MPI_Win_shared_query - Query a shared memory window
19.2.459.1.1. C Syntax
#include <mpi.h> int MPI_Win_shared_query (MPI_Win win, int rank, MPI_Aint *size, int *disp_unit, void *baseptr)
19.2.459.1.2. Fortran Syntax
USE MPI ! or the older form: INCLUDE 'mpif.h' MPI_WIN_SHARED_QUERY(WIN, RANK, SIZE, DISP_UNIT, BASEPTR, IERROR) INTEGER WIN, RANK, DISP_UNIT, IERROR INTEGER(KIND=MPI_ADDRESS_KIND) SIZE, BASEPTR
19.2.459.1.3. Fortran 2008 Syntax
USE mpi_f08 MPI_Win_shared_query(win, rank, size, disp_unit, baseptr, ierror) USE, INTRINSIC :: ISO_C_BINDING, ONLY : C_PTR TYPE(MPI_Win), INTENT(IN) :: win INTEGER, INTENT(IN) :: rank INTEGER(KIND=MPI_ADDRESS_KIND), INTENT(OUT) :: size INTEGER, INTENT(OUT) :: disp_unit TYPE(C_PTR), INTENT(OUT) :: baseptr INTEGER, OPTIONAL, INTENT(OUT) :: ierror
19.2.459.2. INPUT PARAMETERS
win: Shared memory window object (handle).
rank: Rank in the group of window win (non-negative integer) or
19.2.459.3. OUTPUT PARAMETERS
size: Size of the window segment (non-negative integer).
disp_unit: Local unit size for displacements, in bytes (positive integer).
baseptr: Address for load/store access to window segment (choice).
ierror: Fortran only: Error status (integer).
MPI_Win_shared_query queries the process-local address for
remote memory segments created with
MPI_Win_allocate_shared. This function can return different
process-local addresses for the same physical memory on different
processes. The returned memory can be used for load/store accesses
subject to the constraints defined in MPI-3.1 section 11.7. This
function can only be called with windows of flavor
MPI_WIN_FLAVOR_SHARED. If the passed window is not of flavor
MPI_WIN_FLAVOR_SHARED, the error MPI_ERR_RMA_FLAVOR is raised. When
MPI_PROC_NULL, the pointer, disp_unit, and size returned
are the pointer, disp_unit, and size of the memory segment belonging
the lowest rank that specified size > 0. If all processes in the
group attached to the window specified size = 0, then the call
returns size = 0 and a baseptr as if MPI_Alloc_mem was
called with size = 0.
19.2.459.5. C NOTES
The parameter baseptr is of type
void * to allow passing any
pointer object for this parameter. The provided argument should be a
pointer to a pointer of arbitrary type (e.g.
Almost all MPI routines return an error value; C routines as the return result of the function and Fortran routines in the last argument.
Before the error value is returned, the current MPI error handler associated with the communication object (e.g., communicator, window, file) is called. If no communication object is associated with the MPI call, then the call is considered attached to MPI_COMM_SELF and will call the associated MPI error handler. When MPI_COMM_SELF is not initialized (i.e., before MPI_Init/MPI_Init_thread, after MPI_Finalize, or when using the Sessions Model exclusively) the error raises the initial error handler. The initial error handler can be changed by calling MPI_Comm_set_errhandler on MPI_COMM_SELF when using the World model, or the mpi_initial_errhandler CLI argument to mpiexec or info key to MPI_Comm_spawn/MPI_Comm_spawn_multiple. If no other appropriate error handler has been set, then the MPI_ERRORS_RETURN error handler is called for MPI I/O functions and the MPI_ERRORS_ABORT error handler is called for all other MPI functions.
Open MPI includes three predefined error handlers that can be used:
MPI_ERRORS_ARE_FATALCauses the program to abort all connected MPI processes.
MPI_ERRORS_ABORTAn error handler that can be invoked on a communicator, window, file, or session. When called on a communicator, it acts as if MPI_Abort was called on that communicator. If called on a window or file, acts as if MPI_Abort was called on a communicator containing the group of processes in the corresponding window or file. If called on a session, aborts only the local process.
MPI_ERRORS_RETURNReturns an error code to the application.
MPI applications can also implement their own error handlers by calling:
MPI_Session_create_errhandler then MPI_Session_set_errhandler or at MPI_Session_init
Note that MPI does not guarantee that an MPI program can continue past an error.
See the MPI man page for a full list of MPI error codes.
See the Error Handling section of the MPI-3 standard for more information.