Synopsis
int MPI_Win_allocate(MPI_Aint size, int disp_unit, MPI_Info info, MPI_Comm comm,
void *baseptr, MPI_Win *win)int MPI_Win_allocate_c(MPI_Aint size, MPI_Aint disp_unit, MPI_Info info,
MPI_Comm comm, void *baseptr, MPI_Win *win)Input Parameters
- size
-
size of window in bytes (non-negative integer)
- disp_unit
-
local unit size for displacements, in bytes (positive integer)
- info
-
info argument (handle)
- comm
-
intra-communicator (handle)
Output Parameters
- baseptr
-
initial address of window (choice)
- win
-
window object returned by call (handle)
Thread and Interrupt Safety
This routine is thread-safe. This means that this routine may be safely used by multiple threads without the need for any user-provided thread locks. However, the routine is not interrupt safe. Typically, this is due to the use of memory allocation routines such as 'malloc' or other non-MPICH runtime routines that are themselves not interrupt-safe.
Notes for Fortran
All MPI routines in Fortran (except for 'MPI_WTIME' and 'MPI_WTICK') have an additional argument 'ierr' at the end of the argument list. 'ierr' is an integer and has the same meaning as the return value of the routine in C. In Fortran, MPI routines are subroutines, and are invoked with the 'call' statement.
All MPI objects (e.g., 'MPI_Datatype', 'MPI_Comm') are of type 'INTEGER' in Fortran.
Errors
All MPI routines (except 'MPI_Wtime' and 'MPI_Wtick') return an error value;
C routines as the value of the function and Fortran routines in the last
argument. Before the value is returned, the current MPI error handler is
called. By default, this error handler aborts the MPI job. The error handler
may be changed with 'MPI_Comm_set_errhandler' (for communicators),
'MPI_File_set_errhandler' (for files), and 'MPI_Win_set_errhandler' (for
RMA windows). The MPI-1 routine 'MPI_Errhandler_set' may be used but
its use is deprecated. 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; however, MPI implementations will attempt to continue whenever
possible.
-
MPI_SUCCESS - No error; MPI routine completed successfully.
-
MPI_ERR_ARG - Invalid argument. Some argument is invalid and is not identified by a specific error class (e.g., 'MPI_ERR_RANK').
-
MPI_ERR_COMM - Invalid communicator. A common error is to use a null communicator in a call (not even allowed in 'MPI_Comm_rank').
-
MPI_ERR_DISP - Invalid displacement argument
-
MPI_ERR_INFO - Invalid Info
-
MPI_ERR_SIZE - Invalid size argument
-
MPI_ERR_OTHER - Other error; use 'MPI_Error_string' to get more information about this error code.