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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)
USE MPI
! or the older form: 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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