Provides miscellaneous low-level services for notifying programs of environment changes and of thread deaths, and for putting simple messages on screen.
The API has three key concepts: change notifier, thread-death notifier, and simple screen output service.
The change notifier signals the requesting thread's request semaphore when a change in the environment occurs, such as a switch in locale, or system time being reset.
The change notifier interface is provided by RChangeNotifier .
Note that the Environment Change Notifier API provides the same service, wrapped in an active object.
The thread-death notifier signals the requesting thread's request semaphore when a specified other thread terminates.
The thread-death notifier interface is provided by RUndertaker .
Simple screen output service
The simple screen output service allows either a single line message or a simple dialog box to be displayed on the screen. It is typically used for debug messages.
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