[kernel]fix thread error code to avoid spurious error display in list_thread.

[Rbb666]

拉取/合并请求描述：(PR description)

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为什么提交这份PR (why to submit this PR)

修复如下issue的问题： https://github.com/RT-Thread/rt-thread/issues/6768

你的解决方案是什么 (what is your solution)

添加哨兵标记线程状态，用于检测线程的状态码是否被IPC/信号的唤醒机制修改

请提供验证的bsp和config (provide the config and bsp)

• BSP: QEMU-A9

]

当前拉取/合并请求的状态 Intent for your PR

必须选择一项 Choose one (Mandatory):

• [ ] 本拉取/合并请求是一个草稿版本 This PR is for a code-review and is intended to get feedback
• [x] 本拉取/合并请求是一个成熟版本 This PR is mature, and ready to be integrated into the repo

代码质量 Code Quality：

我在这个拉取/合并请求中已经考虑了 As part of this pull request, I've considered the following:

• [x] 已经仔细查看过代码改动的对比 Already check the difference between PR and old code
• [x] 代码风格正确，包括缩进空格，命名及其他风格 Style guide is adhered to, including spacing, naming and other styles
• [x] 没有垃圾代码，代码尽量精简，不包含#if 0代码，不包含已经被注释了的代码 All redundant code is removed and cleaned up
• [x] 所有变更均有原因及合理的，并且不会影响到其他软件组件代码或BSP All modifications are justified and not affect other components or BSP
• [x] 对难懂代码均提供对应的注释 I've commented appropriately where code is tricky
• [x] 代码是高质量的 Code in this PR is of high quality
• [ ] 已经使用formatting 等源码格式化工具确保格式符合RT-Thread代码规范 This PR complies with RT-Thread code specification
• [ ] 如果是新增bsp, 已经添加ci检查到.github/ALL_BSP_COMPILE.json 详细请参考链接BSP自查

[github-actions[bot]]

👋 感谢您对 RT-Thread 的贡献！Thank you for your contribution to RT-Thread!

为确保代码符合 RT-Thread 的编码规范，请在你的仓库中执行以下步骤运行代码格式化工作流（如果格式化CI运行失败）。 To ensure your code complies with RT-Thread's coding style, please run the code formatting workflow by following the steps below (If the formatting of CI fails to run).

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🛠 操作步骤 | Steps

1. 前往 Actions 页面 | Go to the Actions page 点击进入工作流 → | Click to open workflow →

2. 点击 Run workflow | Click Run workflow

• 设置需排除的文件/目录（目录请以"/"结尾） Set files/directories to exclude (directories should end with "/")
• 将目标分支设置为 \ Set the target branch to：fix-thread-error-status
• 设置PR number为 \ Set the PR number to：10972

3. 等待工作流完成 | Wait for the workflow to complete 格式化后的代码将自动推送至你的分支。 The formatted code will be automatically pushed to your branch.

完成后，提交将自动更新至 fix-thread-error-status 分支，关联的 Pull Request 也会同步更新。 Once completed, commits will be pushed to the fix-thread-error-status branch automatically, and the related Pull Request will be updated.

如有问题欢迎联系我们，再次感谢您的贡献！💐 If you have any questions, feel free to reach out. Thanks again for your contribution!

[github-actions[bot]]

📌 Code Review Assignment

🏷️ Tag: kernel

Reviewers: GorrayLi ReviewSun hamburger-os lianux-mm wdfk-prog xu18838022837

Changed Files (Click to expand)

• src/ipc.c
• src/klibc/kerrno.c
• src/thread.c

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📊 Current Review Status (Last Updated: 2025-11-23 22:35 CST)

• ⌛ GorrayLi Pending Review
• ⌛ ReviewSun Pending Review
• ⌛ hamburger-os Pending Review
• ⌛ lianux-mm Pending Review
• ⌛ wdfk-prog Pending Review
• ⌛ xu18838022837 Pending Review

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📝 Review Instructions

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3. PR合并前需至少一位维护者确认 PR must be confirmed by at least one maintainer before merging

ℹ️ 刷新CI状态操作需要具备仓库写入权限。 ℹ️ Refresh CI status operation requires repository Write permission.