| 摘要 |
An improved operating system kernel for a home communication terminal (HCT) includes an event filtering feature (204) which allows threads (A, B) running in the HCT to register interest in events of a particular type, from a particular source, or other desirable criteria. Events occurring in the system (205, 206) are prequalified by the kernel before providing them to individual threads which have registered interest in only certain types of events. By executing a filter in the kernel's context, a thread context switch can be avoided. Events occurring in the system can be matched with events of interest (200a, 200b, 200c) registered by various threads by an efficient comparison operation including a mask field and a code field. Additionally, various thread synchronization mechanisms such as alarms and semaphores can be implemented using a common event object which is integrated onto event queues.
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