20 lines
543 B
Fortran
20 lines
543 B
Fortran
subroutine scalprod(n, x_p, y_p, res) bind(c)
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use iso_c_binding
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implicit none
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integer(c_int), intent(in), value :: n
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type(c_ptr), intent(in), value :: x_p, y_p
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real(c_double), pointer :: x(:), y(:)
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integer :: i
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real(c_double) :: res
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real(c_double) :: scalpt = 0
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call c_f_pointer(x_p, x, shape=[n])
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call c_f_pointer(y_p, y, shape=[n])
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res = 0
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!$omp parallel do private(scalpt), reduction(+:res)
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do i=1,n
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scalpt = y(i) * x(i)
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res = res + scalpt
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end do
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end subroutine scalprod
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