MPI_Win_get_attr(3)

NAME
MPI_Win_get_attr - Obtains the value of a window attribute.

SYNTAX

C Syntax
#include <mpi.h>
int MPI_Win_get_attr(MPI_Win win, int win_keyval,
	void *attribute_val, int *flag)

Fortran Syntax (see FORTRAN 77 NOTES)
USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_WIN_GET_ATTR(WIN, WIN_KEYVAL, ATTRIBUTE_VAL, FLAG, IERROR)
	INTEGER WIN, WIN_KEYVAL, IERROR
	INTEGER(KIND=MPI_ADDRESS_KIND) ATTRIBUTE_VAL
	LOGICAL FLAG

Fortran 2008 Syntax
USE mpi_f08
MPI_Win_get_attr(win, win_keyval, attribute_val, flag, ierror)
	TYPE(MPI_Win), INTENT(IN) :: win
	INTEGER, INTENT(IN) :: win_keyval
	INTEGER(KIND=MPI_ADDRESS_KIND), INTENT(OUT) :: attribute_val
	LOGICAL, INTENT(OUT) :: flag
	INTEGER, OPTIONAL, INTENT(OUT) :: ierror

INPUT PARAMETERS

win Window to which the attribute is attached (handle).

win_keyval
    Key value (integer).

OUTPUT PARAMETERS

attribute_val
    Attribute value, unless ag = false

flag
    False if no attribute is associated with the key (logical).

IERROR
    Fortran only: Error status (integer).

DESCRIPTION
Obtains the value of a window attribute.

FORTRAN 77 NOTES
The MPI standard prescribes portable Fortran syntax for the ATTRIBUTE_VAL argument only for Fortran 90. FORTRAN 77 users may use the non-portable syntax

     INTEGER*MPI_ADDRESS_KIND ATTRIBUTE_VAL

where MPI_ADDRESS_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++ 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. By default, this error handler aborts the MPI job, except for I/O function errors. The error handler may be changed with MPI_Comm_set_errhandler; the predefined error handler MPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not guarantee that an MPI program can continue past an error.