fh->seek(*(fh->shared_file_pointer_),MPI_SEEK_SET);
write(fh, const_cast<void*>(buf), count, datatype, status);
*(fh->shared_file_pointer_)=fh->file_->tell();
fh->seek(*(fh->shared_file_pointer_),MPI_SEEK_SET);
write(fh, const_cast<void*>(buf), count, datatype, status);
*(fh->shared_file_pointer_)=fh->file_->tell();