RTOS/AM3352: Semaphore priority

Kaka

Part Number: AM3352

Tool/software: TI-RTOS

Hi TI Experts,

Please let me confirm the following questions.
[Question]
Would you please teach me what behavior will the TI-RTOS be with following case?

If you have any question, please let me know.
Best regards.
Kaka

over 5 years ago

0 Ashish Kapania over 5 years ago

TI__Mastermind 21645 points

Hi Kaka,

Answer to Q1: Task A does not get placed on the inactive queue until the timeout happens and the Task is unblocked.

Answer to Q2: The timer continues to run until timeout expires.

Answer to Q3: Task A is unblocked and placed on the inactive queue after the 500ms timeout expires. The Semaphore post from Task B will increment the semaphore count to 1 and does not have any effect on Task A. In other words, Task A semaphore pend fails right after the 500ms timeout expires.

Answer to Q4: Yes

Best,

Ashish

0 Kaka over 5 years ago in reply to Ashish Kapania

Guru 24520 points

Hi Ashish,

Thank you for your response.
I got it
Best regards.
Kaka

0 Kaka over 5 years ago in reply to Kaka

Guru 24520 points

Hi Ashish,

Please let me confirm the following question about Q4, just in case.
Now, Task A is waiting the semaphore and requests to change the state to inactive by Task B. If Task B post the semaphore before the timeout, Task A will change the statue to inactive with having the resource. Is my understanding correct?

Best regards.
Kaka

0 Ashish Kapania over 5 years ago in reply to Kaka

TI__Mastermind 21645 points

Yes, that is correct. Task A effectively owns the semaphore and hence the resource.

0 Kaka over 5 years ago in reply to Ashish Kapania

Guru 24520 points

I see! Thanks!!

Best regards.
Kaka

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RTOS/AM3352: Semaphore priority