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