->queued++;
		if (ir->queued >= ir->bnpacket) {
			s = splfw();
			STAILQ_INSERT_TAIL(&ir->stfree, ir->stproc, link);
			splx(s);
			fc->irx_enable(fc, ir->dmach);
			ir->stproc = NULL;
		}
		if (uio->uio_resid >= ir->psize) {
			slept = -1;
			FW_GLOCK(fc);
			goto readloop;
		}
	}
	return err;
}

コード例 #2

ファイル: fwdev.c プロジェクト: eyberg/rumpkernel-netbsd-src

int
fw_read(dev_t dev, struct uio *uio, int ioflag)
{
	struct firewire_softc *sc;
	struct firewire_comm *fc;
	struct fw_drv1 *d;
	struct fw_xferq *ir;
	struct fw_pkt *fp;
	int err = 0, slept = 0;

	sc = device_lookup_private(&ieee1394if_cd, DEV2UNIT(dev));
	if (sc == NULL)
		return ENXIO;

	if (DEV_FWMEM(dev))
		return physio(fw_strategy, NULL, dev, ioflag, minphys, uio);

	d = (struct fw_drv1 *)sc->si_drv1;
	fc = d->fc;
	ir = d->ir;

	if (ir == NULL)
		return fw_read_async(d, uio, ioflag);

	if (ir->buf == NULL)
		return EIO;

	mutex_enter(&fc->fc_mtx);
readloop:
	if (ir->stproc == NULL) {
		/* iso bulkxfer */
		ir->stproc = STAILQ_FIRST(&ir->stvalid);
		if (ir->stproc != NULL) {
			STAILQ_REMOVE_HEAD(&ir->stvalid, link);
			ir->queued = 0;
		}
	}
	if (ir->stproc == NULL) {
		/* no data avaliable */
		if (slept == 0) {
			slept = 1;
			ir->flag |= FWXFERQ_WAKEUP;
			mutex_exit(&fc->fc_mtx);
			err = tsleep(ir, FWPRI, "fw_read", hz);
			mutex_enter(&fc->fc_mtx);
			ir->flag &= ~FWXFERQ_WAKEUP;
			if (err == 0)
				goto readloop;
		} else if (slept == 1)
			err = EIO;
		mutex_exit(&fc->fc_mtx);
		return err;
	} else if (ir->stproc != NULL) {
		/* iso bulkxfer */
		mutex_exit(&fc->fc_mtx);
		fp = (struct fw_pkt *)fwdma_v_addr(ir->buf,
		    ir->stproc->poffset + ir->queued);
		if (fc->irx_post != NULL)
			fc->irx_post(fc, fp->mode.ld);
		if (fp->mode.stream.len == 0)
			return EIO;
		err = uiomove((void *)fp,
		    fp->mode.stream.len + sizeof(uint32_t), uio);
		ir->queued++;
		if (ir->queued >= ir->bnpacket) {
			STAILQ_INSERT_TAIL(&ir->stfree, ir->stproc, link);
			fc->irx_enable(fc, ir->dmach);
			ir->stproc = NULL;
		}
		if (uio->uio_resid >= ir->psize) {
			slept = -1;
			mutex_enter(&fc->fc_mtx);
			goto readloop;
		}
	} else
		mutex_exit(&fc->fc_mtx);
	return err;
}