Mercurial > cpython-lru_cache-weakref

changeset 60171:1ff8dd67be82 legacy-trunk

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
#6647: document that catch_warnings is not thread-safe
author Andrew M. Kuchling <amk@amk.ca>
date Fri, 02 Apr 2010 17:48:23 +0000
parents 43a837d2728a
children 2f5dc2fa0e56
files Doc/library/warnings.rst
diffstat 1 files changed, 8 insertions(+), 0 deletions(-) [+]
line wrap: on
line diff
--- a/Doc/library/warnings.rst	Fri Apr 02 17:26:42 2010 +0000
+++ b/Doc/library/warnings.rst	Fri Apr 02 17:48:23 2010 +0000
@@ -383,6 +383,14 @@
 
     .. note::
 
+        The :class:`catch_warnings` manager works by replacing and
+        then later restoring the module's
+        :func:`showwarning` function and internal list of filter
+        specifications.  This means the context manager is modifying
+        global state and therefore is not thread-safe.
+
+    .. note::
+
         In Python 3.0, the arguments to the constructor for
         :class:`catch_warnings` are keyword-only arguments.