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MPI_Win_shared_query - Query a shared memory window
#include <mpi.h>
int MPI_Win_shared_query (MPI_Win win, int rank, MPI_Aint *size,
int *disp_unit, void *baseptr)
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
- win
- Shared memory window object (handle).
- rank
- Rank in the
group of window win (non-negative integer) or MPI_PROC_NULL.
- 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 [char167] 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 rank is 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.
Almost all
MPI routines return an error value; C routines as the value of the function
and Fortran routines in the last argument.
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.
MPI_Alloc_mem
MPI_Win_allocate_shared
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