mpi_file_get_view(3openmpi) [osx man page]

MPI_File_get_view(3OpenMPI)											       MPI_File_get_view(3OpenMPI)

NAME

       MPI_File_get_view - Returns the process's view of data in the file.

SYNTAX

       C Syntax
	   #include <mpi.h>
	   int MPI_File_get_view(MPI_File fh, MPI_Offset *disp,
		  MPI_Datatype *etype, MPI_Datatype *filetype,
		     char *datarep)

       Fortran Syntax (see FORTRAN 77 NOTES)
	   INCLUDE 'mpif.h'
	   MPI_FILE_GET_VIEW(FH, DISP, ETYPE,
		   FILETYPE, DATAREP,  IERROR)
	     INTEGER FH, ETYPE, FILETYPE, IERROR
	     CHARACTER*(*) DATAREP
	     INTEGER(KIND=MPI_OFFSET_KIND) DISP

C++ Syntax
       #include <mpi.h>
       void MPI::File::Get_view(MPI::Offset& disp,
	    MPI::Datatype& etype,
	    MPI::Datatype& filetype, char* datarep) const

INPUT PARAMETER

       fh	 File handle (handle).

OUTPUT PARAMETERS

       disp	 Displacement (integer).

       etype	 Elementary data type (handle).

       filetype  File type (handle). See Restrictions, below.

       datarep	 Data representation (string).

       IERROR	 Fortran only: Error status (integer).

DESCRIPTION

       The  MPI_File_get_view routine returns the process's view of the data in the file. The current values of the displacement, etype, and file-
       type are returned in disp, etype, and filetype, respectively.

       The MPI_File_get_view interface allows the user to pass a data-representation string via the datarep argument.

FORTRAN 77 NOTES
       The MPI standard prescribes portable Fortran syntax for the DISP argument only for Fortran 90.  FORTRAN 77 users may use  the  non-portable
       syntax.

	    INTEGER*MPI_OFFSET_KIND DISP

       where MPI_OFFSET_KIND is a constant defined in mpif.h and gives the length of the declared integer in bytes.

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. For MPI I/O function errors, the default error handler is set
       to MPI_ERRORS_RETURN. The error handler may be changed with MPI_File_set_errhandler; the predefined error handler MPI_ERRORS_ARE_FATAL  may
       be used to make I/O errors fatal. Note that MPI does not guarantee that an MPI program can continue past an error.

Open MPI 1.2							  September 2006				       MPI_File_get_view(3OpenMPI)

MPI_File_iread_at(3OpenMPI)											       MPI_File_iread_at(3OpenMPI)

NAME

       MPI_File_iread_at - Reads a file at an explicitly specified offset (nonblocking, noncollective).

SYNTAX

       C Syntax
	   #include <mpi.h>
	   int MPI_File_iread_at(MPI_File fh, MPI_Offset offset,
		  void *buf, int count, MPI_Datatype datatype,
		  MPI_Request *request)

       Fortran Syntax (see FORTRAN 77 NOTES)
	   INCLUDE 'mpif.h'
	   MPI_FILE_IREAD_AT(FH, OFFSET, BUF, COUNT, DATATYPE, REQUEST, IERROR)
		 <type> BUF(*)
		 INTEGER   FH, COUNT, DATATYPE, REQUEST, IERROR
		 INTEGER(KIND=MPI_OFFSET_KIND) OFFSET

C++ Syntax
       #include <mpi.h>
       MPI::Request MPI::File::Iread_at(MPI::Offset offset, void* buf,
	    int count, const MPI::Datatype& datatype)

INPUT PARAMETERS

       fh	 File handle (handle).

       offset	 File offset (integer).

       count	 Number of elements in the buffer (integer).

       datatype  Data type of each buffer element (handle).

OUTPUT PARAMETERS

       buf	 Initial address of the buffer (choice).

       request	 Request object (handle).

       IERROR	 Fortran only: Error status (integer).

DESCRIPTION

       MPI_File_iread_at is the nonblocking version of MPI_File_read_at.

       MPI_File_iread_at  is a nonblocking routine that attempts to read from the file associated with fh at the offset position a total number of
       count data items having datatype type into the user's buffer buf.  The offset is in etype units relative to  the  current  view.  That  is,
       holes  are  not	counted  when  locating  an  offset.  The  data  is  taken  out  of those parts of the file specified by the current view.
       MPI_File_iread_at stores the number of datatype elements actually read in status.  All other fields of status are undefined.

FORTRAN 77 NOTES
       The MPI standard prescribes portable Fortran syntax for the OFFSET argument only for Fortran 90.  Sun FORTRAN 77 users may use the non-por-
       table syntax

	    INTEGER*MPI_OFFSET_KIND OFFSET

       where MPI_OFFSET_KIND is a constant defined in mpif.h and gives the length of the declared integer in bytes.

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. For MPI I/O function errors, the default error handler is set
       to MPI_ERRORS_RETURN. The error handler may be changed with MPI_File_set_errhandler; the predefined error handler MPI_ERRORS_ARE_FATAL  may
       be used to make I/O errors fatal. Note that MPI does not guarantee that an MPI program can continue past an error.

Open MPI 1.2							  September 2006				       MPI_File_iread_at(3OpenMPI)