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omp_get_num_threads – Size of the active teamReturns the number of threads in the current team.  In a sequential section of
the program omp_get_num_threads returns 1.
The default team size may be initialized at startup by the 
OMP_NUM_THREADS environment variable.  At runtime, the size
of the current team may be set either by the NUM_THREADS
clause or by omp_set_num_threads.  If none of the above were
used to define a specific value and OMP_DYNAMIC is disabled,
one thread per CPU online is used.
| Prototype: | int omp_get_num_threads(void); | 
| Interface: | integer function omp_get_num_threads() | 
OpenMP specification v4.5, Section 3.2.2.