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MPI_File_write - Writes a file starting at the location specified
by the individual file pointer (blocking, noncollective).
C Syntax
#include <mpi.h>
int MPI_File_write(MPI_File fh, const void *buf,
int count, MPI_Datatype datatype,
MPI_Status *status)
INCLUDE ’mpif.h’
MPI_FILE_WRITE(FH, BUF, COUNT,
DATATYPE, STATUS, IERROR)
<type> BUF(*)
INTEGER FH, COUNT, DATATYPE, STATUS(MPI_STATUS_SIZE),
IERROR
#include <mpi.h>
void MPI::File::Write(const void* buf, int count,
const MPI::Datatype& datatype, MPI::Status& status)
void MPI::File::Write(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).
- status
- Status object (status).
- IERROR
- Fortran only: Error status (integer).
MPI_File_write
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. MPI_File_write
stores the number of datatype elements actually written in status. All
other fields of status are undefined.
It is erroneous to call this function
if MPI_MODE_SEQUENTIAL mode was specified when the file was opened.
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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