Python fcntl.F_UNLCK属性代码示例

本文整理汇总了Python中fcntl.F_UNLCK属性的典型用法代码示例。如果您正苦于以下问题:Python fcntl.F_UNLCK属性的具体用法?Python fcntl.F_UNLCK怎么用?Python fcntl.F_UNLCK使用的例子?那么恭喜您, 这里精选的属性代码示例或许可以为您提供帮助。您也可以进一步了解该属性所在模块fcntl的用法示例。

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示例1: lock

# 需要导入模块: import fcntl [as 别名]
# 或者: from fcntl import F_UNLCK [as 别名]
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']) 
开发者ID:apache,项目名称:allura,代码行数:41,代码来源:accessfs.py



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