GNU libgomp: omp_get_num_procs

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### 2.12 `omp_get_num_procs` – Number of processors online

Description:

  Returns the number of processors online on that device.

C/C++:

  Prototype: | `int omp_get_num_procs(void);`

Fortran:

  Interface: | `integer function omp_get_num_procs()`

Reference:

  OpenMP specification v4.5, Section 3.2.5.