!   
!                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.
!   
!    
module psi_c_collective_mod
  use psi_penv_mod


  interface psb_sum
    module procedure psb_csums, psb_csumv, psb_csumm, &
         & psb_csums_ec, psb_csumv_ec, psb_csumm_ec
  end interface

  interface psb_amx
    module procedure psb_camxs, psb_camxv, psb_camxm, &
         & psb_camxs_ec, psb_camxv_ec, psb_camxm_ec
  end interface

  interface psb_amn
    module procedure psb_camns, psb_camnv, psb_camnm, &
         & psb_camns_ec, psb_camnv_ec, psb_camnm_ec
  end interface


  interface psb_bcast
    module procedure psb_cbcasts, psb_cbcastv, psb_cbcastm, &
         & psb_cbcasts_ec, psb_cbcastv_ec, psb_cbcastm_ec
  end interface psb_bcast

  interface psb_scan_sum
    module procedure psb_cscan_sums, psb_cscan_sumv
  end interface psb_scan_sum

  interface psb_exscan_sum
    module procedure psb_cexscan_sums, psb_cexscan_sumv
  end interface psb_exscan_sum




contains 

  ! !!!!!!!!!!!!!!!!!!!!!!
  !
  ! Reduction operations
  !
  ! !!!!!!!!!!!!!!!!!!!!!!



  !
  ! SUM
  !

  subroutine psb_csums(ictxt,dat,root)
#ifdef MPI_MOD
    use mpi
#endif
    implicit none 
#ifdef MPI_H
    include 'mpif.h'
#endif
    integer(psb_mpk_), intent(in)              :: ictxt
    complex(psb_spk_), intent(inout)  :: dat
    integer(psb_mpk_), intent(in), optional    :: root
    integer(psb_mpk_) :: root_
    complex(psb_spk_) :: dat_
    integer(psb_mpk_) :: iam, np, info
    integer(psb_ipk_) :: iinfo


#if !defined(SERIAL_MPI)
    call psb_info(ictxt,iam,np)

    if (present(root)) then 
      root_ = root
    else
      root_ = -1
    endif
    if (root_ == -1) then 
      call mpi_allreduce(dat,dat_,1,psb_mpi_c_spk_,mpi_sum,ictxt,info)
      dat = dat_
    else
      call mpi_reduce(dat,dat_,1,psb_mpi_c_spk_,mpi_sum,root_,ictxt,info)
      if (iam == root_) dat = dat_
    endif
#endif    
  end subroutine psb_csums

  subroutine psb_csumv(ictxt,dat,root)
    use psb_realloc_mod
#ifdef MPI_MOD
    use mpi
#endif
    implicit none 
#ifdef MPI_H
    include 'mpif.h'
#endif
    integer(psb_mpk_), intent(in)              :: ictxt
    complex(psb_spk_), intent(inout)  :: dat(:)
    integer(psb_mpk_), intent(in), optional    :: root
    integer(psb_mpk_) :: root_
    complex(psb_spk_), allocatable :: dat_(:)
    integer(psb_mpk_) :: iam, np,  info
    integer(psb_ipk_) :: iinfo


#if !defined(SERIAL_MPI)
    call psb_info(ictxt,iam,np)

    if (present(root)) then 
      root_ = root
    else
      root_ = -1
    endif
    if (root_ == -1) then 
      call psb_realloc(size(dat),dat_,iinfo)
      dat_ = dat
      if (iinfo == psb_success_) &
           & call mpi_allreduce(dat_,dat,size(dat),psb_mpi_c_spk_,mpi_sum,ictxt,info)
    else
      if (iam == root_) then 
        call psb_realloc(size(dat),dat_,iinfo)
        dat_ = dat
        call mpi_reduce(dat_,dat,size(dat),psb_mpi_c_spk_,mpi_sum,root_,ictxt,info)
      else
        call psb_realloc(1,dat_,iinfo)
        call mpi_reduce(dat,dat_,size(dat),psb_mpi_c_spk_,mpi_sum,root_,ictxt,info)
      end if
    endif
#endif    
  end subroutine psb_csumv

  subroutine psb_csumm(ictxt,dat,root)
    use psb_realloc_mod
#ifdef MPI_MOD
    use mpi
#endif
    implicit none 
#ifdef MPI_H
    include 'mpif.h'
#endif
    integer(psb_mpk_), intent(in)              :: ictxt
    complex(psb_spk_), intent(inout)  :: dat(:,:)
    integer(psb_mpk_), intent(in), optional    :: root
    integer(psb_mpk_) :: root_
    complex(psb_spk_), allocatable :: dat_(:,:)
    integer(psb_mpk_) :: iam, np,  info
    integer(psb_ipk_) :: iinfo

#if !defined(SERIAL_MPI)

    call psb_info(ictxt,iam,np)

    if (present(root)) then 
      root_ = root
    else
      root_ = -1
    endif
    if (root_ == -1) then 
      call psb_realloc(size(dat,1),size(dat,2),dat_,iinfo)
      dat_ = dat
      if (iinfo == psb_success_)&
           & call mpi_allreduce(dat_,dat,size(dat),psb_mpi_c_spk_,mpi_sum,ictxt,info)
    else
      if (iam == root_) then 
        call psb_realloc(size(dat,1),size(dat,2),dat_,iinfo)
        dat_ = dat
        call mpi_reduce(dat_,dat,size(dat),psb_mpi_c_spk_,mpi_sum,root_,ictxt,info)
      else
        call psb_realloc(1,1,dat_,iinfo)
        call mpi_reduce(dat,dat_,size(dat),psb_mpi_c_spk_,mpi_sum,root_,ictxt,info)
      end if
    endif
#endif    
  end subroutine psb_csumm

  subroutine psb_csums_ec(ictxt,dat,root)
    implicit none 
    integer(psb_epk_), intent(in)              :: ictxt
    complex(psb_spk_), intent(inout)  :: dat
    integer(psb_epk_), intent(in), optional    :: root
    integer(psb_mpk_) :: ictxt_, root_

    ictxt_ = ictxt
    if (present(root)) then 
      root_ = root
      call psb_sum(ictxt_,dat,root_)
    else
      call psb_sum(ictxt_,dat)
    end if
  end subroutine psb_csums_ec

  subroutine psb_csumv_ec(ictxt,dat,root)
    implicit none 
    integer(psb_epk_), intent(in)              :: ictxt
    complex(psb_spk_), intent(inout)  :: dat(:)
    integer(psb_epk_), intent(in), optional    :: root
    integer(psb_mpk_) :: ictxt_, root_

    ictxt_ = ictxt
    if (present(root)) then 
      root_ = root
      call psb_sum(ictxt_,dat,root_)
    else
      call psb_sum(ictxt_,dat)
    end if
  end subroutine psb_csumv_ec
  
  subroutine psb_csumm_ec(ictxt,dat,root)
    implicit none 
    integer(psb_epk_), intent(in)              :: ictxt
    complex(psb_spk_), intent(inout)  :: dat(:,:)
    integer(psb_epk_), intent(in), optional    :: root
    integer(psb_mpk_) :: ictxt_, root_

    ictxt_ = ictxt
    if (present(root)) then 
      root_ = root
      call psb_sum(ictxt_,dat,root_)
    else
      call psb_sum(ictxt_,dat)
    end if
  end subroutine psb_csumm_ec


  !
  ! AMX: Maximum Absolute Value
  !
  
  subroutine psb_camxs(ictxt,dat,root)
#ifdef MPI_MOD
    use mpi
#endif
    implicit none 
#ifdef MPI_H
    include 'mpif.h'
#endif
    integer(psb_mpk_), intent(in)              :: ictxt
    complex(psb_spk_), intent(inout)  :: dat
    integer(psb_mpk_), intent(in), optional    :: root
    integer(psb_mpk_) :: root_
    complex(psb_spk_) :: dat_
    integer(psb_mpk_) :: iam, np, info
    integer(psb_ipk_) :: iinfo


#if !defined(SERIAL_MPI)
    call psb_info(ictxt,iam,np)

    if (present(root)) then 
      root_ = root
    else
      root_ = -1
    endif
    if (root_ == -1) then 
      call mpi_allreduce(dat,dat_,1,psb_mpi_c_spk_,mpi_camx_op,ictxt,info)
      dat = dat_
    else
      call mpi_reduce(dat,dat_,1,psb_mpi_c_spk_,mpi_camx_op,root_,ictxt,info)
      if (iam == root_) dat = dat_
    endif
#endif    
  end subroutine psb_camxs

  subroutine psb_camxv(ictxt,dat,root)
    use psb_realloc_mod
#ifdef MPI_MOD
    use mpi
#endif
    implicit none 
#ifdef MPI_H
    include 'mpif.h'
#endif
    integer(psb_mpk_), intent(in)              :: ictxt
    complex(psb_spk_), intent(inout)  :: dat(:)
    integer(psb_mpk_), intent(in), optional    :: root
    integer(psb_mpk_) :: root_
    complex(psb_spk_), allocatable :: dat_(:)
    integer(psb_mpk_) :: iam, np,  info
    integer(psb_ipk_) :: iinfo


#if !defined(SERIAL_MPI)
    call psb_info(ictxt,iam,np)

    if (present(root)) then 
      root_ = root
    else
      root_ = -1
    endif
    if (root_ == -1) then 
      call psb_realloc(size(dat),dat_,iinfo)
      dat_ = dat
      if (iinfo == psb_success_) &
           & call mpi_allreduce(dat_,dat,size(dat),psb_mpi_c_spk_,mpi_camx_op,ictxt,info)
    else
      if (iam == root_) then 
        call psb_realloc(size(dat),dat_,iinfo)
        dat_ = dat
        call mpi_reduce(dat_,dat,size(dat),psb_mpi_c_spk_,mpi_camx_op,root_,ictxt,info)
      else
        call psb_realloc(1,dat_,iinfo)
        call mpi_reduce(dat,dat_,size(dat),psb_mpi_c_spk_,mpi_camx_op,root_,ictxt,info)
      end if
    endif
#endif    
  end subroutine psb_camxv

  subroutine psb_camxm(ictxt,dat,root)
    use psb_realloc_mod
#ifdef MPI_MOD
    use mpi
#endif
    implicit none 
#ifdef MPI_H
    include 'mpif.h'
#endif
    integer(psb_mpk_), intent(in)              :: ictxt
    complex(psb_spk_), intent(inout)  :: dat(:,:)
    integer(psb_mpk_), intent(in), optional    :: root
    integer(psb_mpk_) :: root_
    complex(psb_spk_), allocatable :: dat_(:,:)
    integer(psb_mpk_) :: iam, np,  info
    integer(psb_ipk_) :: iinfo

#if !defined(SERIAL_MPI)

    call psb_info(ictxt,iam,np)

    if (present(root)) then 
      root_ = root
    else
      root_ = -1
    endif
    if (root_ == -1) then 
      call psb_realloc(size(dat,1),size(dat,2),dat_,iinfo)
      dat_ = dat
      if (iinfo == psb_success_)&
           & call mpi_allreduce(dat_,dat,size(dat),psb_mpi_c_spk_,mpi_camx_op,ictxt,info)
    else
      if (iam == root_) then 
        call psb_realloc(size(dat,1),size(dat,2),dat_,iinfo)
        dat_ = dat
        call mpi_reduce(dat_,dat,size(dat),psb_mpi_c_spk_,mpi_camx_op,root_,ictxt,info)
      else
        call psb_realloc(1,1,dat_,iinfo)
        call mpi_reduce(dat,dat_,size(dat),psb_mpi_c_spk_,mpi_camx_op,root_,ictxt,info)
      end if
    endif
#endif    
  end subroutine psb_camxm


  subroutine psb_camxs_ec(ictxt,dat,root)
    implicit none 
    integer(psb_epk_), intent(in)              :: ictxt
    complex(psb_spk_), intent(inout)  :: dat
    integer(psb_epk_), intent(in), optional    :: root
    integer(psb_mpk_) :: ictxt_, root_

    ictxt_ = ictxt
    if (present(root)) then 
      root_ = root
      call psb_amx(ictxt_,dat,root_)
    else
      call psb_amx(ictxt_,dat)
    end if
  end subroutine psb_camxs_ec

  subroutine psb_camxv_ec(ictxt,dat,root)
    implicit none 
    integer(psb_epk_), intent(in)              :: ictxt
    complex(psb_spk_), intent(inout)  :: dat(:)
    integer(psb_epk_), intent(in), optional    :: root
    integer(psb_mpk_) :: ictxt_, root_

    ictxt_ = ictxt
    if (present(root)) then 
      root_ = root
      call psb_amx(ictxt_,dat,root_)
    else
      call psb_amx(ictxt_,dat)
    end if
  end subroutine psb_camxv_ec

  subroutine psb_camxm_ec(ictxt,dat,root)
    implicit none 
    integer(psb_epk_), intent(in)              :: ictxt
    complex(psb_spk_), intent(inout)  :: dat(:,:)
    integer(psb_epk_), intent(in), optional    :: root
    integer(psb_mpk_) :: ictxt_, root_

    ictxt_ = ictxt
    if (present(root)) then 
      root_ = root
      call psb_amx(ictxt_,dat,root_)
    else
      call psb_amx(ictxt_,dat)
    end if
  end subroutine psb_camxm_ec


  !
  ! AMN: Minimum Absolute Value
  !
  
  subroutine psb_camns(ictxt,dat,root)
#ifdef MPI_MOD
    use mpi
#endif
    implicit none 
#ifdef MPI_H
    include 'mpif.h'
#endif
    integer(psb_mpk_), intent(in)              :: ictxt
    complex(psb_spk_), intent(inout)  :: dat
    integer(psb_mpk_), intent(in), optional    :: root
    integer(psb_mpk_) :: root_
    complex(psb_spk_) :: dat_
    integer(psb_mpk_) :: iam, np, info
    integer(psb_ipk_) :: iinfo


#if !defined(SERIAL_MPI)
    call psb_info(ictxt,iam,np)

    if (present(root)) then 
      root_ = root
    else
      root_ = -1
    endif
    if (root_ == -1) then 
      call mpi_allreduce(dat,dat_,1,psb_mpi_c_spk_,mpi_camn_op,ictxt,info)
      dat = dat_
    else
      call mpi_reduce(dat,dat_,1,psb_mpi_c_spk_,mpi_camn_op,root_,ictxt,info)
      if (iam == root_) dat = dat_
    endif
#endif    
  end subroutine psb_camns

  subroutine psb_camnv(ictxt,dat,root)
    use psb_realloc_mod
#ifdef MPI_MOD
    use mpi
#endif
    implicit none 
#ifdef MPI_H
    include 'mpif.h'
#endif
    integer(psb_mpk_), intent(in)              :: ictxt
    complex(psb_spk_), intent(inout)  :: dat(:)
    integer(psb_mpk_), intent(in), optional    :: root
    integer(psb_mpk_) :: root_
    complex(psb_spk_), allocatable :: dat_(:)
    integer(psb_mpk_) :: iam, np,  info
    integer(psb_ipk_) :: iinfo


#if !defined(SERIAL_MPI)
    call psb_info(ictxt,iam,np)

    if (present(root)) then 
      root_ = root
    else
      root_ = -1
    endif
    if (root_ == -1) then 
      call psb_realloc(size(dat),dat_,iinfo)
      dat_ = dat
      if (iinfo == psb_success_) &
           & call mpi_allreduce(dat_,dat,size(dat),psb_mpi_c_spk_,mpi_camn_op,ictxt,info)
    else
      if (iam == root_) then 
        call psb_realloc(size(dat),dat_,iinfo)
        dat_ = dat
        call mpi_reduce(dat_,dat,size(dat),psb_mpi_c_spk_,mpi_camn_op,root_,ictxt,info)
      else
        call psb_realloc(1,dat_,iinfo)
        call mpi_reduce(dat,dat_,size(dat),psb_mpi_c_spk_,mpi_camn_op,root_,ictxt,info)
      end if
    endif
#endif    
  end subroutine psb_camnv

  subroutine psb_camnm(ictxt,dat,root)
    use psb_realloc_mod
#ifdef MPI_MOD
    use mpi
#endif
    implicit none 
#ifdef MPI_H
    include 'mpif.h'
#endif
    integer(psb_mpk_), intent(in)              :: ictxt
    complex(psb_spk_), intent(inout)  :: dat(:,:)
    integer(psb_mpk_), intent(in), optional    :: root
    integer(psb_mpk_) :: root_
    complex(psb_spk_), allocatable :: dat_(:,:)
    integer(psb_mpk_) :: iam, np,  info
    integer(psb_ipk_) :: iinfo

#if !defined(SERIAL_MPI)

    call psb_info(ictxt,iam,np)

    if (present(root)) then 
      root_ = root
    else
      root_ = -1
    endif
    if (root_ == -1) then 
      call psb_realloc(size(dat,1),size(dat,2),dat_,iinfo)
      dat_ = dat
      if (iinfo == psb_success_)&
           & call mpi_allreduce(dat_,dat,size(dat),psb_mpi_c_spk_,mpi_camn_op,ictxt,info)
    else
      if (iam == root_) then 
        call psb_realloc(size(dat,1),size(dat,2),dat_,iinfo)
        dat_ = dat
        call mpi_reduce(dat_,dat,size(dat),psb_mpi_c_spk_,mpi_camn_op,root_,ictxt,info)
      else
        call psb_realloc(1,1,dat_,iinfo)
        call mpi_reduce(dat,dat_,size(dat),psb_mpi_c_spk_,mpi_camn_op,root_,ictxt,info)
      end if
    endif
#endif    
  end subroutine psb_camnm


  subroutine psb_camns_ec(ictxt,dat,root)
    implicit none 
    integer(psb_epk_), intent(in)              :: ictxt
    complex(psb_spk_), intent(inout)  :: dat
    integer(psb_epk_), intent(in), optional    :: root
    integer(psb_mpk_) :: ictxt_, root_

    ictxt_ = ictxt
    if (present(root)) then 
      root_ = root
      call psb_amn(ictxt_,dat,root_)
    else
      call psb_amn(ictxt_,dat)
    end if
  end subroutine psb_camns_ec

  subroutine psb_camnv_ec(ictxt,dat,root)
    implicit none 
    integer(psb_epk_), intent(in)              :: ictxt
    complex(psb_spk_), intent(inout)  :: dat(:)
    integer(psb_epk_), intent(in), optional    :: root
    integer(psb_mpk_) :: ictxt_, root_

    ictxt_ = ictxt
    if (present(root)) then 
      root_ = root
      call psb_amn(ictxt_,dat,root_)
    else
      call psb_amn(ictxt_,dat)
    end if
  end subroutine psb_camnv_ec

  subroutine psb_camnm_ec(ictxt,dat,root)
    implicit none 
    integer(psb_epk_), intent(in)              :: ictxt
    complex(psb_spk_), intent(inout)  :: dat(:,:)
    integer(psb_epk_), intent(in), optional    :: root
    integer(psb_mpk_) :: ictxt_, root_

    ictxt_ = ictxt
    if (present(root)) then 
      root_ = root
      call psb_amn(ictxt_,dat,root_)
    else
      call psb_amn(ictxt_,dat)
    end if
  end subroutine psb_camnm_ec


  !
  ! BCAST Broadcast
  !
  
  subroutine psb_cbcasts(ictxt,dat,root)
#ifdef MPI_MOD
    use mpi
#endif
    implicit none 
#ifdef MPI_H
    include 'mpif.h'
#endif
    integer(psb_mpk_), intent(in)              :: ictxt
    complex(psb_spk_), intent(inout)  :: dat
    integer(psb_mpk_), intent(in), optional    :: root
    integer(psb_mpk_) :: root_

    integer(psb_mpk_) :: iam, np, info
    integer(psb_ipk_) :: iinfo


#if !defined(SERIAL_MPI)
    call psb_info(ictxt,iam,np)

    if (present(root)) then 
      root_ = root
    else
      root_ = psb_root_
    endif
    call mpi_bcast(dat,1,psb_mpi_c_spk_,root_,ictxt,info)

#endif    
  end subroutine psb_cbcasts

  subroutine psb_cbcastv(ictxt,dat,root)
    use psb_realloc_mod
#ifdef MPI_MOD
    use mpi
#endif
    implicit none 
#ifdef MPI_H
    include 'mpif.h'
#endif
    integer(psb_mpk_), intent(in)              :: ictxt
    complex(psb_spk_), intent(inout)  :: dat(:)
    integer(psb_mpk_), intent(in), optional    :: root
    integer(psb_mpk_) :: root_
    integer(psb_mpk_) :: iam, np,  info
    integer(psb_ipk_) :: iinfo


#if !defined(SERIAL_MPI)
    call psb_info(ictxt,iam,np)

    if (present(root)) then 
      root_ = root
    else
      root_ = psb_root_
    endif
    
    call mpi_bcast(dat,size(dat),psb_mpi_c_spk_,root_,ictxt,info)
#endif    
  end subroutine psb_cbcastv

  subroutine psb_cbcastm(ictxt,dat,root)
    use psb_realloc_mod
#ifdef MPI_MOD
    use mpi
#endif
    implicit none 
#ifdef MPI_H
    include 'mpif.h'
#endif
    integer(psb_mpk_), intent(in)              :: ictxt
    complex(psb_spk_), intent(inout)  :: dat(:,:)
    integer(psb_mpk_), intent(in), optional    :: root
    integer(psb_mpk_) :: root_

    integer(psb_mpk_) :: iam, np,  info
    integer(psb_ipk_) :: iinfo

#if !defined(SERIAL_MPI)

    call psb_info(ictxt,iam,np)

    if (present(root)) then 
      root_ = root
    else
      root_ = psb_root_
    endif

    call mpi_bcast(dat,size(dat),psb_mpi_c_spk_,root_,ictxt,info)
#endif    
  end subroutine psb_cbcastm


  subroutine psb_cbcasts_ec(ictxt,dat,root)
    implicit none 
    integer(psb_epk_), intent(in)              :: ictxt
    complex(psb_spk_), intent(inout)  :: dat
    integer(psb_epk_), intent(in), optional    :: root
    integer(psb_mpk_) :: ictxt_, root_

    ictxt_ = ictxt
    if (present(root)) then 
      root_ = root
      call psb_bcast(ictxt_,dat,root_)
    else
      call psb_bcast(ictxt_,dat)
    end if
  end subroutine psb_cbcasts_ec

  subroutine psb_cbcastv_ec(ictxt,dat,root)
    implicit none 
    integer(psb_epk_), intent(in)              :: ictxt
    complex(psb_spk_), intent(inout)  :: dat(:)
    integer(psb_epk_), intent(in), optional    :: root
    integer(psb_mpk_) :: ictxt_, root_

    ictxt_ = ictxt
    if (present(root)) then 
      root_ = root
      call psb_bcast(ictxt_,dat,root_)
    else
      call psb_bcast(ictxt_,dat)
    end if
  end subroutine psb_cbcastv_ec

  subroutine psb_cbcastm_ec(ictxt,dat,root)
    implicit none 
    integer(psb_epk_), intent(in)              :: ictxt
    complex(psb_spk_), intent(inout)  :: dat(:,:)
    integer(psb_epk_), intent(in), optional    :: root
    integer(psb_mpk_) :: ictxt_, root_

    ictxt_ = ictxt
    if (present(root)) then 
      root_ = root
      call psb_bcast(ictxt_,dat,root_)
    else
      call psb_bcast(ictxt_,dat)
    end if
  end subroutine psb_cbcastm_ec


  ! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
  !
  !  SCAN
  !
  ! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

  subroutine psb_cscan_sums(ictxt,dat)
#ifdef MPI_MOD
    use mpi
#endif
    implicit none 
#ifdef MPI_H
    include 'mpif.h'
#endif
    integer(psb_mpk_), intent(in)              :: ictxt
    complex(psb_spk_), intent(inout)  :: dat
    complex(psb_spk_) :: dat_
    integer(psb_mpk_) :: iam, np, info
    integer(psb_ipk_) :: iinfo


#if !defined(SERIAL_MPI)
    call psb_info(ictxt,iam,np)
    call mpi_scan(dat,dat_,1,psb_mpi_c_spk_,mpi_sum,ictxt,info)
    dat = dat_
#endif    
  end subroutine psb_cscan_sums


  subroutine psb_cexscan_sums(ictxt,dat)
#ifdef MPI_MOD
    use mpi
#endif
    implicit none 
#ifdef MPI_H
    include 'mpif.h'
#endif
    integer(psb_mpk_), intent(in)              :: ictxt
    complex(psb_spk_), intent(inout)  :: dat
    complex(psb_spk_) :: dat_
    integer(psb_mpk_) :: iam, np, info
    integer(psb_ipk_) :: iinfo


#if !defined(SERIAL_MPI)
    call psb_info(ictxt,iam,np)
    call mpi_exscan(dat,dat_,1,psb_mpi_c_spk_,mpi_sum,ictxt,info)
    dat = dat_
#else
    dat = czero
#endif    
  end subroutine psb_cexscan_sums

  subroutine psb_cscan_sumv(ictxt,dat,root)
    use psb_realloc_mod
#ifdef MPI_MOD
    use mpi
#endif
    implicit none 
#ifdef MPI_H
    include 'mpif.h'
#endif
    integer(psb_mpk_), intent(in)              :: ictxt
    complex(psb_spk_), intent(inout)  :: dat(:)
    integer(psb_mpk_), intent(in), optional    :: root
    integer(psb_mpk_) :: root_
    complex(psb_spk_), allocatable :: dat_(:)
    integer(psb_mpk_) :: iam, np,  info
    integer(psb_ipk_) :: iinfo

#if !defined(SERIAL_MPI)
    call psb_info(ictxt,iam,np)
    call psb_realloc(size(dat),dat_,iinfo)
    dat_ = dat
    if (iinfo == psb_success_) &
         & call mpi_scan(dat,dat_,size(dat),psb_mpi_c_spk_,mpi_sum,ictxt,info)
#endif
  end subroutine psb_cscan_sumv

  subroutine psb_cexscan_sumv(ictxt,dat,root)
    use psb_realloc_mod
#ifdef MPI_MOD
    use mpi
#endif
    implicit none 
#ifdef MPI_H
    include 'mpif.h'
#endif
    integer(psb_mpk_), intent(in)              :: ictxt
    complex(psb_spk_), intent(inout)  :: dat(:)
    integer(psb_mpk_), intent(in), optional    :: root
    integer(psb_mpk_) :: root_
    complex(psb_spk_), allocatable :: dat_(:)
    integer(psb_mpk_) :: iam, np,  info
    integer(psb_ipk_) :: iinfo

#if !defined(SERIAL_MPI)
    call psb_info(ictxt,iam,np)
    call psb_realloc(size(dat),dat_,iinfo)
    dat_ = dat
    if (iinfo == psb_success_) &
         & call mpi_exscan(dat,dat_,size(dat),psb_mpi_c_spk_,mpi_sum,ictxt,info)
#else
    dat = czero
#endif
  end subroutine psb_cexscan_sumv
  
end module psi_c_collective_mod