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<TITLE>MPI_Win_lock_all</TITLE>
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MPI_Win_lock_all
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Begin an RMA access epoch at all processes on the given window.
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Synopsis
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int MPI_Win_lock_all(int assert, MPI_Win win)
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Starts an RMA access epoch to all processes in win, with a lock type of
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<tt>MPI_Lock_shared</tt>. During the epoch, the calling process can access the window
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memory on all processes in win by using RMA operations. A window locked with
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<tt>MPI_Win_lock_all</tt> must be unlocked with <tt>MPI_Win_unlock_all</tt>. This routine is not
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collective -- the ALL refers to a lock on all members of the group of the
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window.
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Input Parameters
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assert Used to optimize this call; zero may be used as a default.
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See notes. (integer)
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win window object (handle)
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Notes
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This call is not collective.
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The <tt>assert</tt> argument is used to indicate special conditions for the fence that
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an implementation may use to optimize the <tt>MPI_Win_lock_all</tt> operation. The
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value zero is always correct. Other assertion values may be or'ed together.
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Assertions that are valid for <tt>MPI_Win_lock_all</tt> are:
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<tt>MPI_MODE_NOCHECK</tt> No other process holds, or will attempt to acquire a
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conflicting lock, while the caller holds the window lock. This is useful
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when mutual exclusion is achieved by other means, but the coherence
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operations that may be attached to the lock and unlock calls are still
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required.
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There may be additional overheads associated with using <tt>MPI_Win_lock</tt> and
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<tt>MPI_Win_lock_all</tt> concurrently on the same window. These overheads could be
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avoided by specifying the assertion <tt>MPI_MODE_NOCHECK</tt> when possible
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Thread and Interrupt Safety
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This routine is thread-safe. This means that this routine may be
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safely used by multiple threads without the need for any user-provided
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thread locks. However, the routine is not interrupt safe. Typically,
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this is due to the use of memory allocation routines such as <tt>malloc
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</tt>or other non-MPICH runtime routines that are themselves not interrupt-safe.
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Notes for Fortran
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All MPI routines in Fortran (except for <tt>MPI_WTIME</tt> and <tt>MPI_WTICK</tt>) have
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an additional argument <tt>ierr</tt> at the end of the argument list. <tt>ierr
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</tt>is an integer and has the same meaning as the return value of the routine
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in C. In Fortran, MPI routines are subroutines, and are invoked with the
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<tt>call</tt> statement.
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All MPI objects (e.g., <tt>MPI_Datatype</tt>, <tt>MPI_Comm</tt>) are of type <tt>INTEGER
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</tt>in Fortran.
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Errors
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All MPI routines (except <tt>MPI_Wtime</tt> and <tt>MPI_Wtick</tt>) return an error value;
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C routines as the value of the function and Fortran routines in the last
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argument. Before the value is returned, the current MPI error handler is
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called. By default, this error handler aborts the MPI job. The error handler
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may be changed with <tt>MPI_Comm_set_errhandler</tt> (for communicators),
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<tt>MPI_File_set_errhandler</tt> (for files), and <tt>MPI_Win_set_errhandler</tt> (for
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RMA windows). The MPI-1 routine <tt>MPI_Errhandler_set</tt> may be used but
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its use is deprecated. The predefined error handler
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<tt>MPI_ERRORS_RETURN</tt> may be used to cause error values to be returned.
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Note that MPI does not guarentee that an MPI program can continue past
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an error; however, MPI implementations will attempt to continue whenever
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possible.
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MPI_SUCCESS No error; MPI routine completed successfully.
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MPI_ERR_RANK Invalid source or destination rank. Ranks must be between
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zero and the size of the communicator minus one; ranks in a receive
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(<tt>MPI_Recv</tt>, <tt>MPI_Irecv</tt>, <tt>MPI_Sendrecv</tt>, etc.) may also be <tt>MPI_ANY_SOURCE</tt>.
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MPI_ERR_WIN Invalid MPI window object
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MPI_ERR_OTHER Other error; use <tt>MPI_Error_string</tt> to get more information
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about this error code.
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See Also
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MPI_Win_unlock_all
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