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2.2 omp_get_ancestor_thread_num – Ancestor thread ID

Description:
This function returns the thread identification number for the given nesting level of the current thread. For values of level outside zero to omp_get_level -1 is returned; if level is omp_get_level the result is identical to omp_get_thread_num.
C/C++

Prototype: int omp_get_ancestor_thread_num(int level);

Fortran:

Interface: integer omp_ancestor_thread_num(level)
integer level

See also:
omp_get_level, omp_get_thread_num, omp_get_team_size
Reference:
OpenMP specifications v3.0, section 3.2.17.