add comments for pthread barrier APIs and fix some errors.#9685

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mysterywolf merged 3 commits intoRT-Thread:masterfrom

GorrayLi:master

Nov 22, 2024

Commits on Nov 21, 2024

[components/libc/posix]add comments for barrier APIs.
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[components/libc/posix]fix the errors that assigning an integer to a pointer and always return EINVAL.
GorrayLi
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[components/libc/posix]fix the problem that it doesn't check if barrier still in use and dosen't destory the mutex either.
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