MPI_File_iwrite_at_all(3) Open MPI MPI_File_iwrite_at_all(3)
NAME
MPI_File_iwrite_at_all - Writes a file at an explicitly specified off-
set (nonblocking, collective).
SYNTAX
C Syntax
#include <mpi.h>
int MPI_File_iwrite_at_all(MPI_File fh, MPI_Offset offset,
const void *buf, int count, MPI_Datatype datatype, MPI_Request *request)
Fortran Syntax (see FORTRAN 77 NOTES)
USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_FILE_IWRITE_AT_ALL(FH, OFFSET, BUF, COUNT, DATATYPE, REQUEST, IERROR)
<type> BUF(*)
INTEGER FH, COUNT, DATATYPE, REQUEST, IERROR
INTEGER(KIND=MPI_OFFSET_KIND) OFFSET
Fortran 2008 Syntax
USE mpi_f08
MPI_File_iwrite_at_all(fh, offset, buf, count, datatype, request, ierror)
TYPE(MPI_File), INTENT(IN) :: fh
INTEGER(KIND=MPI_OFFSET_KIND), INTENT(IN) :: offset
TYPE(*), DIMENSION(..) :: buf
INTEGER, INTENT(IN) :: count
TYPE(MPI_Datatype), INTENT(IN) :: datatype
TYPE(MPI_Request), INTENT(OUT) :: request
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
INPUT/OUTPUT PARAMETER
fh File handle (handle).
INPUT PARAMETERS
offset File offset (integer).
buf Initial address of buffer (choice).
count Number of elements in buffer (integer).
datatype Data type of each buffer element (handle).
OUTPUT PARAMETERS
request Request object (handle).
IERROR Fortran only: Error status (integer).
DESCRIPTION
MPI_File_iwrite_at_all is a nonblocking version of
MPI_File_write_at_all. It attempts to write into the file associated
with fh (at the offset position) a total number of count data items
having datatype type from the user's buffer buf. The offset is in
etype units relative to the current view. That is, holes are not
counted when locating an offset. The data is written into those parts
of the file specified by the current view. MPI_File_iwrite_at_all
stores the number of datatype elements actually written in status. All
other fields of status are undefined. The request structure can be
passed to MPI_Wait or MPI_Test, which will return a status with the
number of bytes actually accessed.
It is erroneous to call this function if MPI_MODE_SEQUENTIAL mode was
specified when the file was open.
FORTRAN 77 NOTES
The MPI standard prescribes portable Fortran syntax for the OFFSET ar-
gument only for Fortran 90. FORTRAN 77 users may use the non-portable
syntax
INTEGER*MPI_OFFSET_KIND OFFSET
where MPI_OFFSET_KIND is a constant defined in mpif.h and gives the
length of the declared integer in bytes.
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++ func-
tions 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_ER-
RORS_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.
4.1.2 Nov 24, 2021 MPI_File_iwrite_at_all(3)
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