Merged revisions 79307,79408,79430,79533,79542,79579-79580,79585-79587,79607-79608,79622,79717,79820,79822,79828,79862,79875,79923-79924,79941-79943,79945,79947,79951-79952 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/trunk

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  r79307 | florent.xicluna | 2010-03-22 17:45:50 -0500 (Mon, 22 Mar 2010) | 2 lines

  #7667: Fix doctest failures with non-ASCII paths.
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  r79408 | victor.stinner | 2010-03-24 20:18:38 -0500 (Wed, 24 Mar 2010) | 2 lines

  Fix a gcc warning introduced by r79397.
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  r79430 | brian.curtin | 2010-03-25 18:48:54 -0500 (Thu, 25 Mar 2010) | 2 lines

  Fix #6538. Markup RegexObject and MatchObject as classes. Patch by Ryan Arana.
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  r79533 | barry.warsaw | 2010-03-31 16:07:16 -0500 (Wed, 31 Mar 2010) | 6 lines

  - Issue #8233: When run as a script, py_compile.py optionally takes a single
    argument `-` which tells it to read files to compile from stdin.  Each line
    is read on demand and the named file is compiled immediately.  (Original
    patch by Piotr O?\197?\188arowski).
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  r79542 | r.david.murray | 2010-03-31 20:28:39 -0500 (Wed, 31 Mar 2010) | 3 lines

  A couple small grammar fixes in test.rst, and rewrite the
  check_warnings docs to be clearer.
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  r79579 | georg.brandl | 2010-04-02 03:34:41 -0500 (Fri, 02 Apr 2010) | 1 line

  Add 2.6.5.
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  r79580 | georg.brandl | 2010-04-02 03:39:09 -0500 (Fri, 02 Apr 2010) | 1 line

  #2768: add a note on how to get a file descriptor.
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  r79585 | georg.brandl | 2010-04-02 04:03:18 -0500 (Fri, 02 Apr 2010) | 1 line

  Remove col-spanning cells in logging docs.
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  r79586 | georg.brandl | 2010-04-02 04:07:42 -0500 (Fri, 02 Apr 2010) | 1 line

  Document PyImport_ExecCodeModuleEx().
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  r79587 | georg.brandl | 2010-04-02 04:11:49 -0500 (Fri, 02 Apr 2010) | 1 line

  #8012: clarification in generator glossary entry.
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  r79607 | andrew.kuchling | 2010-04-02 12:48:23 -0500 (Fri, 02 Apr 2010) | 1 line

  #6647: document that catch_warnings is not thread-safe
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  r79608 | andrew.kuchling | 2010-04-02 12:54:26 -0500 (Fri, 02 Apr 2010) | 1 line

  #6647: add note to two examples
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  r79622 | tarek.ziade | 2010-04-02 16:34:19 -0500 (Fri, 02 Apr 2010) | 1 line

  removed documentation on code that was reverted and pushed into distutils2
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  r79717 | antoine.pitrou | 2010-04-03 16:22:38 -0500 (Sat, 03 Apr 2010) | 4 lines

  Fix wording / typography, and a slightly misleading statement
  (memoryviews don't support complex structures right now)
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  r79820 | benjamin.peterson | 2010-04-05 22:34:09 -0500 (Mon, 05 Apr 2010) | 1 line

  ready _sre types
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  r79822 | georg.brandl | 2010-04-06 03:18:15 -0500 (Tue, 06 Apr 2010) | 1 line

  #8320: document return value of recv_into().
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  r79828 | georg.brandl | 2010-04-06 09:33:44 -0500 (Tue, 06 Apr 2010) | 1 line

  Add JP.
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  r79862 | georg.brandl | 2010-04-06 15:27:59 -0500 (Tue, 06 Apr 2010) | 1 line

  Fix syntax.
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  r79875 | mark.dickinson | 2010-04-06 17:18:23 -0500 (Tue, 06 Apr 2010) | 1 line

  More NaN consistency doc fixes.
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  r79923 | georg.brandl | 2010-04-10 06:15:24 -0500 (Sat, 10 Apr 2010) | 1 line

  #8360: skipTest was added in 2.7.
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  r79924 | georg.brandl | 2010-04-10 06:16:59 -0500 (Sat, 10 Apr 2010) | 1 line

  #8346: update version.
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  r79941 | andrew.kuchling | 2010-04-10 20:39:36 -0500 (Sat, 10 Apr 2010) | 1 line

  Two grammar fixes
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  r79942 | andrew.kuchling | 2010-04-10 20:40:06 -0500 (Sat, 10 Apr 2010) | 1 line

  Punctuation fix
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  r79943 | andrew.kuchling | 2010-04-10 20:40:30 -0500 (Sat, 10 Apr 2010) | 1 line

  Add various items
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  r79945 | andrew.kuchling | 2010-04-10 20:40:49 -0500 (Sat, 10 Apr 2010) | 1 line

  name correct
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  r79947 | andrew.kuchling | 2010-04-10 20:44:13 -0500 (Sat, 10 Apr 2010) | 1 line

  Remove distutils section
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  r79951 | andrew.kuchling | 2010-04-11 07:48:08 -0500 (Sun, 11 Apr 2010) | 1 line

  Two typo fixes
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  r79952 | andrew.kuchling | 2010-04-11 07:49:37 -0500 (Sun, 11 Apr 2010) | 1 line

  Add two items
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1 files changed, 15 insertions, 2 deletions

diff --git a/Doc/library/warnings.rst b/Doc/library/warnings.rst
index 36d47ad..67d93fa 100644
--- a/Doc/library/warnings.rst
+++ b/Doc/library/warnings.rst
@@ -180,7 +180,10 @@ the warning using the :class:`catch_warnings` context manager::
 While within the context manager all warnings will simply be ignored. This
 allows you to use known-deprecated code without having to see the warning while
 not suppressing the warning for other code that might not be aware of its use
-of deprecated code.
+of deprecated code.  Note: this can only be guaranteed in a single-threaded
+application. If two or more threads use the :class:`catch_warnings` context
+manager at the same time, the behavior is undefined.
+
 
 
 .. _warning-testing:
@@ -218,7 +221,9 @@ Once the context manager exits, the warnings filter is restored to its state
 when the context was entered. This prevents tests from changing the warnings
 filter in unexpected ways between tests and leading to indeterminate test
 results. The :func:`showwarning` function in the module is also restored to
-its original value.
+its original value.  Note: this can only be guaranteed in a single-threaded
+application. If two or more threads use the :class:`catch_warnings` context
+manager at the same time, the behavior is undefined.
 
 When testing multiple operations that raise the same kind of warning, it
 is important to test them in a manner that confirms each operation is raising
@@ -337,3 +342,11 @@ Available Context Managers
     module returned when you import :mod:`warnings` whose filter will be
     protected. This argument exists primarily for testing the :mod:`warnings`
     module itself.
+
+    .. 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.