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Edit: shared_memory.cpython-39.pyc
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This enables one process to create a shared memory block with a particular name so that a different process can attach to that same shared memory block using that same name. As a resource for sharing data across processes, shared memory blocks may outlive the original process that created them. When one process no longer needs access to a shared memory block that might still be needed by other processes, the close() method should be called. 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In order to ensure proper cleanup of resources, unlink should be called once (and only once) across all processes which have access to the shared memory block.r )� unregisterr N)r r# r, rE r Z shm_unlink)r4 rE r r r r+ � s zSharedMemory.unlink)NFr )r@ � __module__� __qualname__�__doc__r# r! r) r3 r r r r r r$ r7 r; r= rA �propertyrB r r6 r9 r+ r r r r r 1 s( l �utf8c @ s e Zd ZdZedededededdj diZ dZ d d � d d � d d � d d � d�Z e dd� �Zd6dd�dd�Zdd� Zdd� Zdd� Zdd� Zd d � Zd d � Zd d!� Zd"d#� Zed$d%� �Zed&d'� �Zed(d)� �Zed*d+� �Z ed,d-� �Z ed.d/� �Z ed0d1� �Z d2d3� Z d4d5� Z!e"e#j$�Z%dS )7r a� Pattern for a mutable list-like object shareable via a shared memory block. It differs from the built-in list type in that these lists can not change their overall length (i.e. no append, insert, etc.) Because values are packed into a memoryview as bytes, the struct packing format for any storable value must require no more than 8 characters to describe its format.�q�dzxxxxxxx?z%dsNzxxxxxx?x� c C s | S r8 r ��valuer r r �<lambda> � zShareableList.<lambda>c C s | � d��t�S �N� )�rstrip�decode� _encodingrN r r r rP rQ c C s | � d�S rR )rT rN r r r rP rQ c C s d S r8 r )�_valuer r r rP rQ )r r r � c C s: t | ttdjf�sdS t | t�r$dS t | t�r2dS dS dS )z�Used in concert with _back_transforms_mapping to convert values into the appropriate Python objects when retrieving them from the list as well as when storing them.Nr r r rX )� isinstance�str�bytesr< rN r r r �_extract_recreation_code s z&ShareableList._extract_recreation_code�r c s� |d u s|d ur�|pd}�fdd�|D �}t |��_tdd� |D ���jksPJ �d}dg�_|D ]6}||d dkrx�jnt|d d� �7 }�j�|� q`�fd d�|D �}t�d �j d � |� �j �j �}t |d |d ��_n t |��_|d u�r�t� tjd �j �jjd�jg�j�R � tjd � |��jj�jg� fdd�|D ��R � tj�j �jj�jg� fdd�|D ��R � tj�j �jj�jg|�R � n$t ���_tt��j �jjd���_d S )Nr c sP g | ]H}t |ttf�s$� jt|� n&� jt|� � jt|�� j d f �qS )r )rY rZ r[ �_types_mapping�type� _alignmentr ��.0�itemr: r r � <listcomp>+ s � � �z*ShareableList.__init__.<locals>.<listcomp>c s s | ]}t |�d kV qdS )rM N)r )rb �fmtr r r � <genexpr>4 rQ z)ShareableList.__init__.<locals>.<genexpr>r r �sc s g | ]}� � |��qS r )r\ ra r: r r rd = s rK � T)r5 r6 c 3 s& | ] }t |t�r|�� �n|V qd S r8 )rY rZ �encode�rb �v��_encr r rf X rQ c 3 s | ]}|� � �V qd S r8 )ri rj rl r r rf ^ rQ rM )r � _list_len�sum�_allocated_offsetsr` �int�append�struct�calcsize�_format_size_metainfo�join�_format_packing_metainfo� _format_back_transform_codesr �shmrV � pack_intorB �_offset_data_start�_offset_packing_formats� _offset_back_transform_codes�list� unpack_from)r4 Zsequencer Z_formats�offsetre Z_recreation_codesZrequested_sizer )rm r4 r r7 ( s� � & ����� �������� ��zShareableList.__init__c C sj |dkr |n|| j }|| j ks*| j dk r2td��t�d| jj| j|d �d }|�d�}|�t �}|S )z>Gets the packing format for a single value stored in the list.r � Requested position out of range.�8srM rS ) rn � IndexErrorrs r ry rB r| rT rU rV )r4 �positionrk re � fmt_as_strr r r �_get_packing_formatq s �� z!ShareableList._get_packing_formatc C sF || j ks| j dk r td��t�d| jj| j| �d }| j| }|S )z9Gets the back transformation function for a single value.r r� �b)rn r� rs r ry rB r} �_back_transforms_mapping)r4 r� �transform_codeZtransform_functionr r r �_get_back_transform� s �� z!ShareableList._get_back_transformc C sh || j ks| j dk r td��t�d| jj| j|d |�t�� | � |�}t�d| jj| j | |� dS )zvSets the packing format and back transformation code for a single value in the list at the specified position.r r� r� rM r� N) rn r� rs rz ry rB r| ri rV r\ r} )r4 r� r� rO r� r r r �!_set_packing_format_and_transform� s � �z/ShareableList._set_packing_format_and_transformc C sv |dkr |n|| j }z.| j| j| }t�| �|�| jj|�\}W n ty^ td��Y n0 | � |�}||�}|S )Nr zindex out of range) rn r{ rp rs r r� ry rB r� r� )r4 r� r� rk Zback_transformr r r � __getitem__� s � zShareableList.__getitem__c C s� |dkr |n|| j }z"| j| }| j| }| �|�}W n tyR td��Y n0 t|ttf�sv| jt |� }|}n`| j|d | }t|t�r�|� t �n|}t |�|kr�t d��|d dkr�|}n| jt |f }| �|||� t�|| jj||� d S )Nr z assignment index out of ranger z(bytes/str item exceeds available storager rg )rn rp r{ r� r� rY rZ r[ r^ r_ ri rV r r r� rs rz ry rB ) r4 r� rO Z item_offsetr� Zcurrent_formatZ new_formatZ encoded_valueZallocated_lengthr r r � __setitem__� s8 � � ��zShareableList.__setitem__c C s t | j| jjd�dfS )Nr] r )r r< ry r r: r r r r= � s zShareableList.__reduce__c C s t �d| jjd�d S )NrK r )rs r ry rB r: r r r �__len__� s zShareableList.__len__c C s" | j j� dt| �� d| jj�d�S )Nr> z, name=r? )r< r@ r~ ry r r: r r r rA � s zShareableList.__repr__c s d� � fdd�t� j�D ��S )z=The struct packing format used by all currently stored items.rh c 3 s | ]}� � |�V qd S r8 )r� )rb �ir: r r rf � s z'ShareableList.format.<locals>.<genexpr>)rv �rangern r: r r: r �format� s �zShareableList.formatc C s d| j d S )z>The struct packing format used for the items' storage offsets.rK r �rn r: r r r ru � s z#ShareableList._format_size_metainfoc C s d| j S )z>The struct packing format used for the items' packing formats.r� r� r: r r r rw � s z&ShareableList._format_packing_metainfoc C s d| j S )z>The struct packing format used for the items' back transforms.r� r� r: r r r rx � s z*ShareableList._format_back_transform_codesc C s | j d d S )Nr rM r� r: r r r r{ � s z ShareableList._offset_data_startc C s | j | jd S )Nr )r{ rp r: r r r r| � s z%ShareableList._offset_packing_formatsc C s | j | jd S )NrM )r| rn r: r r r r} s z*ShareableList._offset_back_transform_codesc s t � fdd�| D ��S )zCL.count(value) -> integer -- return number of occurrences of value.c 3 s | ]}� |kV qd S r8 r )rb �entryrN r r rf rQ z&ShareableList.count.<locals>.<genexpr>)ro )r4 rO r rN r �count s zShareableList.countc C s4 t | �D ]\}}||kr| S qt|�d���dS )zpL.index(value) -> integer -- return first index of value. Raises ValueError if the value is not present.z not in this containerN)� enumerater )r4 rO r� r� r r r �index s zShareableList.index)N)&r@ rF rG rH rq �float�boolrZ r[ r< r^ r` r� � staticmethodr\ r7 r� r� r� r� r� r= r� rA rI r� ru rw rx r{ r| r} r� r� � classmethod�types� GenericAlias�__class_getitem__r r r r r � sT �� I! )rH �__all__� functoolsr r( r r. rs r r� r r- r r �O_CREATr r r r r r rV r r r r r �<module> s. E