getListContentForData function added to lists helper.
It allows to manually set a list of entities which is to be displayed on the view. Previously, the only function was getListContent, but it retrived data on its own by a single query. The new function can be useful whenever it is impossible or very awkward to obtain entities in such a way (for example more sophisticated SQL statements).
Additionally, the getListContent function is reconstructed so that it collects the data first and then calls getListContentForData.
"""
Portable file locking utilities.
Based partially on example by Jonathan Feignberg <jdf@pobox.com> in the Python
Cookbook, licensed under the Python Software License.
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/65203
Example Usage::
>>> from django.core.files import locks
>>> f = open('./file', 'wb')
>>> locks.lock(f, locks.LOCK_EX)
>>> f.write('Django')
>>> f.close()
"""
__all__ = ('LOCK_EX','LOCK_SH','LOCK_NB','lock','unlock')
system_type = None
try:
import win32con
import win32file
import pywintypes
LOCK_EX = win32con.LOCKFILE_EXCLUSIVE_LOCK
LOCK_SH = 0
LOCK_NB = win32con.LOCKFILE_FAIL_IMMEDIATELY
__overlapped = pywintypes.OVERLAPPED()
system_type = 'nt'
except (ImportError, AttributeError):
pass
try:
import fcntl
LOCK_EX = fcntl.LOCK_EX
LOCK_SH = fcntl.LOCK_SH
LOCK_NB = fcntl.LOCK_NB
system_type = 'posix'
except (ImportError, AttributeError):
pass
def fd(f):
"""Get a filedescriptor from something which could be a file or an fd."""
return hasattr(f, 'fileno') and f.fileno() or f
if system_type == 'nt':
def lock(file, flags):
hfile = win32file._get_osfhandle(fd(file))
win32file.LockFileEx(hfile, flags, 0, -0x10000, __overlapped)
def unlock(file):
hfile = win32file._get_osfhandle(fd(file))
win32file.UnlockFileEx(hfile, 0, -0x10000, __overlapped)
elif system_type == 'posix':
def lock(file, flags):
fcntl.lockf(fd(file), flags)
def unlock(file):
fcntl.lockf(fd(file), fcntl.LOCK_UN)
else:
# File locking is not supported.
LOCK_EX = LOCK_SH = LOCK_NB = None
# Dummy functions that don't do anything.
def lock(file, flags):
pass
def unlock(file):
pass