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psblas3/base/tools/psb_get_overlap.f90

100 lines
3.4 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_get_overlap.f90
!
! Subroutine: psb_get_overlap
! Extracts a list of overlap indices. If no overlap is present in
! the distribution the output vector is put in the unallocated state,
! otherwise its size is equal to the number of overlap indices on the
! current (calling) process.
!
! Arguments:
! ovrel(:) - integer(psb_ipk_), allocatable Array containing the output list
! desc_a - type(psb_desc_type). The communication descriptor.
! info - integer. return code.
!
subroutine psb_get_ovrlap(ovrel,desc,info)
use psb_base_mod, psb_protect_name => psb_get_ovrlap
implicit none
integer(psb_ipk_), allocatable, intent(out) :: ovrel(:)
type(psb_desc_type), intent(in) :: desc
integer(psb_ipk_), intent(out) :: info
integer(psb_ipk_) :: i,j, err_act
character(len=20) :: name
info = psb_success_
name='psi_get_overlap'
call psb_erractionsave(err_act)
if (.not.desc%is_asb()) then
info = psb_err_invalid_cd_state_
call psb_errpush(info,name)
goto 9999
end if
if (allocated(desc%ovrlap_elem) ) then
i=size(desc%ovrlap_elem,1)
allocate(ovrel(i),stat=info)
if (info /= psb_success_ ) then
info = psb_err_alloc_dealloc_
call psb_errpush(info,name)
goto 9999
end if
do j=1,i
ovrel(j) = desc%ovrlap_elem(j,1)
end do
else
if (allocated(ovrel)) then
deallocate(ovrel,stat=info)
if (info /= psb_success_) then
call psb_errpush(psb_err_from_subroutine_,name,a_err='Deallocate')
goto 9999
end if
end if
end if
call psb_erractionrestore(err_act)
return
9999 call psb_error_handler(err_act)
return
end subroutine psb_get_ovrlap