DragonFly On-Line Manual Pages
MPI_Win_post(3) MPI MPI_Win_post(3)
MPI_Win_post - Start an RMA exposure epoch
int MPI_Win_post(MPI_Group group, int assert, MPI_Win win)
group - group of origin processes (handle)
assert - Used to optimize this call; zero may be used as a default.
See notes. (integer)
win - window object (handle)
The assert argument is used to indicate special conditions for the
fence that an implementation may use to optimize the MPI_Win_post
operation. The value zero is always correct. Other assertion values
may be or'ed together. Assertions that are valid for MPI_Win_post are:
- the matching calls to MPI_WIN_START have not yet occurred on
any origin processes when the call to MPI_WIN_POST is made. The
nocheck option can be specified by a post call if and only if it
is specified by each matching start call.
- the local window was not updated by local stores (or local get
or receive calls) since last synchronization. This may avoid the
need for cache synchronization at the post call.
- the local window will not be updated by put or accumulate
calls after the post call, until the ensuing (wait)
synchronization. This may avoid the need for cache
synchronization at the wait call.
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
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 guarentee that an MPI
program can continue past an error; however, MPI implementations will
attempt to continue whenever possible.
- No error; MPI routine completed successfully.