NAME¶
MPI_File_iwrite - Writes a file starting at the location specified by the
individual file pointer (nonblocking, noncollective).
SYNTAX¶
C Syntax
#include <mpi.h>
int MPI_File_iwrite(MPI_File fh, void *buf, int count,
MPI_Datatype datatype, MPI_Request *request)
Fortran Syntax¶
INCLUDE 'mpif.h'
MPI_FILE_IWRITE( FH, BUF, COUNT, DATATYPE, REQUEST, IERROR)
<TYPE> BUF(*)
INTEGER FH, COUNT, DATATYPE, REQUEST, IERROR
C++ Syntax¶
#include <mpi.h>
MPI::Request MPI::File::Iwrite(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¶
- request
- Request object (handle).
- IERROR
- Fortran only: Error status (integer).
DESCRIPTION¶
MPI_File_iwrite is a nonblocking version of the MPI_File_write interface. It
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_iwrite 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 open.
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.