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MPI_File_iwrite - Writes a file starting at the location specified
by the individual file pointer (nonblocking, noncollective).
C Syntax
#include <mpi.h>
int MPI_File_iwrite(MPI_File fh, const void *buf, int count,
MPI_Datatype datatype, MPI_Request *request)
INCLUDE ’mpif.h’
MPI_FILE_IWRITE(FH, BUF, COUNT, DATATYPE, REQUEST, IERROR)
<TYPE> BUF(*)
INTEGER FH, COUNT, DATATYPE, REQUEST, IERROR
#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).
- request
- Request object (handle).
- IERROR
- Fortran only: Error status (integer).
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.
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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