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:param flags: additional flags to be given to os.open in case a file handle is initially opened
for mapping. Has no effect if a region can actually be reused.
:return: this instance - it should be queried for whether it points to a valid memory region.
This is not the case if the mapping failed because we reached the end of the file
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either the file has reached its end, or the map was created between two existing regionsTNF)r r � file_size�min�window_sizer �includes_ofsr* �_obtain_regionr3 �_br �ofs_endr )r �offset�size�flags�need_region�man�fsizes r �
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��r c �V � | j �| j � d� � d| _ dS )a/ Unuse the current region. Does nothing if we have no current region
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to un-use the region once you are done reading from it in persistent cursors as it
helps to free up resource more quicklyN���)r r3 r s r r* zWindowCursor.unuse_region� s- � � �<�#��L�/�/��3�3�3�����r c � � t | j � � � � � | j | j | j z � S )a� Return a buffer object which allows access to our memory region from our offset
to the window size. Please note that it might be smaller than you requested when calling use_region()
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prevent resources from being freed even though they might not be accounted for anymore !)�
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:return: the underlying raw memory map. Please not that the offset and size is likely to be different
to what you set as offset and size. Use it only if you are sure about the region it maps, which is the whole
file in case of StaticWindowMapManager)r �mapr s r rQ zWindowCursor.map� s � �
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is_associatedzWindowCursor.is_associated� s � ��{�$�&�&r c �* � | j j | j z S )zh:return: offset to the first byte pointed to by our cursor
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� ��z�r c � � | j S )z�:return: our mapped region, or None if nothing is mapped yet
:raise AssertionError: if we have no current region. This is only useful for debuggingrS r s r r5 zWindowCursor.region� s � � �|�r c �z � | j j | j z |cxk o| j j | j z | j z k nc S )z�:return: True if the given absolute offset is contained in the cursors
current region
**Note:** cursor must be valid for this to workrZ )r �ofss r r@ zWindowCursor.includes_ofs� sE � � ���$�)�+��`�`�`�`�t�|����7R�UY�U_�7_�`�`�`�`�`r c �4 � | j � � � S )z$:return: size of the underlying file)r r= r s r r= zWindowCursor.file_size� s � ��{�$�$�&�&�&r c �4 � | j � � � S )z>:return: path or file descriptor of the underlying mapped file)r r. r s r r. zWindowCursor.path_or_fd� s � ��{�%�%�'�'�'r c � � t | j � � � t � � rt d� � �| j � � � S )ze:return: path of the underlying mapped file
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ValueErrorr s r �pathzWindowCursor.path� sH � � �d�k�,�,�.�.��4�4� _��]�^�^�^��{�%�%�'�'�'r c � � t | j � � � t � � rt d� � �| j � � � S )z�:return: file descriptor used to create the underlying mapping.
**Note:** it is not required to be valid anymore
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