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psblas3/base/comm/psb_iscatter.F90

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