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Providing RR Scheduling in MicroC/OS-II

Providing RR Scheduling in MicroC/OS-II. RR Scheduling in MicroC/OS-II. Goal: providing RR scheduling for MicroC/OS-II MicroC/OS-Ⅱ 作業系統提供 priority based 的 CPU 排程方式 在某些情形下，系統會在 Ready List 中尋找 priority 值最低的 Task Task 執行 semaphore 的 OSSemPend() 動作 Task 執行 mailbox 的 OSMboxPend() 動作

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Providing RR Scheduling in MicroC/OS-II

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  1. Providing RR Scheduling in MicroC/OS-II

  2. RR Scheduling in MicroC/OS-II • Goal: providing RR scheduling for MicroC/OS-II • MicroC/OS-Ⅱ作業系統提供priority based 的CPU排程方式 • 在某些情形下，系統會在Ready List中尋找priority值最低的Task • Task執行semaphore的OSSemPend()動作 • Task執行mailbox的OSMboxPend()動作 • Task執行flag的OSFlagPend()動作 • Task執行message queue的OSQPend()動作 • Task被其他Task suspend • Task執行OSTimeDly()函式，讓Task在使用者設定的時間內暫時不執行

  3. RR Scheduling in MicroC/OS-II (Cont.) • 所有的Task可以分為下列四類： • Priority Task： • 一般按照priority base排程的Task； • Priority值0~30是屬於這一類型的task。 • Round-Robin Task： • 只有當Task的Time Slice＞0且Ready List內沒有可執行的priority base的task； • Priority值 31~61屬於這一類型的Task。 • Statistic Task (priority 62)： • 用來統計系統其他Task的資源使用狀態。 • Idle Task (priority 63)： • 當系統沒有其他Task執行時，idle Task就被呼叫執行。

  4. RR Scheduling in MicroC/OS-II (Cont.) • 本實驗可能新增全域變數、結構 、函示如下列： • #define SLICE x • 採用Round-Robin排程Task的執行時間 • struct os_tcb • OSTimeTick() • OS_Sched() • FindNextTask()

  5. RR Scheduling in MicroC/OS-II (Cont.) • Deadline • 12/29 • Demo to the TA

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