c functions pthread_mutex_lock / pthread_setspecific are implemented in RHEL8.1?

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I want to know if these c functions are implemented in RHEL8.1 or not.
- pthread_mutex_lock
- pthread_setspecific

If implemented, where can I find manuals for them?
manpage says as follows;

PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementa‐
tion of this interface may differ (consult the corresponding Linux manual page for
details of Linux behavior), or the interface may not be implemented on Linux.

TN

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