Provides timers that asynchronously notify an application after an interval or at a specific time.
The User class in the System Static Functions API provides simple functions to suspend a thread for a given interval or until a specific time.
The simple timer produces an event at a given system time or after a given interval. It is provided by RTimer . This service is wrapped in an active object by CTimer .
A periodic timer produces a sequence of events at a specified interval. The application is called through a callback ( TCallBack ) when they occur. It is provided by CPeriodic .
A heartbeat timer is similar to a periodic timer. However, if the application is busy handling another event when the timer event occurs, a periodic timer simple delays delivering the event, while a heartbeat timer will inform the application that it has missed the event.
It is provided by CHeartbeat . Applications are alerted to timer events through implementing an interface MBeating .
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