Mercurial > cpython-lru_cache-weakref

annotate Lib/dircache.py @ 25838:8540887bcec6 2.2

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Backport of 2.183: Fix memory leak in add_subclass() found by NealN with valgrind.
author Guido van Rossum <guido@python.org>
date Fri, 18 Oct 2002 13:42:21 +0000
parents 743296ce052b
children 65cf478950ff
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 """Read and cache directory listings.
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2
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3 The listdir() routine returns a sorted list of the files in a directory,
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4 using a cache to avoid reading the directory more often than necessary.
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5 The annotate() routine appends slashes to directories."""
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6
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7 import os
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9 __all__ = ["listdir", "opendir", "annotate", "reset"]
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11 cache = {}
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12
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13 def reset():
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14 """Reset the cache completely."""
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15 global cache
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16 cache = {}
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17
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18 def listdir(path):
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19 """List directory contents, using cache."""
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20 try:
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21 cached_mtime, list = cache[path]
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22 del cache[path]
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23 except KeyError:
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24 cached_mtime, list = -1, []
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25 try:
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26 mtime = os.stat(path)[8]
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27 except os.error:
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28 return []
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29 if mtime != cached_mtime:
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30 try:
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31 list = os.listdir(path)
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32 except os.error:
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33 return []
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34 list.sort()
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35 cache[path] = mtime, list
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36 return list
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37
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38 opendir = listdir # XXX backward compatibility
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39
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40 def annotate(head, list):
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41 """Add '/' suffixes to directories."""
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42 for i in range(len(list)):
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43 if os.path.isdir(os.path.join(head, list[i])):
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44 list[i] = list[i] + '/'