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| -rw-r--r-- | Doc/library/threading.rst | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Doc/library/threading.rst b/Doc/library/threading.rst index ec235046ce..00ae3ec095 100644 --- a/Doc/library/threading.rst +++ b/Doc/library/threading.rst @@ -174,6 +174,12 @@ initial value is inherited from the creating thread. The flag can be set through the :attr:`~Thread.daemon` property or the *daemon* constructor argument. +.. note:: + Daemon threads are abruptly stopped at shutdown. Their resources (such + as open files, database transactions, etc.) may not be released properly. + If you want your threads to stop gracefully, make them non-daemonic and + use a suitable signalling mechanism such as an :class:`Event`. + There is a "main thread" object; this corresponds to the initial thread of control in the Python program. It is not a daemon thread. |