Whitespace normalization.

Demo/threads/bug.py

@@ -1,12 +1,12 @@
 # The following self-contained little program usually freezes with most
 # threads reporting
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+#
 # Unhandled exception in thread:
 # Traceback (innermost last):
 #   File "importbug.py", line 6
 #     x = whrandom.randint(1,3)
 # AttributeError: randint
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+#
 # Here's the program; it doesn't use anything from the attached module:
 
 import thread
@@ -33,37 +33,37 @@ print 'done'
 
 # Sticking an acquire/release pair around the 'import' statement makes the
 # problem go away.
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+#
 # I believe that what happens is:
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+#
 # 1) The first thread to hit the import atomically reaches, and executes
 #    most of, get_module.  In particular, it finds Lib/whrandom.pyc,
 #    installs its name in sys.modules, and executes
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+#
 #         v = eval_code(co, d, d, d, (object *)NULL);
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+#
 #    to initialize the module.
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+#
 # 2) eval_code "ticker"-slices the 1st thread out, and gives another thread
 #    a chance.  When this 2nd thread hits the same 'import', import_module
 #    finds 'whrandom' in sys.modules, so just proceeds.
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+#
 # 3) But the 1st thread is still "in the middle" of executing whrandom.pyc.
 #    So the 2nd thread has a good chance of trying to look up 'randint'
 #    before the 1st thread has placed it in whrandom's dict.
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+#
 # 4) The more threads there are, the more likely that at least one of them
 #    will do this before the 1st thread finishes the import work.
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+#
 # If that's right, a perhaps not-too-bad workaround would be to introduce a
 # static "you can't interrupt this thread" flag in ceval.c, check it before
 # giving up interpreter_lock, and have IMPORT_NAME set it & restore (plain
 # clearing would not work) it around its call to import_module.  To its
 # credit, there's something wonderfully perverse about fixing a race via an
 # unprotected static <grin>.
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+#
 # as-with-most-other-things-(pseudo-)parallel-programming's-more-fun-
 #    in-python-too!-ly y'rs  - tim
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+#
 # Tim Peters   tim@ksr.com
 # not speaking for Kendall Square Research Corp