9bb1baef4e
An event can be anything ranging from the exit of a process (interesting to `wait4`) to the arrival of a blocked signal (interesting to `sigwaitinfo`), from the completion of a file operation (interesting to `epoll`) to the change of a file status (interesting to `inotify`). To meet the event-related demands from various subsystems, this event subsystem is designed to provide a set of general-purpose primitives: * `Waiter`, `Waker`, and `WaiterQueue` are primitives to put threads to sleep and later wake them up. * `Event`, `Observer`, and `Notifier` are primitives to handle and broadcast events. * `WaiterQueueObserver` implements the common pattern of waking up threads once some interesting events happen. |
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