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Man Pages


Manual Reference Pages  -  MPI_FILE_IWRITE (3)

NAME

MPI_File_iwrite - Writes a file starting at the location specified by the individual file pointer (nonblocking, noncollective).

CONTENTS

Syntax
Fortran Syntax
C++ Syntax
Input/output Parameter
Input Parameters
Output Parameter
Description
Errors

SYNTAX

C Syntax
    #include <mpi.h>
    int MPI_File_iwrite(MPI_File fh, const 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)

INPUT/OUTPUT PARAMETER

fh File handle (handle).

INPUT PARAMETERS

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.

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1.10.2 MPI_FILE_IWRITE (3) Jan 21, 2016

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