| 摘要 |
<p>A communications network, includes a plurality of switch elements SE, a controller for the switch elements, and a system manager. The controller comprises a main computer system and a reserve computer system, there being means for switching from the main computer system to the reserve computer system in the event of failure of the main computer system. The main computer system communicates state changes in the form of a message stream to the reserve computer system whereby to update the reserve system with the current network state. The main computer system also provides status information to the reserve computer system at regular intervals whereby to detect an in-service failure of the main computer system. The network provides client access to a plurality of servers and includes a plurality of capsules each containing client and server objects and each incorporating a nucleus supporting a plurality of client/server interfaces, wherein each nucleus includes means for pooling tasks, means for providing threads and for assigning those threads to respective tasks, and means for binding an assigned thread to its respective task during the execution of that task fig.3 (not shown).</p> |
