C++ (Cpp) backend_switch_state Beispiele

Beispiel #1

Datei: xenbus.c Projekt: gxt/linux

/* Handle backend state transitions:
 *
 * The backend state starts in Initialising and the following transitions are
 * allowed.
 *
 * Initialising -> InitWait -> Connected
 *          \
 *           \        ^    \         |
 *            \       |     \        |
 *             \      |      \       |
 *              \     |       \      |
 *               \    |        \     |
 *                \   |         \    |
 *                 V  |          V   V
 *
 *                  Closed  <-> Closing
 *
 * The state argument specifies the eventual state of the backend and the
 * function transitions to that state via the shortest path.
 */
static void set_backend_state(struct backend_info *be,
			      enum xenbus_state state)
{
	while (be->state != state) {
		switch (be->state) {
		case XenbusStateInitialising:
			switch (state) {
			case XenbusStateInitWait:
			case XenbusStateConnected:
			case XenbusStateClosing:
				backend_switch_state(be, XenbusStateInitWait);
				break;
			case XenbusStateClosed:
				backend_switch_state(be, XenbusStateClosed);
				break;
			default:
				BUG();
			}
			break;
		case XenbusStateClosed:
			switch (state) {
			case XenbusStateInitWait:
			case XenbusStateConnected:
				backend_switch_state(be, XenbusStateInitWait);
				break;
			case XenbusStateClosing:
				backend_switch_state(be, XenbusStateClosing);
				break;
			default:
				BUG();
			}
			break;
		case XenbusStateInitWait:
			switch (state) {
			case XenbusStateConnected:
				backend_connect(be);
				backend_switch_state(be, XenbusStateConnected);
				break;
			case XenbusStateClosing:
			case XenbusStateClosed:
				backend_switch_state(be, XenbusStateClosing);
				break;
			default:
				BUG();
			}
			break;
		case XenbusStateConnected:
			switch (state) {
			case XenbusStateInitWait:
			case XenbusStateClosing:
			case XenbusStateClosed:
				backend_disconnect(be);
				backend_switch_state(be, XenbusStateClosing);
				break;
			default:
				BUG();
			}
			break;
		case XenbusStateClosing:
			switch (state) {
			case XenbusStateInitWait:
			case XenbusStateConnected:
			case XenbusStateClosed:
				backend_switch_state(be, XenbusStateClosed);
				break;
			default:
				BUG();
			}
			break;
		default:
			BUG();
		}
	}
}

Beispiel #2

Datei: xenbus.c Projekt: 383530895/linux

/* Handle backend state transitions:
 *
 * The backend state starts in InitWait and the following transitions are
 * allowed.
 *
 * InitWait -> Connected
 *
 *    ^    \         |
 *    |     \        |
 *    |      \       |
 *    |       \      |
 *    |        \     |
 *    |         \    |
 *    |          V   V
 *
 *  Closed  <-> Closing
 *
 * The state argument specifies the eventual state of the backend and the
 * function transitions to that state via the shortest path.
 */
static void set_backend_state(struct backend_info *be,
			      enum xenbus_state state)
{
	while (be->state != state) {
		switch (be->state) {
		case XenbusStateClosed:
			switch (state) {
			case XenbusStateInitWait:
			case XenbusStateConnected:
				pr_info("%s: prepare for reconnect\n",
					be->dev->nodename);
				backend_switch_state(be, XenbusStateInitWait);
				break;
			case XenbusStateClosing:
				backend_switch_state(be, XenbusStateClosing);
				break;
			default:
				BUG();
			}
			break;
		case XenbusStateInitWait:
			switch (state) {
			case XenbusStateConnected:
				backend_connect(be);
				backend_switch_state(be, XenbusStateConnected);
				break;
			case XenbusStateClosing:
			case XenbusStateClosed:
				backend_switch_state(be, XenbusStateClosing);
				break;
			default:
				BUG();
			}
			break;
		case XenbusStateConnected:
			switch (state) {
			case XenbusStateInitWait:
			case XenbusStateClosing:
			case XenbusStateClosed:
				backend_disconnect(be);
				backend_switch_state(be, XenbusStateClosing);
				break;
			default:
				BUG();
			}
			break;
		case XenbusStateClosing:
			switch (state) {
			case XenbusStateInitWait:
			case XenbusStateConnected:
			case XenbusStateClosed:
				backend_switch_state(be, XenbusStateClosed);
				break;
			default:
				BUG();
			}
			break;
		default:
			BUG();
		}
	}
}