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https://github.com/OpenMP/Examples.git
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37 lines
965 B
Fortran
37 lines
965 B
Fortran
! @@name: master.1f
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! @@type: F-fixed
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! @@compilable: yes
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! @@linkable: no
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! @@expect: success
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SUBROUTINE MASTER_EXAMPLE( X, XOLD, N, TOL )
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REAL X(*), XOLD(*), TOL
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INTEGER N
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INTEGER C, I, TOOBIG
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REAL ERROR, Y, AVERAGE
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EXTERNAL AVERAGE
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C = 0
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TOOBIG = 1
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!$OMP PARALLEL
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DO WHILE( TOOBIG > 0 )
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!$OMP DO PRIVATE(I)
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DO I = 2, N-1
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XOLD(I) = X(I)
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ENDDO
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!$OMP SINGLE
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TOOBIG = 0
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!$OMP END SINGLE
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!$OMP DO PRIVATE(I,Y,ERROR), REDUCTION(+:TOOBIG)
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DO I = 2, N-1
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Y = X(I)
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X(I) = AVERAGE( XOLD(I-1), X(I), XOLD(I+1) )
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ERROR = Y-X(I)
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IF( ERROR > TOL .OR. ERROR < -TOL ) TOOBIG = TOOBIG+1
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ENDDO
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!$OMP MASTER
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C = C + 1
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PRINT *, 'Iteration ', C, 'TOOBIG=', TOOBIG
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!$OMP END MASTER
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ENDDO
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!$OMP END PARALLEL
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END SUBROUTINE MASTER_EXAMPLE
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