From cppreference.com
thrd_tthrd_current(void);(since C11)Returns the identifier of the calling thread.
Parameters
(none)
Return value
The identifier of the calling thread.
References
C17 standard (ISO/IEC 9899:2018):
7.26.5.2 The thrd_current function (p: 279)
C11 standard (ISO/IEC 9899:2011):
7.26.5.2 The thrd_current function (p: 383)
See also