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| author | Guido van Rossum <guido@python.org> | 1994-05-03 14:46:18 (GMT) |
|---|---|---|
| committer | Guido van Rossum <guido@python.org> | 1994-05-03 14:46:18 (GMT) |
| commit | 19806f4ce287333288f4b02e2da5413992e036b1 (patch) | |
| tree | 43cc4ed2e9ed0cbd3914da000d900c8479411be0 /Lib/lockfile.py | |
| parent | f13285271f61b05a62fee46c399b84700d1eac49 (diff) | |
| download | cpython-19806f4ce287333288f4b02e2da5413992e036b1.zip cpython-19806f4ce287333288f4b02e2da5413992e036b1.tar.gz cpython-19806f4ce287333288f4b02e2da5413992e036b1.tar.bz2 | |
Module to lock open files using fcntl()
Diffstat (limited to 'Lib/lockfile.py')
| -rw-r--r-- | Lib/lockfile.py | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/Lib/lockfile.py b/Lib/lockfile.py new file mode 100644 index 0000000..3a251d7 --- /dev/null +++ b/Lib/lockfile.py @@ -0,0 +1,15 @@ +import struct, fcntl, FCNTL + +def writelock(f): + _lock(f, FCNTL.F_WRLCK) + +def readlock(f): + _lock(f, FCNTL.F_RDLCK) + +def unlock(f): + _lock(f, FCNTL.F_UNLCK) + +def _lock(f, op): + dummy = fcntl.fcntl(f.fileno(), FCNTL.F_SETLKW, + struct.pack('2h8l', op, + 0, 0, 0, 0, 0, 0, 0, 0, 0)) |