MPI_File_read_ordered_end(3)       Open MPI       MPI_File_read_ordered_end(3)



NAME
       MPI_File_read_ordered_end - Reads a file at a location specified by a
       shared file pointer; ending part of a split collective routine
       (blocking).


SYNTAX
       C Syntax
           #include <mpi.h>
           int MPI_File_read_ordered_end(MPI_File fh, void *buf,
                  MPI_Status *status)

       Fortran Syntax
           INCLUDE 'mpif.h'
           MPI_FILE_READ_ORDERED_END(FH, BUF, STATUS, IERROR)
                 <type>         BUF(*)
                 INTEGER        FH, STATUS(MPI_STATUS_SIZE), IERROR


C++ Syntax
       #include <mpi.h>
       void MPI::File::Read_ordered_end(void* buf, MPI::Status& status)

       void MPI::File::Read_ordered_end(void* buf)


INPUT/OUTPUT PARAMETER
       fh        File handle (handle).


OUTPUT PARAMETERS
       buf       Initial address of buffer (choice).

       status    Status object (status).

       IERROR    Fortran only: Error status (integer).


DESCRIPTION
       MPI_File_read_ordered_end is the ending part of a split collective
       routine that must be called by all processes in the communicator group
       associated with the file handle fh.  MPI_File_rad_ordered_end blocks
       until the operation initiated by MPI_File_read_ordered_begin completes.
       It attempts to read the file associated with fh into the user's buffer
       buf.  The shared file pointer is updated by the amounts of data
       requested by all processes of the group. For each process, the location
       in the file at which data is read is the position at which the shared
       file pointer would be after all processes whose ranks within the group
       are less than that of this process had read their data.


NOTES
       All the nonblocking collective routines for data access are "split"
       into two routines, each with _begin or _end as a suffix. These split
       collective routines are subject to the semantic rules described in
       Section 9.4.5 of the MPI-2 standard.


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. 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.




1.4.1                            Jan 14, 2010     MPI_File_read_ordered_end(3)
