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omp_get_ancestor_thread_num – Ancestor thread IDThis 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.
| Prototype: | int omp_get_ancestor_thread_num(int level); | 
| Interface: | integer function omp_get_ancestor_thread_num(level) | 
| integer level | 
OpenMP specification v4.5, Section 3.2.18.