osx man page for mpi_file_write_at_all_begin

MPI_File_write_at_all_begin(3OpenMPI)									     MPI_File_write_at_all_begin(3OpenMPI)

NAME
       MPI_File_write_at_all_begin - Writes a file at explicitly specified offsets; beginning part of a split collective routine (nonblocking).

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

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

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

INPUT
/OUTPUT PARAMETER
       fh	 File handle (handle).

INPUT PARAMETERS
       offset	 File offset (handle).

       buf	 Initial address of buffer (choice).

       count	 Number of elements in buffer (integer).

       datatype  Data type of each buffer element (handle).

OUTPUT PARAMETER
       IERROR	 Fortran only: Error status (integer).

DESCRIPTION
       MPI_File_write_at_all_begin  is	the  beginning	part of a split collective, that is, a nonblocking routine that attempts to write into the
       file associated with fh (at the offset position) a total number of count data items having datatype type from 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 written into
       those parts of the file specified by the current view.

FORTRAN 77 NOTES
       The MPI standard prescribes portable Fortran syntax for the OFFSET argument only for Fortran 90.  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.

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++ 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_write_at_all_begin(3OpenMPI)