omp_set_nested (3f)

enables or disables nested parallelism

Syntax

  interface
     subroutine omp_set_nested ( enable )
     logical enable
     end subroutine omp_set_nested
  end interface
  logical scalar_logical_expression
  call omp_set_nested ( scalar_logical_expression )

Description

  If the value of the scalar logical expression is FALSE, nested parallelism
  is disabled, and nested parallel regions are serialized and executed by the
  current thread.  This is the default.

  If the value of the scalar logical expression is set to TRUE, nested
  parallelism is enabled, and parallel regions that are nested can deploy
  additional threads to form the team.

  When nested parallelism is enabled, the number of threads used to execute
  the nested parallel regions is implementation dependent. This lets
  implementations that comply with the OpenMP standard serialize nested
  parallel regions, even when nested parallelism is enabled.

  A call to omp_set_nested has precedence over the OMP_NESTED environment
  variable.

See Also

  omp_get_nested(3f)