Syncronized Scheduler Concepts

Syncronized Scheduler Concepts

The first Frame Scheduler provides the time base for the others. It is called the sync-master scheduler. The other schedulers take their time base interrupts from the sync-master, and so are called sync-slaves. The combination is called a sync group.

No single process may create more than one Frame Scheduler. This is because every Frame Scheduler must have a unique FRS control process to which it can send signals. As a result, the program will have three types of processes:

a master process that sets up global data and creates the master Frame Scheduler
one FRS control process for each sync-slave Frame Scheduler
activity processes

The sync-master scheduler must be created before any sync-slave schedulers can be created. Sync-slaves must be specified to have the same time base and the same number of minor frames as the sync-master.

Sync-slave schedulers can be stopped and restarted independently. However, when any scheduler, master or slave, is destroyed, all are immediately destroyed.