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MPI_Win_unlock(3OpenMPI)                                                            MPI_Win_unlock(3OpenMPI)



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  con-current concurrent
       current  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





Open MPI 1.2                                     March 2007                         MPI_Win_unlock(3OpenMPI)