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48 lines
1.0 KiB
Fortran
48 lines
1.0 KiB
Fortran
! @@name: task_dep.4b
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! @@type: F-free
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! @@operation: compile
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! @@expect: success
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! @@version: omp_5.1
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subroutine task_dep(N)
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implicit none
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integer :: N
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integer :: i, v, R
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integer, external :: f
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!$omp parallel private(i,v) shared(R)
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!$omp single
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!! CASE 1: tasks with inout dependence type.
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!! tasks are serialized here.
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R = 0
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do i = 1, N
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!$omp task depend(inout: R) !! T1
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v = f(i)
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R = R + v
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!$omp end task
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end do
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!$omp task depend(in: R) !! T2
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print *, "result is ", R
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!$omp end task
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!$omp taskwait !! to avoid race with CASE 2
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!! CASE 2: tasks with inoutset dependence type.
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!! tasks are executed concurrently.
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R = 0
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do i = 1, N
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!$omp task depend(inoutset: R) !! T3
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v = f(i)
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!$omp atomic
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R = R + v
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!$omp end task
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end do
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!$omp task depend(in: R) !! T4
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print *, "result is ", R
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!$omp end task
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!$omp end single
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!$omp end parallel
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end subroutine
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