MPI_Win_fence(3) MPI MPI_Win_fence(3)NAMEMPI_Win_fence - Perform an MPI fence synchronization on a MPI window
SYNOPSIS
int MPI_Win_fence(int assert, MPI_Win win)
INPUT PARAMETERS
assert - program assertion (integer)
win - window object (handle)
NOTES
The assert argument is used to indicate special conditions for the
fence that an implementation may use to optimize the MPI_Win_fence
operation. The value zero is always correct. Other assertion values
may be or'ed together. Assertions that are valid for MPI_Win_fence
are:
MPI_MODE_NOSTORE
- the local window was not updated by local stores (or local get
or receive calls) since last synchronization.
MPI_MODE_NOPUT
- the local window will not be updated by put or accumulate
calls after the fence call, until the ensuing (fence) synchro‐
nization.
MPI_MODE_NOPRECEDE
- the fence does not complete any sequence of locally issued RMA
calls. If this assertion is given by any process in the window
group, then it must be given by all processes in the group.
MPI_MODE_NOSUCCEED
- the fence does not start any sequence of locally issued RMA
calls. If the assertion is given by any process in the window
group, then it must be given by all processes in the group.
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 com‐
municators), 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 prede‐
fined 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.
MPI_SUCCESS
- No error; MPI routine completed successfully.
MPI_ERR_OTHER
- Other error; use MPI_Error_string to get more information
about this error code.
MPI_ERR_WIN
- Invalid MPI window object
LOCATION
src/mpi/rma/win_fence.c
9/20/2012 MPI_Win_fence(3)
