C++ (Cpp) DoublyLinkedList::IsEmpty示例

static status_t
ethernet_link_checker(void *)
{
	while (true) {
		status_t status = acquire_sem_etc(sLinkChangeSemaphore, 1,
			B_RELATIVE_TIMEOUT, kLinkCheckInterval);
		if (status == B_BAD_SEM_ID)
			break;

		MutexLocker _(sListLock);

		if (sCheckList.IsEmpty())
			break;

		// check link state of all existing devices

		DoublyLinkedList<ethernet_device>::Iterator iterator
			= sCheckList.GetIterator();
		while (iterator.HasNext()) {
			update_link_state(iterator.Next());
		}
	}

	return B_OK;
}

示例#2

显示文件

文件： ethernet.cpp 项目： luciang/haiku

status_t
ethernet_up(net_device *_device)
{
	ethernet_device *device = (ethernet_device *)_device;

	device->fd = open(device->name, O_RDWR);
	if (device->fd < 0)
		return errno;

	uint64 dummy;
	if (ioctl(device->fd, ETHER_INIT, &dummy, sizeof(dummy)) < 0)
		goto err;

	if (ioctl(device->fd, ETHER_GETADDR, device->address.data, ETHER_ADDRESS_LENGTH) < 0)
		goto err;

	if (ioctl(device->fd, ETHER_GETFRAMESIZE, &device->frame_size, sizeof(uint32)) < 0) {
		// this call is obviously optional
		device->frame_size = ETHER_MAX_FRAME_SIZE;
	}

	if (update_link_state(device, false) == B_OK) {
		// device supports retrieval of the link state

		// Set the change notification semaphore; doesn't matter
		// if this is supported by the device or not
		ioctl(device->fd, ETHER_SET_LINK_STATE_SEM, &sLinkChangeSemaphore,
			sizeof(sem_id));

		MutexLocker _(&sListLock);

		if (sCheckList.IsEmpty()) {
			// start thread
			sLinkCheckerThread = spawn_kernel_thread(ethernet_link_checker,
				"ethernet link state checker", B_LOW_PRIORITY, NULL);
			if (sLinkCheckerThread >= B_OK)
				resume_thread(sLinkCheckerThread);
		}

		sCheckList.Add(device);
	}

	device->address.length = ETHER_ADDRESS_LENGTH;
	device->mtu = device->frame_size - device->header_length;
	return B_OK;

err:
	close(device->fd);
	device->fd = -1;
	return errno;
}