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.TH MPI_Win_shared_query 3 "11/12/2019" " " "MPI"
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.SH NAME
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MPI_Win_shared_query \- Query the size and base pointer for a patch of a shared memory window.
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.SH SYNOPSIS
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.nf
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int MPI_Win_shared_query(MPI_Win win, int rank, MPI_Aint * size, int *disp_unit, void *baseptr)
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.fi
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This function queries the process-local address for remote memory segments
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created with
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.I MPI_Win_allocate_shared
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\&.
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This function can return different
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process-local addresses for the same physical memory on different processes.
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The returned memory can be used for load/store accesses subject to the
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constraints defined in MPI 3.0, Section 11.7. This function can only be called
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with windows of type
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.I MPI_Win_flavor_shared
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\&.
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If the passed window is not of
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flavor
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.I MPI_Win_flavor_shared
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, the error
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.I MPI_ERR_RMA_FLAVOR
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is raised. When rank
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is
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.I MPI_PROC_NULL
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, the pointer, disp_unit, and size returned are the pointer,
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disp_unit, and size of the memory segment belonging the lowest rank that
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specified size > 0. If all processes in the group attached to the window
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specified size = 0, then the call returns size = 0 and a baseptr as if
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.I MPI_Alloc_mem
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was called with size = 0.
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.SH INPUT PARAMETERS
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.PD 0
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.TP
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.B win
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- window object used for communication (handle)
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.PD 1
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.PD 0
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.TP
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.B rank
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- target rank
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.PD 1
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.SH OUTPUT PARAMETERS
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.PD 0
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.TP
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.B size
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- size of the segment at the given rank
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.PD 1
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.PD 0
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.TP
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.B disp_unit
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- local unit size for displacements, in bytes (positive integer)
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.PD 1
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.PD 0
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.TP
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.B baseptr
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- base pointer in the calling process' address space of the shared
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segment belonging to the target rank.
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.PD 1
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.SH THREAD AND INTERRUPT SAFETY
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This routine is thread-safe. This means that this routine may be
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safely used by multiple threads without the need for any user-provided
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thread locks. However, the routine is not interrupt safe. Typically,
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this is due to the use of memory allocation routines such as
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.I malloc
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or other non-MPICH runtime routines that are themselves not interrupt-safe.
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.SH NOTES FOR FORTRAN
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All MPI routines in Fortran (except for
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.I MPI_WTIME
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and
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.I MPI_WTICK
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) have
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an additional argument
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.I ierr
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at the end of the argument list.
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.I ierr
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is an integer and has the same meaning as the return value of the routine
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in C. In Fortran, MPI routines are subroutines, and are invoked with the
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.I call
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statement.
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All MPI objects (e.g.,
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.I MPI_Datatype
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,
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.I MPI_Comm
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) are of type
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.I INTEGER
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in Fortran.
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.SH ERRORS
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All MPI routines (except
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.I MPI_Wtime
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and
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.I MPI_Wtick
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) return an error value;
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C routines as the value of the function and Fortran routines in the last
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argument. Before the value is returned, the current MPI error handler is
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called. By default, this error handler aborts the MPI job. The error handler
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may be changed with
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.I MPI_Comm_set_errhandler
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(for communicators),
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.I MPI_File_set_errhandler
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(for files), and
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.I MPI_Win_set_errhandler
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(for
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RMA windows). The MPI-1 routine
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.I MPI_Errhandler_set
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may be used but
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its use is deprecated. The predefined error handler
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.I MPI_ERRORS_RETURN
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may be used to cause error values to be returned.
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Note that MPI does
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.B not
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guarentee that an MPI program can continue past
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an error; however, MPI implementations will attempt to continue whenever
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possible.
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.PD 0
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.TP
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.B MPI_SUCCESS
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- No error; MPI routine completed successfully.
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.PD 1
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.PD 0
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.TP
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.B MPI_ERR_ARG
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- Invalid argument. Some argument is invalid and is not
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identified by a specific error class (e.g.,
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.I MPI_ERR_RANK
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).
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.PD 1
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.PD 0
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.TP
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.B MPI_ERR_RANK
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- Invalid source or destination rank. Ranks must be between
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zero and the size of the communicator minus one; ranks in a receive
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(
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.I MPI_Recv
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,
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.I MPI_Irecv
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,
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.I MPI_Sendrecv
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, etc.) may also be
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.I MPI_ANY_SOURCE
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\&.
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.PD 1
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.PD 0
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.TP
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.B MPI_ERR_WIN
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- Invalid MPI window object
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.PD 1
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.SH SEE ALSO
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MPI_Win_allocate_shared
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.br
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