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| author | Raymond Hettinger <python@rcn.com> | 2011-01-17 21:05:07 (GMT) |
|---|---|---|
| committer | Raymond Hettinger <python@rcn.com> | 2011-01-17 21:05:07 (GMT) |
| commit | 15b47c5d7f8e3fb3021185d00eb9032de824920b (patch) | |
| tree | d276010753088b832d4a44594f90276f4cbe16b6 /Doc/whatsnew/3.2.rst | |
| parent | 37b9e46a04452274b31db71d75b141af0b48997e (diff) | |
| download | cpython-15b47c5d7f8e3fb3021185d00eb9032de824920b.zip cpython-15b47c5d7f8e3fb3021185d00eb9032de824920b.tar.gz cpython-15b47c5d7f8e3fb3021185d00eb9032de824920b.tar.bz2 | |
Note that two-phase cyclic barriers are suitable for use in loops.
Diffstat (limited to 'Doc/whatsnew/3.2.rst')
| -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 |