Mercurial > cpython-lru_cache-weakref

annotate Lib/test/subprocessdata/fd_status.py @ 87690:66c1c9f32567 default tip

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Add use_weakref option to functools.lru_cache The use_weakref option makes lru_cache create weak references to the function arguments when creating the cache key, which prevents them from staying in the memory forever even after all other references to them are gone. This is a proof of concept for http://bugs.python.org/issue19859
author Radomir Dopieralski <devel@sheep.art.pl>
date Tue, 03 Dec 2013 16:02:48 +0100
parents c27527dce71e
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 """When called as a script, print a comma-separated list of the open
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2 file descriptors on stdout.
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3
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4 Usage:
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5 fd_stats.py: check all file descriptors
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6 fd_status.py fd1 fd2 ...: check only specified file descriptors
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7 """
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8
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9 import errno
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10 import os
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11 import stat
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12 import sys
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13
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14 if __name__ == "__main__":
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15 fds = []
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16 if len(sys.argv) == 1:
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17 try:
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18 _MAXFD = os.sysconf("SC_OPEN_MAX")
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19 except:
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20 _MAXFD = 256
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21 test_fds = range(0, _MAXFD)
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22 else:
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23 test_fds = map(int, sys.argv[1:])
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24 for fd in test_fds:
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25 try:
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26 st = os.fstat(fd)
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27 except OSError as e:
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28 if e.errno == errno.EBADF:
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29 continue
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30 raise
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31 # Ignore Solaris door files
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32 if not stat.S_ISDOOR(st.st_mode):
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33 fds.append(fd)
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34 print(','.join(map(str, fds)))