You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
psblas3/prec/impl/psb_dprecinit.f90

74 lines
2.9 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.
!
!
subroutine psb_dprecinit(ctxt,p,ptype,info)
use psb_base_mod
use psb_d_prec_type, psb_protect_name => psb_dprecinit
use psb_d_nullprec, only : psb_d_null_prec_type
use psb_d_diagprec, only : psb_d_diag_prec_type
use psb_d_bjacprec, only : psb_d_bjac_prec_type
implicit none
type(psb_ctxt_type), intent(in) :: ctxt
class(psb_dprec_type), intent(inout) :: p
character(len=*), intent(in) :: ptype
integer(psb_ipk_), intent(out) :: info
info = psb_success_
if (allocated(p%prec) ) then
call p%prec%free(info)
if (info == psb_success_) deallocate(p%prec,stat=info)
if (info /= psb_success_) return
end if
p%ctxt = ctxt
select case(psb_toupper(ptype(1:len_trim(ptype))))
case ('NONE','NOPREC')
allocate(psb_d_null_prec_type :: p%prec, stat=info)
case ('DIAG')
allocate(psb_d_diag_prec_type :: p%prec, stat=info)
case ('BJAC')
allocate(psb_d_bjac_prec_type :: p%prec, stat=info)
case default
write(psb_err_unit,*) 'Unknown preconditioner type request "',ptype,'"'
info = psb_err_invalid_preca_
end select
if (info == psb_success_) call p%prec%precinit(info)
end subroutine psb_dprecinit