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Fixed regression in file locking on some platforms. 

Some platforms with os.name == 'posix' do not have the
fcntl module, e.g. AppEngine.

refs #19373.
This commit is contained in:
smallcode 2014-03-17 18:46:58 +08:00 committed by Tim Graham
parent 8520e43e13
commit 61fdb8d487
1 changed files with 23 additions and 23 deletions
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24
django/core/files/locks.py
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@ -85,22 +85,14 @@ if os.name == 'nt':
overlapped = OVERLAPPED()
ret = UnlockFileEx(hfile, 0, 0, 0xFFFF0000, byref(overlapped))
return bool(ret)
elif os.name == 'posix':
else:
try:
import fcntl
LOCK_SH = fcntl.LOCK_SH # shared lock
LOCK_NB = fcntl.LOCK_NB # non-blocking
LOCK_EX = fcntl.LOCK_EX
def lock(f, flags):
ret = fcntl.flock(_fd(f), flags)
return (ret == 0)
def unlock(f):
ret = fcntl.flock(_fd(f), fcntl.LOCK_UN)
return (ret == 0)
else: # File locking is not supported.
except (ImportError, AttributeError):
# File locking is not supported.
LOCK_EX = LOCK_SH = LOCK_NB = 0
# Dummy functions that don't do anything.
@ -111,3 +103,11 @@ else: # File locking is not supported.
def unlock(f):
# File is unlocked
return True
else:
def lock(f, flags):
ret = fcntl.flock(_fd(f), flags)
return (ret == 0)
def unlock(f):
ret = fcntl.flock(_fd(f), fcntl.LOCK_UN)
return (ret == 0)