Python win32file.LockFileEx方法代码示例

# 需要导入模块: import win32file [as 别名]
# 或者: from win32file import LockFileEx [as 别名]
def _LockImplWin(target_file, flags):
  hfile = win32file._get_osfhandle(target_file.fileno())
  try:
    win32file.LockFileEx(hfile, flags, 0, -0x10000, _OVERLAPPED)
  except pywintypes.error, exc_value:
    if exc_value[0] == 33:
      raise LockException('Error trying acquiring lock of %s: %s' %
                          (target_file.name, exc_value[2]))
    else:
      raise 

# 需要导入模块: import win32file [as 别名]
# 或者: from win32file import LockFileEx [as 别名]
def _acquire_lock(self, for_save=False):
        assert self.__locked_fh is None, 'double lock'

        while True:
            try:
                fd = os.open(self._store,
                             os.O_RDWR | (os.O_CREAT * int(for_save)))
            except FileNotFoundError:
                if not for_save:
                    raise qubes.exc.QubesException(
                        'Qubes XML store {!r} is missing; '
                        'use qubes-create tool'.format(self._store))
                raise

            # While we were waiting for lock, someone could have unlink()ed
            # (or rename()d) our file out of the filesystem. We have to
            # ensure we got lock on something linked to filesystem.
            # If not, try again.
            if os.fstat(fd) != os.stat(self._store):
                os.close(fd)
                continue

            if self.__load_timestamp and \
                    os.path.getmtime(self._store) != self.__load_timestamp:
                os.close(fd)
                raise qubes.exc.QubesException(
                    'Someone else modified qubes.xml in the meantime')

            break

        if os.name == 'posix':
            fcntl.lockf(fd, fcntl.LOCK_EX)
        elif os.name == 'nt':
            # pylint: disable=protected-access
            overlapped = pywintypes.OVERLAPPED()
            win32file.LockFileEx(
                win32file._get_osfhandle(fd),
                win32con.LOCKFILE_EXCLUSIVE_LOCK, 0, -0x10000, overlapped)

        self.__locked_fh = os.fdopen(fd, 'r+b')
        return self.__locked_fh 

# 需要导入模块: import win32file [as 别名]
# 或者: from win32file import LockFileEx [as 别名]
def lock(file, flags):
        hfile = win32file._get_osfhandle(_getfd(file))
        try:
            win32file.LockFileEx(hfile, flags, 0, -0x10000, __overlapped)
        except pywintypes.error, exc_value:
            # error: (33, 'LockFileEx', 'The process cannot access the file because another process has locked a portion of the file.')
            if exc_value[0] == 33:
                raise LockException(LockException.LOCK_FAILED, exc_value[2])
            else:
                # Q:  Are there exceptions/codes we should be dealing with here?
                raise 

# 需要导入模块: import win32file [as 别名]
# 或者: from win32file import LockFileEx [as 别名]
def lock(file, flags):
        hfile = win32file._get_osfhandle(fd(file))
        win32file.LockFileEx(hfile, flags, 0, -0x10000, __overlapped) 

# 需要导入模块: import win32file [as 别名]
# 或者: from win32file import LockFileEx [as 别名]
def lock(file, flags):
        hfile = win32file._get_osfhandle(file.fileno())
        win32file.LockFileEx(hfile, flags, 0, 0x7fff0000, __overlapped) 

# 需要导入模块: import win32file [as 别名]
# 或者: from win32file import LockFileEx [as 别名]
def lock(file, flags):
        hfile = win32file._get_osfhandle(file.fileno())
        try:
            win32file.LockFileEx(hfile, flags, 0, -0x10000, __overlapped)
        except pywintypes.error, exc_value:
            # error: (33, 'LockFileEx', 'The process cannot access the file because another process has locked a portion of the file.')
            if exc_value[0] == 33:
                raise LockException(LockException.LOCK_FAILED, exc_value[2])
            else:
                # Q:  Are there exceptions/codes we should be dealing with here?
                raise 

# 需要导入模块: import win32file [as 别名]
# 或者: from win32file import LockFileEx [as 别名]
def open_and_lock(self, timeout, delay):
      """Open the file and lock it.

      Args:
        timeout: float, How long to try to lock for.
        delay: float, How long to wait between retries

      Raises:
        AlreadyLockedException: if the lock is already acquired.
        IOError: if the open fails.
        CredentialsFileSymbolicLinkError if the file is a symbolic link.
      """
      if self._locked:
        raise AlreadyLockedException('File %s is already locked' %
                                     self._filename)
      start_time = time.time()

      validate_file(self._filename)
      try:
        self._fh = open(self._filename, self._mode)
      except IOError as e:
        # If we can't access with _mode, try _fallback_mode and don't lock.
        if e.errno == errno.EACCES:
          self._fh = open(self._filename, self._fallback_mode)
          return

      # We opened in _mode, try to lock the file.
      while True:
        try:
          hfile = win32file._get_osfhandle(self._fh.fileno())
          win32file.LockFileEx(
              hfile,
              (win32con.LOCKFILE_FAIL_IMMEDIATELY|
               win32con.LOCKFILE_EXCLUSIVE_LOCK), 0, -0x10000,
              pywintypes.OVERLAPPED())
          self._locked = True
          return
        except pywintypes.error as e:
          if timeout == 0:
            raise e

          # If the error is not that the file is already in use, raise.
          if e[0] != _Win32Opener.FILE_IN_USE_ERROR:
            raise

          # We could not acquire the lock. Try again.
          if (time.time() - start_time) >= timeout:
            logger.warn('Could not lock %s in %s seconds' % (
                self._filename, timeout))
            if self._fh:
              self._fh.close()
            self._fh = open(self._filename, self._fallback_mode)
            return
          time.sleep(delay) 

# 需要导入模块: import win32file [as 别名]
# 或者: from win32file import LockFileEx [as 别名]
def open_and_lock(self, timeout, delay):
        """Open the file and lock it.

        Args:
            timeout: float, How long to try to lock for.
            delay: float, How long to wait between retries

        Raises:
            AlreadyLockedException: if the lock is already acquired.
            IOError: if the open fails.
            CredentialsFileSymbolicLinkError: if the file is a symbolic
                                              link.
        """
        if self._locked:
            raise AlreadyLockedException('File %s is already locked' %
                                         self._filename)
        start_time = time.time()

        validate_file(self._filename)
        try:
            self._fh = open(self._filename, self._mode)
        except IOError as e:
            # If we can't access with _mode, try _fallback_mode
            # and don't lock.
            if e.errno == errno.EACCES:
                self._fh = open(self._filename, self._fallback_mode)
                return

        # We opened in _mode, try to lock the file.
        while True:
            try:
                hfile = win32file._get_osfhandle(self._fh.fileno())
                win32file.LockFileEx(
                    hfile,
                    (win32con.LOCKFILE_FAIL_IMMEDIATELY |
                     win32con.LOCKFILE_EXCLUSIVE_LOCK), 0, -0x10000,
                    pywintypes.OVERLAPPED())
                self._locked = True
                return
            except pywintypes.error as e:
                if timeout == 0:
                    raise

                # If the error is not that the file is already
                # in use, raise.
                if e[0] != _Win32Opener.FILE_IN_USE_ERROR:
                    raise

                # We could not acquire the lock. Try again.
                if (time.time() - start_time) >= timeout:
                    logger.warn('Could not lock %s in %s seconds' % (
                        self._filename, timeout))
                    if self._fh:
                        self._fh.close()
                    self._fh = open(self._filename, self._fallback_mode)
                    return
                time.sleep(delay) 

# 需要导入模块: import win32file [as 别名]
# 或者: from win32file import LockFileEx [as 别名]
def open_and_lock(self, timeout, delay):
        """Open the file and lock it.

        Args:
            timeout: float, How long to try to lock for.
            delay: float, How long to wait between retries

        Raises:
            AlreadyLockedException: if the lock is already acquired.
            IOError: if the open fails.
            CredentialsFileSymbolicLinkError: if the file is a symbolic
                                              link.
        """
        if self._locked:
            raise locked_file.AlreadyLockedException(
                'File {0} is already locked'.format(self._filename))
        start_time = time.time()

        locked_file.validate_file(self._filename)
        try:
            self._fh = open(self._filename, self._mode)
        except IOError as e:
            # If we can't access with _mode, try _fallback_mode
            # and don't lock.
            if e.errno == errno.EACCES:
                self._fh = open(self._filename, self._fallback_mode)
                return

        # We opened in _mode, try to lock the file.
        while True:
            try:
                hfile = win32file._get_osfhandle(self._fh.fileno())
                win32file.LockFileEx(
                    hfile,
                    (win32con.LOCKFILE_FAIL_IMMEDIATELY |
                     win32con.LOCKFILE_EXCLUSIVE_LOCK), 0, -0x10000,
                    pywintypes.OVERLAPPED())
                self._locked = True
                return
            except pywintypes.error as e:
                if timeout == 0:
                    raise

                # If the error is not that the file is already
                # in use, raise.
                if e[0] != _Win32Opener.FILE_IN_USE_ERROR:
                    raise

                # We could not acquire the lock. Try again.
                if (time.time() - start_time) >= timeout:
                    locked_file.logger.warn('Could not lock %s in %s seconds',
                                            self._filename, timeout)
                    if self._fh:
                        self._fh.close()
                    self._fh = open(self._filename, self._fallback_mode)
                    return
                time.sleep(delay) 

# 需要导入模块: import win32file [as 别名]
# 或者: from win32file import LockFileEx [as 别名]
def open_and_lock(self, timeout, delay):
            """Open the file and lock it.

            Args:
                timeout: float, How long to try to lock for.
                delay: float, How long to wait between retries

            Raises:
                AlreadyLockedException: if the lock is already acquired.
                IOError: if the open fails.
                CredentialsFileSymbolicLinkError: if the file is a symbolic
                                                  link.
            """
            if self._locked:
                raise AlreadyLockedException('File %s is already locked' %
                                             self._filename)
            start_time = time.time()

            validate_file(self._filename)
            try:
                self._fh = open(self._filename, self._mode)
            except IOError as e:
                # If we can't access with _mode, try _fallback_mode
                # and don't lock.
                if e.errno == errno.EACCES:
                    self._fh = open(self._filename, self._fallback_mode)
                    return

            # We opened in _mode, try to lock the file.
            while True:
                try:
                    hfile = win32file._get_osfhandle(self._fh.fileno())
                    win32file.LockFileEx(
                        hfile,
                        (win32con.LOCKFILE_FAIL_IMMEDIATELY |
                         win32con.LOCKFILE_EXCLUSIVE_LOCK), 0, -0x10000,
                        pywintypes.OVERLAPPED())
                    self._locked = True
                    return
                except pywintypes.error as e:
                    if timeout == 0:
                        raise

                    # If the error is not that the file is already
                    # in use, raise.
                    if e[0] != _Win32Opener.FILE_IN_USE_ERROR:
                        raise

                    # We could not acquire the lock. Try again.
                    if (time.time() - start_time) >= timeout:
                        logger.warn('Could not lock %s in %s seconds' % (
                            self._filename, timeout))
                        if self._fh:
                            self._fh.close()
                        self._fh = open(self._filename, self._fallback_mode)
                        return
                    time.sleep(delay)