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NAME

       MPI_Alloc_mem  - Allocates a specified memory segment.

SYNTAX


C Syntax

       #include <mpi.h>
       int MPI_Alloc_mem(MPI_Aint size, MPI_Info info, void *baseptr)

Fortran Syntax (see FORTRAN NOTES)

       INCLUDE 'mpif.h'
       MPI_ALLOC_MEM(SIZE, INFO, BASEPTR, IERROR)
            INTEGER INFO, IERROR
            INTEGER(KIND=MPI_ADDRESS_KIND) SIZE, BASEPTR

C++ Syntax

       #include <mpi.h>
       void* MPI::Alloc_mem(MPI::Aint size, const MPI::Info& info)

INPUT PARAMETERS

       size      Size of memory segment in bytes (nonnegative integer).

       info      Info argument (handle).

OUTPUT PARAMETERS

       baseptr   Pointer to beginning of memory segment allocated.

       IERROR    Fortran only: Error status (integer).

DESCRIPTION

       MPI_Alloc_mem  allocates  size bytes of memory. The starting address of
       this memory is returned in the variable base.

FORTRAN NOTES

       There is no portable FORTRAN 77 syntax for using MPI_Alloc_mem.   There
       is  no  portable  Fortran  syntax  for  using  pointers  returned  from
       MPI_Alloc_mem. However, MPI_Alloc_mem can  be  used  with  Sun  Fortran
       compilers.

       From  FORTRAN  77,  you can use the following non-standard declarations
       for the SIZE and BASEPTR arguments:
                  INCLUDE "mpif.h"
                  INTEGER*MPI_ADDRESS_KIND SIZE, BASEPTR

       From either FORTRAN 77 or Fortran 90, you can use "Cray  pointers"  for
       the  BASEPTR  argument.  Cray  pointers  are  described  further in the
       Fortran User's Guide and are supported by many Fortran compilers.   For
       example,

                  INCLUDE "mpif.h"
                  REAL*4 A(100,100)
                  POINTER (BASEPTR, A)
                  INTEGER*MPI_ADDRESS_KIND SIZE

                  SIZE = 4 * 100 * 100
                  CALL MPI_ALLOC_MEM(SIZE,MPI_INFO_NULL,BASEPTR,IERR)

                  ! use A

                  CALL MPI_FREE_MEM(A, IERR)

ERRORS

       Almost  all MPI routines return an error value; C routines as the value
       of the  function  and  Fortran  routines  in  the  last  argument.  C++
       functions  do not return errors. If the default error handler is set to
       MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism
       will be used to throw an MPI:Exception object.

       Before  the  error  value is returned, the current MPI error handler is
       called. By default, this error handler aborts the MPI job,  except  for
       I/O   function   errors.   The   error  handler  may  be  changed  with
       MPI_Comm_set_errhandler; the predefined error handler MPI_ERRORS_RETURN
       may  be  used  to cause error values to be returned. Note that MPI does
       not guarantee that an MPI program can continue past an error.

SEE ALSO

       MPI_Free_mem



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