[feat](pthread): Add pthread_mutex_timedlock

[PlainWaterK]

[Descriptions]:
1. Support POSIX pthread extension function pthread_mutex_timedlock

拉取/合并请求描述：(PR description)

[

添加了pthread_mutex_timedlock接口支持

为什么提交这份PR (why to submit this PR)

POSIX标准中有对该接口的支持和描述

你的解决方案是什么 (what is your solution)

参照pthread_mutex_lock，依据POSIX标准中对该线程库接口的描述，添加pthread_mutex_timedlock，支持带超时的互斥锁获取

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

• BSP:

• .config:

• action:

]

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
• 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:

• 已经仔细查看过代码改动的对比 Already check the difference between PR and old code
• 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
• 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
• 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
• 对难懂代码均提供对应的注释 I've commented appropriately where code is tricky
• 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/workflows/bsp_buildings.yml 详细请参考链接BSP自查

[PlainWaterK]

Is this patch allowed? Could anyone review it?

[Copilot]

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

[Copilot]

The return value from rt_mutex_take is always translated to EINVAL, irrespective of whether the failure was due to a timeout or another error. Consider translating the error codes from rt_mutex_take (for example, returning ETIMEDOUT when the timeout expires) to provide more accurate feedback to the caller.

[Copilot]

Pull Request Overview

This PR adds support for the POSIX pthread extension function pthread_mutex_timedlock, enabling mutex acquisition with a timeout based on an absolute timespec.

• Adds implementation of pthread_mutex_timedlock in pthread_mutex.c.
• Updates pthread.h with the function prototype for pthread_mutex_timedlock.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
components/libc/posix/pthreads/pthread_mutex.c	Added implementation of pthread_mutex_timedlock with timeout support.
components/libc/posix/pthreads/pthread.h	Added function prototype for pthread_mutex_timedlock.

[Copilot]

When rt_mutex_take fails due to a timeout, returning EINVAL may be misleading. Consider checking if the error indicates a timeout and returning ETIMEDOUT as specified by the POSIX standard.

Suggested change

	return 0;
	return 0;
	else if (result == -RT_ETIMEOUT) /* Assuming -RT_ETIMEOUT indicates a timeout */
	return ETIMEDOUT;