psblas3/prec/psb_dprecinit.f90

!!$ 
!!$              Parallel Sparse BLAS  version 2.2
!!$    (C) Copyright 2006/2007/2008
!!$                       Salvatore Filippone    University of Rome Tor Vergata
!!$                       Alfredo Buttari        University of Rome Tor Vergata
!!$ 
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!!$  
subroutine psb_dprecinit(p,ptype,info)

  use psb_base_mod
  use psb_prec_mod, psb_protect_name => psb_dprecinit
  use psb_d_nullprec
  use psb_d_diagprec
  use psb_d_bjacprec
  implicit none
  type(psb_dprec_type), intent(inout)    :: p
  character(len=*), intent(in)           :: ptype
  integer, intent(out)                   :: info

  info = 0

  if (allocated(p%prec) ) then
    call p%prec%precfree(info)
    if (info == 0) deallocate(p%prec,stat=info) 
    if (info /= 0) return
  end if
  
  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(0,*) 'Unknown preconditioner type request "',ptype,'"'
    info = 2
    
  end select
  if (info == 0)  call p%prec%precinit(info)
  
end subroutine psb_dprecinit