Книга: Real-Time Concepts for Embedded Systems

5.7 Points to Remember

5.7 Points to Remember

Some points to remember include the following:

· Most real-time kernels provide task objects and task-management services that allow developers to meet the requirements of real-time applications.

· Applications can contain system tasks or user-created tasks, each of which has a name, a unique ID, a priority, a task control block (TCB), a stack, and a task routine.

· A real-time application is composed of multiple concurrent tasks that are independent threads of execution, competing on their own for processor execution time.

· Tasks can be in one of three primary states during their lifetime: ready, running, and blocked.

· Priority-based, preemptive scheduling kernels that allow multiple tasks to be assigned to the same priority use task-ready lists to help scheduled tasks run.

· Tasks can run to completion or can run in an endless loop. For tasks that run in endless loops, structure the code so that the task blocks, which allows lower priority tasks to run.

· Typical task operations that kernels provide for application development include task creation and deletion, manual task scheduling, and dynamic acquisition of task information.

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