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, 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)
File handle (handle).
Initial address of buffer (choice).
Number of elements in buffer (integer).
Data type of each buffer element (handle).
Request object (handle).
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.