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)

       USE MPI
       ! or the older form: 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-portable 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++ 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.