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MPI_File_write_at_all_begin - Writes a file at explicitly specified
offsets; beginning part of a split collective routine (nonblocking).
C Syntax
#include <mpi.h>
int MPI_File_write_at_all_begin(MPI_File fh, MPI_Offset offset,
const void *buf, int count, MPI_Datatype datatype)
USE MPI
! or the older form: 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
USE mpi_f08
MPI_File_write_at_all_begin(fh, offset, buf, count, datatype, ierror)
TYPE(MPI_File), INTENT(IN) :: fh
INTEGER(KIND=MPI_OFFSET_KIND), INTENT(IN) :: offset
TYPE(*), DIMENSION(..), INTENT(IN), ASYNCHRONOUS :: buf
INTEGER, INTENT(IN) :: count
TYPE(MPI_Datatype), INTENT(IN) :: datatype
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
- fh
- File handle (handle).
- 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).
- IERROR
- Fortran only: Error status (integer).
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.
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.
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.
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.
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