Mercurial > cpython-lru_cache-weakref

annotate Lib/lockfile.py @ 5817:48b94de85bf3 legacy-trunk

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Extensive changes by AMK.
author Guido van Rossum <guido@python.org>
date Thu, 17 Jul 1997 16:29:42 +0000
parents c2ff2163f0b7
children
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1604
c2ff2163f0b7 Module to lock open files using fcntl()
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1 import struct, fcntl, FCNTL
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2
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3 def writelock(f):
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4 _lock(f, FCNTL.F_WRLCK)
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5
c2ff2163f0b7 Module to lock open files using fcntl()
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6 def readlock(f):
c2ff2163f0b7 Module to lock open files using fcntl()
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7 _lock(f, FCNTL.F_RDLCK)
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8
c2ff2163f0b7 Module to lock open files using fcntl()
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9 def unlock(f):
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10 _lock(f, FCNTL.F_UNLCK)
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11
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12 def _lock(f, op):
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13 dummy = fcntl.fcntl(f.fileno(), FCNTL.F_SETLKW,
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14 struct.pack('2h8l', op,
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15 0, 0, 0, 0, 0, 0, 0, 0, 0))