class MutexLockError(Exception):
    """Exception when mutex lock fails
    """
    pass


class MutexUnlockError(Exception):
    """Exception when mutex unlock fails
    """
    pass


class BlockTimeExceedError(Exception):
    """Exception when acquiring mutex lock exceed the allwed block time
    """
    pass

class MutexLockError(Exception):
    """Exception when mutex lock fails
    """
    pass


class MutexUnlockError(Exception):
    """Exception when mutex unlock fails
    """
    pass


class BlockTimeExceedError(Exception):
    """Exception when acquiring mutex lock exceed the allwed block time
    """
    pass

Exception when mutex lock fails Exception when mutex unlock fails Exception when acquiring mutex lock exceed the allwed block time