GNU libgomp: OMP_MAX_ACTIVE_LEVELS

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### 3.5 `OMP_MAX_ACTIVE_LEVELS` – Set the maximum number of nested parallel regions

Description:

  Specifies the initial value for the maximum number of nested parallel regions. The value of this variable shall be a positive integer. If undefined, the number of active levels is unlimited.

See also:

  omp_set_max_active_levels

Reference:

  OpenMP specification v4.5, Section 4.9