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3.4.3 Task Priority and Waiting Queue

In The standard profiles in µITRON 4.0 Specification support two waiting methods for each object. In one method, tasks

are placed in a waiting queue in order of priority (TA_TPRI attribute); in another, tasks are placed in a waiting queue in

order of FIFO (TA_TFIFO).

Figure 3.18 and Figure 3.19 depict the manner in which tasks are placed in a

waiting queue in order of "taskD," "taskC,"

"taskA," and "taskB."

Priority 1 Priority 5 Priority 6

taskB

ID No.

taskA taskC taskD

Priority 9

Figure 3.18 Waiting queue of the TA_TPRI attribute

Priority 9 Priority 6 Priority 1

taskC

ID No.

taskD taskA taskB

Priority 5

Figure 3.19 Waiting queue of the TA_TFIFO attribute

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 ... 303 304

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