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)¶

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.