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100 lines
4.0 KiB
Fortran
100 lines
4.0 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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!
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! File: psb_iscatter.f90
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!
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! Subroutine: psb_iscatter_vect
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! This subroutine scatters a global vector locally owned by one process
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! into pieces that are local to all the processes.
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!
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! Arguments:
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! globx - integer,dimension(:) The global matrix to scatter.
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! locx - type(psb_i_vect_type) The local piece of the distributed matrix.
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! desc_a - type(psb_desc_type). The communication descriptor.
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! info - integer. Error code.
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! iroot - integer(optional). The process that owns the global matrix.
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! If -1 all the processes have a copy.
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! Default -1
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subroutine psb_iscatter_vect(globx, locx, desc_a, info, root, mold)
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use psb_base_mod, psb_protect_name => psb_iscatter_vect
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implicit none
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type(psb_i_vect_type), intent(inout) :: locx
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integer(psb_ipk_), intent(in) :: globx(:)
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type(psb_desc_type), intent(in) :: desc_a
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integer(psb_ipk_), intent(out) :: info
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integer(psb_ipk_), intent(in), optional :: root
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class(psb_i_base_vect_type), intent(in), optional :: mold
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! locals
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integer(psb_mpk_) :: ictxt, np, me, icomm, myrank, rootrank
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integer(psb_ipk_) :: ierr(5), err_act, m, n, i, j, idx, nrow, iglobx, jglobx,&
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& ilocx, jlocx, lda_locx, lda_globx, k, pos, ilx, jlx
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integer(psb_ipk_), allocatable :: vlocx(:)
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character(len=20) :: name, ch_err
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integer(psb_ipk_) :: debug_level, debug_unit
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name='psb_scatter_vect'
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info=psb_success_
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call psb_erractionsave(err_act)
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if (psb_errstatus_fatal()) then
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info = psb_err_internal_error_ ; goto 9999
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end if
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ictxt=desc_a%get_context()
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debug_unit = psb_get_debug_unit()
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debug_level = psb_get_debug_level()
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! check on blacs grid
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call psb_info(ictxt, 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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if (info == psb_success_) call psb_scatter(globx, vlocx, desc_a, info, root=root)
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if (info /= psb_success_) then
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info = psb_err_from_subroutine_
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call psb_errpush(info,name,a_err='psb_scatterv')
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goto 9999
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endif
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call locx%bld(vlocx,mold=mold)
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call psb_erractionrestore(err_act)
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return
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9999 call psb_error_handler(ione*ictxt,err_act)
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return
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end subroutine psb_iscatter_vect
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