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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
5.2.6
Examples of exclusive control using semaphores
Some examples of exclusive control using semaphores are shown below.
(1) cre_sem is issued creating a semaphore. The value of the initial counter is 1.
(2) For task A to use a resource, wai_sem is issued and a resource is acquired from the semaphore.
Running state
Semaphore X
Request for resource
Count = 1
wai_sem
Task A
Acquisition successful
Running state
Semaphore X
Task A
Count = 0
SEM
(3) For task B to use a resource, wai_sem is issued and an attempt is made to acquire a resource from a
semaphore. However, because the value of the semaphore resource counter is 0, task B is put in the waiting
state and is registered in the semaphore鈥檚 waiting task queue.
Running state
Semaphore X
Request for resource
Count = 0
wai_sem
Task B
Acquisition impossible
Semaphore X
Count = 0
Registration
Waiting state
Task B
48
User鈥檚 Manual U14833EJ2V0UM

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