MPI_Win_get_attr(3) 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)

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

C++ Syntax

#include <mpi.h>
bool MPI::Win::Get_attr(int win_keyval, void* attribute_val) const

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.

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