Update task management logic

Oct 13, 2025 by pinkandtrash.com 67 views

Introduction

In the context of task management, it is crucial to understand the reason behind a task's wake-up. This information can be vital in determining the course of action for the task, especially when it comes to handling external events. The current implementation of tk_dly_tsk does not store the wake-up reason, making it challenging to differentiate between normal timeout expiration and external events such as tk_rel_wai. To address this limitation, we propose a refactor to store the wake-up reason in the Task Control Block (TCB) structure for tk_dly_tsk.

Description

The proposed refactor involves adding a new member to the TCB structure to store the wake-up reason. This will enable tasks to determine whether they were woken up due to normal timeout expiration or due to an external event such as tk_rel_wai. The updated TCB structure will include a wakeup_reason field, which will be set by the task management logic before resuming execution.

Expected Behavior

Wakeup Reason Storage: tk_dly_tsk should store the wake-up reason in the TCB before resuming execution.
External Event Handling: If a task is released by tk_rel_wai, it should receive E_RLWAI as the wake-up reason.
Normal Timeout Expiration: If a task wakes up normally after a timeout, it should receive E_OK.
System Call Compatibility: This update should not affect other system calls that handle task waiting and waking.

Acceptance Criteria

To ensure the successful implementation of the proposed refactor, the following acceptance criteria must be met:

TCB Structure Update: Add a wakeup_reason field to the TCB structure.
tk_dly_tsk Modification: Modify tk_dly_tsk to store E_OK when waking up normally.
tk_rel_wai Modification: Modify tk_rel_wai to set E_RLWAI in the TCB before waking the task.
Wakeup Reason Checking: Ensure that the wake-up reason is properly checked and returned by tk_dly_tsk.
Unit Testing: Validate correct functionality with unit tests.

Task Breakdown

To implement the proposed refactor, the following tasks must be completed:

[ ] Add wakeup_reason field to TCB structure.
[ ] Modify tk_dly_tsk to store E_OK before waking the task.
[ ] Modify tk_rel_wai to set E_RLWAI before waking the task.
[ ] Update task management logic to properly check and return the wake-up reason.
[ ] Write unit tests to verify wake-up reasons are correctly set and handled.
[ ] Ensure existing tests for tk_dly_tsk still pass without regression.

Implementation Details

To implement the proposed refactor, the following steps must be taken:

Add wakeup_reason field to TCB structure: Update the TCB structure to include a new member wakeup_reason of type enum wake_up_reason.
Modify tk_dly_tsk to store E_OK: Update tk_dly_tsk to store E_OK in the wakeup_reason field of the TCB before waking the task.
Modify tk_rel_wai to set E_RLWAI: Update tk_rel_wai to set E_RLWAI in the wakeup_reason field of the TCB before waking the task.
Update task management logic: Update the task management logic to properly check and return the wake-up reason stored in the TCB.
Write unit tests: Write unit tests to verify that the wake-up reason is correctly set and handled by tk_dly_tsk and tk_rel_wai.
Ensure existing tests pass without regression: Ensure that the existing tests for tk_dly_tsk still pass without regression after the implementation of the proposed refactor.

Conclusion

Introduction

In our previous article, we discussed the proposed refactor to store the wake-up reason in the Task Control Block (TCB) structure for tk_dly_tsk. This refactor aims to enable tasks to determine whether they were woken up due to normal timeout expiration or due to an external event such as tk_rel_wai. In this article, we will address some frequently asked questions (FAQs) related to the proposed refactor.

Q: What is the purpose of storing the wake-up reason in the TCB?

A: The purpose of storing the wake-up reason in the TCB is to enable tasks to determine whether they were woken up due to normal timeout expiration or due to an external event such as tk_rel_wai. This information can be vital in determining the course of action for the task.

Q: How will the wake-up reason be stored in the TCB?

A: The wake-up reason will be stored in a new member of the TCB structure, specifically in the wakeup_reason field. This field will be set by the task management logic before resuming execution.

Q: What are the expected behaviors of `tk_dly_tsk` and `tk_rel_wai` after the refactor?

A: After the refactor, tk_dly_tsk should store E_OK in the wakeup_reason field of the TCB when waking up normally. tk_rel_wai should set E_RLWAI in the wakeup_reason field of the TCB before waking the task.

Q: Will the refactor affect other system calls that handle task waiting and waking?

A: No, the refactor will not affect other system calls that handle task waiting and waking. The update will be isolated to the tk_dly_tsk and tk_rel_wai system calls.

Q: How will the wake-up reason be checked and returned by `tk_dly_tsk`?

A: The wake-up reason will be checked and returned by tk_dly_tsk by accessing the wakeup_reason field of the TCB.

Q: What are the acceptance criteria for the refactor?

A: The acceptance criteria for the refactor include:

Adding a wakeup_reason field to the TCB structure.
Modifying tk_dly_tsk to store E_OK in the wakeup_reason field of the TCB.
Modifying tk_rel_wai to set E_RLWAI in the wakeup_reason field of the TCB.
Ensuring that the wake-up reason is properly checked and returned by tk_dly_tsk.
Validating correct functionality with unit tests.

Q: What are the task breakdown steps for implementing the refactor?

A: The task breakdown steps for implementing the refactor include:

Adding a wakeup_reason field to the TCB structure.
Modifying tk_dly_tsk to store E_OK in the wakeup_reason field of the TCB.
Modifying tk_rel_wai to set E_RLWAI in the wakeup_reason field of the TCB.
Updating the task management logic to properly check and return the wake-up reason.
Writing unit tests to verify that the wake-up reason is correctly set and handled.
Ensuring that existing tests for tk_dly_tsk still pass without regression.

Conclusion

The proposed refactor to store the wake-up reason in the TCB for tk_dly_tsk aims to enable tasks to determine whether they were woken up due to normal timeout expiration or due to an external event such as tk_rel_wai. The FAQs addressed in this article provide a better understanding of the proposed refactor and its implementation details.