From 608d8bcdfc1762cde31efdf02a6379a06d7964b1 Mon Sep 17 00:00:00 2001
From: Benjamin Peterson <benjamin@python.org>
Date: Tue, 5 May 2009 23:23:31 +0000
Subject: Merged revisions 72368 via svnmerge from
 svn+ssh://pythondev@svn.python.org/python/trunk

................
  r72368 | benjamin.peterson | 2009-05-05 18:13:58 -0500 (Tue, 05 May 2009) | 53 lines

  Merged revisions 68503,68507,68694,69054,69673,69679-69681,70991,70999,71003,71695 via svnmerge from
  svn+ssh://pythondev@svn.python.org/sandbox/trunk/2to3/lib2to3

  ........
    r68503 | benjamin.peterson | 2009-01-10 14:14:49 -0600 (Sat, 10 Jan 2009) | 1 line

    use variable
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    r68507 | benjamin.peterson | 2009-01-10 15:13:16 -0600 (Sat, 10 Jan 2009) | 1 line

    rewrap
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    r68694 | benjamin.peterson | 2009-01-17 17:55:59 -0600 (Sat, 17 Jan 2009) | 1 line

    test for specific node type
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    r69054 | guilherme.polo | 2009-01-28 10:01:54 -0600 (Wed, 28 Jan 2009) | 2 lines

    Added mapping for the ttk module.
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    r69673 | benjamin.peterson | 2009-02-16 09:38:22 -0600 (Mon, 16 Feb 2009) | 1 line

    fix handling of as imports #5279
  ........
    r69679 | benjamin.peterson | 2009-02-16 11:36:06 -0600 (Mon, 16 Feb 2009) | 1 line

    make Base.get_next_sibling() and Base.get_prev_sibling() properties
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    r69680 | benjamin.peterson | 2009-02-16 11:41:48 -0600 (Mon, 16 Feb 2009) | 1 line

    normalize docstrings in pytree according to PEP 11
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    r69681 | benjamin.peterson | 2009-02-16 11:43:09 -0600 (Mon, 16 Feb 2009) | 1 line

    use a set
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    r70991 | benjamin.peterson | 2009-04-01 15:54:50 -0500 (Wed, 01 Apr 2009) | 1 line

    map urllib.urlopen to urllib.request.open #5637
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    r70999 | benjamin.peterson | 2009-04-01 17:36:47 -0500 (Wed, 01 Apr 2009) | 1 line

    add very alpha support to 2to3 for running concurrently with multiprocessing
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    r71003 | benjamin.peterson | 2009-04-01 18:10:43 -0500 (Wed, 01 Apr 2009) | 1 line

    fix when multiprocessing is not available or used
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    r71695 | benjamin.peterson | 2009-04-17 22:21:29 -0500 (Fri, 17 Apr 2009) | 1 line

    refactor multiprocessing support, so it's less hacky to employ and only loads mp when needed
  ........
................
---
 Lib/lib2to3/refactor.py | 57 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)

(limited to 'Lib/lib2to3/refactor.py')

diff --git a/Lib/lib2to3/refactor.py b/Lib/lib2to3/refactor.py
index c0ba196b74..b679db4f3f 100755
--- a/Lib/lib2to3/refactor.py
+++ b/Lib/lib2to3/refactor.py
@@ -506,6 +506,63 @@ class RefactoringTool(object):
             yield ""
 
 
+class MultiprocessingUnsupported(Exception):
+    pass
+
+
+class MultiprocessRefactoringTool(RefactoringTool):
+
+    def __init__(self, *args, **kwargs):
+        super(MultiprocessRefactoringTool, self).__init__(*args, **kwargs)
+        self.queue = None
+
+    def refactor(self, items, write=False, doctests_only=False,
+                 num_processes=1):
+        if num_processes == 1:
+            return super(MultiprocessRefactoringTool, self).refactor(
+                items, write, doctests_only)
+        try:
+            import multiprocessing
+        except ImportError:
+            raise MultiprocessingUnsupported
+        if self.queue is not None:
+            raise RuntimeError("already doing multiple processes")
+        self.queue = multiprocessing.JoinableQueue()
+        processes = [multiprocessing.Process(target=self._child)
+                     for i in xrange(num_processes)]
+        try:
+            for p in processes:
+                p.start()
+            super(MultiprocessRefactoringTool, self).refactor(items, write,
+                                                              doctests_only)
+        finally:
+            self.queue.join()
+            for i in xrange(num_processes):
+                self.queue.put(None)
+            for p in processes:
+                if p.is_alive():
+                    p.join()
+            self.queue = None
+
+    def _child(self):
+        task = self.queue.get()
+        while task is not None:
+            args, kwargs = task
+            try:
+                super(MultiprocessRefactoringTool, self).refactor_file(
+                    *args, **kwargs)
+            finally:
+                self.queue.task_done()
+            task = self.queue.get()
+
+    def refactor_file(self, *args, **kwargs):
+        if self.queue is not None:
+            self.queue.put((args, kwargs))
+        else:
+            return super(MultiprocessRefactoringTool, self).refactor_file(
+                *args, **kwargs)
+
+
 def diff_texts(a, b, filename):
     """Return a unified diff of two strings."""
     a = a.splitlines()
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