MPI_Alloc_mem(3OpenMPI) 												   MPI_Alloc_mem(3OpenMPI)

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 For-
       tran 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++ func-
       tions 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

Open MPI 1.2							  September 2006					   MPI_Alloc_mem(3OpenMPI)