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| -rw-r--r-- | Doc/whatsnew/3.2.rst | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/Doc/whatsnew/3.2.rst b/Doc/whatsnew/3.2.rst index e342b87..bdcf588 100644 --- a/Doc/whatsnew/3.2.rst +++ b/Doc/whatsnew/3.2.rst @@ -834,8 +834,10 @@ Barriers can work with an arbitrary number of threads. This is a generalization of a `Rendezvous <http://en.wikipedia.org/wiki/Synchronous_rendezvous>`_ which is defined for only two threads. -The barrier is designed to be cyclic, making it reusable once all of the -waiting threads are released. +Implemented as a two-phase cyclic barrier, :class:`~threading.Barrier` objects +are suitable for use in loops. The separate *filling* and *draining* phases +assure that all threads get released (drained) before any one them can loop back +and re-enter the barrier. The barrier fully resets after each cycle. If any of the predecessor tasks can hang or be delayed, a barrier can be created with an optional *timeout* parameter. Then if the timeout period elapses before |