MASTER

OpenMP* Fortran Compiler Directive: Specifies a block of code to be executed by the master thread of the team.

構文

c$OMP MASTER

   block

c$OMP END MASTER

c

Is one of the following: C (or c), !, or * (see Syntax Rules for Compiler Directives).

block

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

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

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

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