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OpenMP Directives: Data Scope Attribute Clauses: DEFAULT Clause

Purpose:

The DEFAULT clause allows the user to specify a default scope for all variables in the lexical extent of any parallel region.

Format:

Fortran

DEFAULT (PRIVATE | FIRSTPRIVATE | SHARED | NONE)

C/C++

default (shared | none)

Notes:

  • Specific variables can be exempted from the default using the PRIVATE, SHARED, FIRSTPRIVATE, LASTPRIVATE, and REDUCTION clauses.

  • The C/C++ OpenMP specification does not include private or firstprivate as a possible default. However, actual implementations may provide this option.

  • Using NONE as a default requires that the programmer explicitly scope all variables.

Restrictions:

Only one DEFAULT clause can be specified on a PARALLEL directive.

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