MPI_Win_unlock(3)                  Open MPI                  MPI_Win_unlock(3)



NAME
       MPI_Win_unlock - Completes an RMA access epoch started by a call to
       MPI_Win_lock.


SYNTAX
C Syntax
       #include <mpi.h>
       int MPI_Win_unlock(int rank, MPI_Win win)


Fortran Syntax
       INCLUDE 'mpif.h'
       MPI_WIN_UNLOCK(RANK, WIN, IERROR)
            INTEGER RANK, WIN, IERROR


C++ Syntax
       #include <mpi.h>
       void MPI::Win::Unlock(int rank) const


INPUT PARAMETERS
       rank      Rank of window (nonnegative integer).

       win       Window object (handle).


OUTPUT PARAMETER
       IERROR    Fortran only: Error status (integer).


DESCRIPTION
       MPI_Win_unlock completes an RMA access epoch started by a call to
       MPI_Win_lock. RMA operations issued during this period will have
       completed both at the origin and at the target when the call returns.

       Locks are used to protect accesses to the locked target window effected
       by RMA calls issued between the lock and unlock call, and to protect
       local load/store accesses to a locked local window executed between the
       lock and unlock call. Accesses that are protected by an exclusive lock
       will not be concurrent at the window site with other accesses to the
       same window that are lock protected. Accesses that are protected by a
       shared lock will not be concurrent at the window site with accesses
       protected by an exclusive lock to the same window.


ERRORS
       Almost all MPI routines return an error value; C routines as the value
       of the function and Fortran routines in the last argument. C++
       functions do not return errors. If the default error handler is set to
       MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism
       will be used to throw an MPI:Exception object.

       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.


SEE ALSO
       MPI_Win_lock





1.4.1                            Jan 14, 2010                MPI_Win_unlock(3)
