NAME¶
MPI_File_write_all_begin - Writes a file starting at the locations
specified by individual file pointers; beginning part of a split collective
routine (nonblocking).
SYNTAX¶
C Syntax
#include <mpi.h>
int MPI_File_write_all_begin(MPI_File fh, void *buf,
int count, MPI_Datatype datatype)
Fortran Syntax¶
INCLUDE 'mpif.h'
MPI_FILE_WRITE_ALL_BEGIN( FH, BUF, COUNT, DATATYPE, IERROR)
<type> BUF(*)
INTEGER FH, COUNT, DATATYPE, IERROR
C++ Syntax¶
#include <mpi.h>
void MPI::File::Write_all_begin(const void* buf, int count,
const MPI::Datatype& datatype)
- fh
- File handle (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_all_begin is the beginning part of a split collective,
nonblocking routine that attempts to write into the file associated with
fh (at the current individual file pointer position maintained by the
system) a total number of
count data items having
datatype type
from the user's buffer
buf. The data is written into those parts of the
file specified by the current view.
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.