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

       USE MPI
       ! or the older form: INCLUDE 'mpif.h'
       MPI_FILE_READ_ORDERED_END(FH, BUF, STATUS, IERROR)
            <type>    BUF(*)
            INTEGER   FH, STATUS(MPI_STATUS_SIZE), IERROR

Fortran 2008 Syntax

       USE mpi_f08
       MPI_File_read_ordered_end(fh, buf, status, ierror)
            TYPE(MPI_File), INTENT(IN) :: fh
            TYPE(*), DIMENSION(..), ASYNCHRONOUS :: buf
            TYPE(MPI_Status) :: status
            INTEGER, OPTIONAL, INTENT(OUT) :: 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.

4.1.2                                             Nov 24, 2021                      MPI_File_read_ordered_end(3)