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psblas3/base/tools/psb_dgetelem.f90

111 lines
4.1 KiB
Fortran

!
! Parallel Sparse BLAS version 3.5
! (C) Copyright 2006-2018
! Salvatore Filippone
! Alfredo Buttari
!
! Redistribution and use in source and binary forms, with or without
! modification, are permitted provided that the following conditions
! are met:
! 1. Redistributions of source code must retain the above copyright
! notice, this list of conditions and the following disclaimer.
! 2. Redistributions in binary form must reproduce the above copyright
! notice, this list of conditions, and the following disclaimer in the
! documentation and/or other materials provided with the distribution.
! 3. The name of the PSBLAS group or the names of its contributors may
! not be used to endorse or promote products derived from this
! software without specific written permission.
!
! THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
! ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
! TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
! PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PSBLAS GROUP OR ITS CONTRIBUTORS
! BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
! CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
! SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
! INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
! CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
! ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
! POSSIBILITY OF SUCH DAMAGE.
!
! Function: psb_d_getelem
! Extract entries from a dense vector. Note: the row indices in index
! are assumed to be in global numbering and are converted on the fly.
! Row indices not belonging to the current process have to be in the halo,
! othewise failure is ensured.
!
! Arguments:
! x - type(psb_d_vect_type) The source vector
! desc_a - type(psb_desc_type). The communication descriptor.
! index - integer. Row index of x of the value to extract
! iam - integer. Index of the process requesting the value
! info - integer. return code
function psb_d_getelem(x,index,desc_a,info) result(res)
use psb_base_mod, psb_protect_name => psb_d_getelem
use psi_mod
implicit none
type(psb_d_vect_type), intent(inout) :: x
type(psb_desc_type), intent(inout) :: desc_a
integer(psb_lpk_), intent(in) :: index
integer(psb_ipk_), intent(out) :: info
real(psb_dpk_) :: res
!locals
integer(psb_ipk_) :: localindex(1)
type(psb_ctxt_type) :: ctxt
integer(psb_ipk_) :: np, me, err_act
integer(psb_lpk_) :: gindex(1)
integer(psb_lpk_), allocatable :: myidx(:),mylocal(:)
character(len=20) :: name
logical, parameter :: debug = .false.
gindex(1) = index
res = dzero
if (psb_errstatus_fatal()) return
info=psb_success_
call psb_erractionsave(err_act)
name = 'psb_d_getelem'
if (.not.desc_a%is_ok()) then
info = psb_err_invalid_cd_state_
call psb_errpush(info,name)
goto 9999
end if
ctxt = desc_a%get_context()
call psb_info(ctxt, me, np)
if (np == -1) then
info = psb_err_context_error_
call psb_errpush(info,name)
goto 9999
endif
call desc_a%indxmap%g2l(gindex,localindex,info,owned=.false.)
if(debug.and.(localindex(1) < 1)) then
write(*,*)"Process ",me," owns ",desc_a%get_local_rows()," rows"," Global index is ",gindex,"Local index is ",localindex
myidx = desc_a%get_global_indices(owned=.false.)
mylocal = desc_a%get_global_indices(owned=.true.)
write(*,*)"My (local+halo) indexes are: ",myidx
write(*,*)"My (local) indexes are: ",mylocal
end if
if ( localindex(1) < 1) then
info = psb_err_internal_error_
call psb_errpush(info,name,a_err="Index not in the HALO")
goto 9999
else
res = x%get_entry(localindex(1))
end if
call psb_erractionrestore(err_act)
return
9999 call psb_error_handler(ctxt,err_act)
return
end function