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47 lines
1.1 KiB
Fortran
47 lines
1.1 KiB
Fortran
! @@name: reproducible.1
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! @@type: F-free
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! @@compilable: yes
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! @@linkable: yes
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! @@expect: success
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! @@version: omp_5.0
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program main
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use omp_lib
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implicit none
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integer, parameter :: n = 1000
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integer :: v(n), u(n)
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integer :: i
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integer, save :: sum
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!$omp threadprivate(sum)
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!! no data dependences, so can execute concurrently
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!$omp parallel do order(concurrent)
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do i = 1, n
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u(i) = i
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v(i) = i
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v(i) = v(i) + u(i) * u(i)
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end do
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!! with data dependences, so cannot execute iterations
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!! concurrently with the order(concurrent) clause
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!$omp parallel do ordered
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do i = 2, n
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v(i) = v(i) + u(i) * u(i)
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!$omp ordered
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v(i) = v(i) + v(i-1)
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!$omp end ordered
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end do
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sum = 0
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!! accessing a threadprivate variable, which would not be
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!! permitted if the order(concurrent) clause was present
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!$omp parallel do copyin(sum)
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do i = 2, n
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sum = sum + v(i)
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end do
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!$omp parallel
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print *,"sum = ",sum," on thread ", omp_get_thread_num()
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!$omp end parallel
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end program
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