本文整理匯總了Python中fcntl.F_RDLCK屬性的典型用法代碼示例。如果您正苦於以下問題：Python fcntl.F_RDLCK屬性的具體用法？Python fcntl.F_RDLCK怎麽用？Python fcntl.F_RDLCK使用的例子？那麽, 這裏精選的屬性代碼示例或許可以為您提供幫助。您也可以進一步了解該屬性所在類fcntl的用法示例。
在下文中一共展示了fcntl.F_RDLCK屬性的1個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的Python代碼示例。
示例1: lock
# 需要導入模塊: import fcntl [as 別名]
# 或者: from fcntl import F_RDLCK [as 別名]
def lock(self, cmd, owner, **kw):
# The code here is much rather just a demonstration of the locking
# API than something which actually was seen to be useful.
# Advisory file locking is pretty messy in Unix, and the Python
# interface to this doesn't make it better.
# We can't do fcntl(2)/F_GETLK from Python in a platfrom independent
# way. The following implementation *might* work under Linux.
#
# if cmd == fcntl.F_GETLK:
# import struct
#
# lockdata = struct.pack('hhQQi', kw['l_type'], os.SEEK_SET,
# kw['l_start'], kw['l_len'], kw['l_pid'])
# ld2 = fcntl.fcntl(self.fd, fcntl.F_GETLK, lockdata)
# flockfields = ('l_type', 'l_whence', 'l_start', 'l_len', 'l_pid')
# uld2 = struct.unpack('hhQQi', ld2)
# res = {}
# for i in xrange(len(uld2)):
# res[flockfields[i]] = uld2[i]
#
# return fuse.Flock(**res)
# Convert fcntl-ish lock parameters to Python's weird
# lockf(3)/flock(2) medley locking API...
op = {fcntl.F_UNLCK: fcntl.LOCK_UN,
fcntl.F_RDLCK: fcntl.LOCK_SH,
fcntl.F_WRLCK: fcntl.LOCK_EX}[kw['l_type']]
if cmd == fcntl.F_GETLK:
return -errno.EOPNOTSUPP
elif cmd == fcntl.F_SETLK:
if op != fcntl.LOCK_UN:
op |= fcntl.LOCK_NB
elif cmd == fcntl.F_SETLKW:
pass
else:
return -errno.EINVAL
fcntl.lockf(self.fd, op, kw['l_start'], kw['l_len'])