Intel® Fortran Compiler Classic and Intel® Fortran Compiler Developer Guide and Reference

ID 767251
Date 7/13/2023
Public

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MASTER

OpenMP* Fortran Compiler Directive: (Deprecated; see MASKED) Specifies a block of code to be executed by the master thread of the team.

Syntax

!$OMP MASTER

   loosely-structured-block

!$OMP END MASTER

-or-

!$OMP MASTER

   strictly-structured-block

[!$OMP END MASTER]

loosely-structured-block

Is a structured block (section) of statements or constructs. You cannot branch into or out of the block.

strictly-structured-block

Is a Fortran BLOCK construct. You cannot branch into or out of the BLOCK construct.

The binding thread set for a MASTER construct is the current team. A master region binds to the innermost enclosing parallel region.

When the MASTER directive is specified, the other threads in the team skip the enclosed block (section) of code and continue execution. There is no implied barrier, either on entry to or exit from the master section.

The MASTER directive is deprecated; you should use the MASKED directive.

Example

The following example forces the master thread to execute the routines OUTPUT and INPUT:

  !$OMP PARALLEL DEFAULT(SHARED)
        CALL WORK(X)
  !$OMP MASTER
        CALL OUTPUT(X)
        CALL INPUT(Y)
  !$OMP END MASTER
        CALL WORK(Y)
  !$OMP END PARALLEL