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46 lines
971 B
Fortran
46 lines
971 B
Fortran
! @@name: task_reduction.2
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! @@type: F-free
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! @@operation: run
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! @@expect: success
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! @@version: omp_5.0
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program task_modifier
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integer :: N=100, M=10
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integer :: i, x
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! USE CASE 1 explicit-task reduction + parallel reduction clause
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x=0
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!$omp parallel num_threads(M) reduction(task,+:x)
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x=x+1 !! implicit task reduction statement
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!$omp single
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do i = 1,N
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!$omp task in_reduction(+:x)
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x=x+1
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!$omp end task
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end do
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!$omp end single
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!$omp end parallel
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write(*,'("x=",I0," =M+N")') x ! x= 110 =M+N
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! USE CASE 2 task reduction + worksharing reduction clause
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x=0
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!$omp parallel do num_threads(M) reduction(task,+:x)
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do i = 1,N
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x=x+1
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if( mod(i,2) == 0) then
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!$omp task in_reduction(+:x)
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x=x-1
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!$omp end task
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endif
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end do
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write(*,'("x=",I0," =N-N/2")') x ! x= 50 =N-N/2
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end program
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