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RX4000V4 Datasheet

  • RX4000V4

  • RX4000(uITRON4.0) Basics User＇s Manual | User＇s Manual[02/...

  • 309頁

  • ETC

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CHAPTER 5 SYNCHRONOUS COMMUNICATION MANAGEMENT
(4) In order to use a resource, task A attempts to lock mutex X. At this time, if the mutex does not support the
priority inheritance protocol, task A will fail to lock the mutex, and enter the waiting state, at which point
processing will shift to task B. Because task C cannot be executed until the processing of task B is complete,
task A must wait for task B, which has a lower priority than itself, to be executed (despite the fact task B is not
locking a mutex).
Higher priority
Locks mutex X
鈫?/div>
Enters the waiting state
Task A
Task B
Resumption of task A execution occurs at
impossible to predict priority inversion period
Task C
Time
In actual fact, however, as soon as task A enters the waiting state after failing to lock the mutex, priority
inheritance occurs and task C鈥檚 priority is raised to that of task A. Consequently, because the processing of
task C, which is locking the mutex, now has a higher priority than that of task B, the period in which a task with
a lower priority than task A is being executed is minimized.
Locks mutex X
鈫?/div>
Enters the waiting state
Higher priority
Mutex lock released
Task A
Task B
Task C
Inherits the priority of task A
End of inheritance
Time
68
User鈥檚 Manual U14833EJ2V0UM

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  • 英文版
    RX4000(uITRON4.0) Basics User＇s Manual | User＇s Manual[02/...
    ETC
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    RX4000(uITRON4.0) Basics User＇s Manual | User＇s Manual[02/...

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