NAME

       MPI_Dist_graph_neighbors  -   Provides  adjacency  information  for  a  distributed  graph
       topology.

SYNOPSIS

       int MPI_Dist_graph_neighbors(MPI_Comm comm,
                                    int maxindegree, int sources[], int sourceweights[],
                                    int maxoutdegree, int destinations[], int destweights[])

INPUT PARAMETERS

       comm   - communicator with distributed graph topology (handle)
       maxindegree
              - size of sources and sourceweights arrays (non-negative integer)
       maxoutdegree
              - size of destinations and destweights arrays (non-negative integer)

OUTPUT PARAMETERS

       sources
              - processes for which the calling process is a destination (array  of  non-negative
              integers)
       sourceweights
              - weights of the edges into the calling process (array of non-negative integers)
       destinations
              -  processes  for  which  the  calling  process  is a source (array of non-negative
              integers)
       destweights
              - weights of the edges out of the calling process (array of non-negative integers)

THREAD AND INTERRUPT SAFETY

       This routine is thread-safe.  This means that this routine may be safely used by  multiple
       threads  without the need for any user-provided thread locks.  However, the routine is not
       interrupt safe.  Typically, this is due to the use of memory allocation routines  such  as
       malloc or other non-MPICH runtime routines that are themselves not interrupt-safe.

NOTES FOR FORTRAN

       All  MPI  routines  in  Fortran  (except  for MPI_WTIME and MPI_WTICK ) have an additional
       argument ierr at the end of the argument list.  ierr  is  an  integer  and  has  the  same
       meaning  as  the  return  value  of  the  routine  in  C.   In  Fortran,  MPI routines are
       subroutines, and are invoked with the call statement.

       All MPI objects (e.g., MPI_Datatype , MPI_Comm ) are of type INTEGER in Fortran.

ERRORS

       All MPI routines (except MPI_Wtime and MPI_Wtick ) return an error value;  C  routines  as
       the  value of the function and Fortran routines in the last argument.  Before the value is
       returned, the current MPI error handler is called.  By default, this error handler  aborts
       the  MPI  job.   The  error  handler  may  be  changed  with  MPI_Comm_set_errhandler (for
       communicators), MPI_File_set_errhandler (for files), and MPI_Win_set_errhandler  (for  RMA
       windows).   The  MPI-1  routine  MPI_Errhandler_set may be used but its use is deprecated.
       The predefined error handler MPI_ERRORS_RETURN may be used to cause  error  values  to  be
       returned.   Note  that  MPI  does  not  guarentee that an MPI program can continue past an
       error; however, MPI implementations will attempt to continue whenever possible.

       MPI_SUCCESS
              - No error; MPI routine completed successfully.

LOCATION

       src/mpi/topo/dist_gr_neighb.c

                                            4/24/2013                 MPI_Dist_graph_neighbors(3)