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shared_memory.cpython-310.pyc
o }5hH @ s d Z ddgZddlmZ ddlZddlZddlZddlZddlZddl Z ej dkr0ddl Z dZ nddl Z dZ d d lmZ ejejB Zd Ze rId Znd Zdd ZG dd dZdZG dd dZdS )zProvides shared memory for direct access across processes. The API of this package is currently provisional. Refer to the documentation for details. SharedMemory ShareableList )partialNntFT )resource_tracker z/psm_wnsm_c C sB t tt d } | dksJ dtt| }t|t ks J |S )z6Create a random filename for the shared memory object. z_SHM_NAME_PREFIX too long)_SHM_SAFE_NAME_LENGTHlen_SHM_NAME_PREFIXsecrets token_hex)nbytesname r 4/usr/lib/python3.10/multiprocessing/shared_memory.py_make_filename( s r c @ s e Zd ZdZdZdZdZdZej Z dZ e rdndZ ddd Zd d Zd d Zdd Zedd Zedd Zedd Zdd Zdd ZdS )r a Creates a new shared memory block or attaches to an existing shared memory block. Every shared memory block is assigned a unique name. 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. When a shared memory block is no longer needed by any process, the unlink() method should be called to ensure proper cleanup.Ni TFr c C sx |dkst d|rttjB | _|dkrt d|d u r&| jtj@ s&t dtr|d u rL t }z tj || j| j d| _ W n t yF Y q,w || _ n| jrSd| n|}tj || j| j d| _ || _ z |ro|rot| j | t| j }|j}t| j || _W n ty | w t| j d n|r |d u rt n|}ttjtjtj |d ? d @ |d @ |}z1t }|tj kr|d urt t j t!t j |tj W t"| qtjd ||d | _W t"| nt"| w || _ n?|| _ t#tj$d |}zt%|tj$ddd}W t"| nt"| w z t&|}W t'| nt'| w tjd ||d | _|| _(t)| j| _*d S )Nr z!'size' must be a positive integerz4'size' must be a positive number different from zeroz&'name' can only be None if create=TrueT)mode/ shared_memory l r )tagnameF)+ ValueError_O_CREXosO_RDWR_flagsO_EXCL _USE_POSIXr _posixshmemshm_open_mode_fdFileExistsError_name_prepend_leading_slash ftruncatefstatst_sizemmap_mmapOSErrorunlinkr register_winapiCreateFileMappingINVALID_HANDLE_VALUENULLPAGE_READWRITE GetLastErrorERROR_ALREADY_EXISTSerrnoEEXISTstrerror CloseHandleOpenFileMapping FILE_MAP_READ MapViewOfFileVirtualQuerySizeUnmapViewOfFile_size memoryview_buf) selfr createsizestats temp_nameh_maplast_error_codep_bufr r r __init__K s zSharedMemory.__init__c C s$ z| W d S ty Y d S w N)closer. rD r r r __del__ s zSharedMemory.__del__c C s | j | jd| jffS )NF) __class__r rF rO r r r __reduce__ s zSharedMemory.__reduce__c C s | j j d| jd| j dS )N(z, size=))rQ __name__r rF rO r r r __repr__ s zSharedMemory.__repr__c C | j S )z4A memoryview of contents of the shared memory block.)rC rO r r r buf zSharedMemory.bufc C s. | j }tr| jr| j dr| j dd }|S )z4Unique name that identifies the shared memory block.r r N)r' r! r( startswith)rD reported_namer r r r s zSharedMemory.namec C rW )zSize in bytes.)rA rO r r r rF rY zSharedMemory.sizec C s` | j dur | j d| _ | jdur| j d| _tr,| jdkr.t| j d| _dS dS dS )zkCloses access to the shared memory from this instance but does not destroy the shared memory block.Nr r )rC releaser- rN r! r% r rO r r r rN s zSharedMemory.closec C s0 t r| jrt| j t| jd dS dS dS )zRequests that the underlying shared memory block be destroyed. 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 N)r! r' r" shm_unlinkr unregisterrO r r r r/ s zSharedMemory.unlink)NFr )rU __module__ __qualname____doc__r' r% r- rC r r r r$ r! r( rL rP rR rV propertyrX r rF rN r/ r r r r r 2 s* n utf8c @ s e Zd ZdZedededededdj diZ dZ d d d d d d d d dZ e dd Zd6ddddZdd 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.qdzxxxxxxx?z%dsNzxxxxxx?x c C s | S rM r valuer r r <lambda> zShareableList.<lambda>c C s | dtS N )rstripdecode _encodingrg r r r ri s c C s | dS rk )rm rg r r r ri s c C s d S rM r )_valuer r r ri rj )r r r c C s6 t | ttdjfs dS t | trdS t | trdS dS )zUsed 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 rq ) isinstancestrbytesrQ rg r r r _extract_recreation_code s z&ShareableList._extract_recreation_coder c s |d u s|d urq|p d}fdd|D }t |_tdd |D jks(J d}dg_|D ]}||d dkr<jnt|d d 7 }j| q0fd d|D }td j d | j j }t |d |d _nt |_|d urt tjd j jjdjgjR tjd |jjjg fdd|D R tjj jjjg fdd|D R tjj jjjg|R d S t _ttj jjd_d S )Nr c sP g | ]$}t |ttfs jt| n jt| jt| j d f qS )r )rr rs rt _types_mappingtype _alignmentr .0itemrO r r <listcomp>- s z*ShareableList.__init__.<locals>.<listcomp>c s s | ] }t |d kV qdS )rf N)r )r{ fmtr r r <genexpr>6 s z)ShareableList.__init__.<locals>.<genexpr>r r sc s g | ]} |qS r )ru rz rO r r r} ? s rd T)rE rF c 3 s( | ]}t |tr| n|V qd S rM )rr rs encoder{ v_encr r r Z s & c 3 s | ]}| V qd S rM )r r r r r r ` s rf )r _list_lensum_allocated_offsetsry intappendstructcalcsize_format_size_metainfojoin_format_packing_metainfo _format_back_transform_codesr shmro pack_intorX _offset_data_start_offset_packing_formats _offset_back_transform_codeslist unpack_from)rD sequencer _formatsoffsetr~ _recreation_codesrequested_sizer )r rD r rL * s & zShareableList.__init__c C sj |dkr|n|| j }|| j ks| j dk rtdtd| 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.8srf rl ) r IndexErrorr r r rX r rm rn ro )rD positionr r~ fmt_as_strr r r _get_packing_formats s z!ShareableList._get_packing_formatc C sF || j ks | j dk rtdtd| jj| j| d }| j| }|S )z9Gets the back transformation function for a single value.r r b)r r r r r rX r _back_transforms_mapping)rD r transform_codetransform_functionr r r _get_back_transform s z!ShareableList._get_back_transformc C sh || j ks | j dk rtdtd| jj| j|d |t | |}td| 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 rf r N) r r r r r rX r r ro ru r )rD r r rh r r r r !_set_packing_format_and_transform s z/ShareableList._set_packing_format_and_transformc C sr |dkr|n|| j }z| j| j| }t| || jj|\}W n ty- tdw | |}||}|S )Nr zindex out of range) r r r r r r r rX r r )rD r r r back_transformr r r __getitem__ s zShareableList.__getitem__c C s |dkr|n|| j }z| j| }| j| }| |}W n ty' tdw t|ttfs9| jt | }|}n0| j|d | }t|trL| t n|}t ||krXt d|d dkra|}n| jt |f }| ||| t|| jj|| d S )Nr z assignment index out of ranger z(bytes/str item exceeds available storager r )r r r r r rr rs rt rw rx r ro r r r r r r rX ) rD r rh item_offsetr current_format new_format encoded_valueallocated_lengthr r r __setitem__ s: zShareableList.__setitem__c C s t | j| jjddfS )Nrv r )r rQ r r rO r r r rR zShareableList.__reduce__c C s t d| jjdd S )Nrd r )r r r rX rO r r r __len__ r zShareableList.__len__c C s" | j j dt| d| jjdS )NrS z, name=rT )rQ rU r r r rO r r r rV s "zShareableList.__repr__c s d fddt jD S )z=The struct packing format used by all currently stored items.r c 3 s | ]} |V qd S rM )r )r{ irO r r r s z'ShareableList.format.<locals>.<genexpr>)r ranger rO r rO r format s zShareableList.formatc C s d| j d S )z>The struct packing format used for the items' storage offsets.rd r r rO r r r r s z#ShareableList._format_size_metainfoc C d| j S )z>The struct packing format used for the items' packing formats.r r rO r r r r z&ShareableList._format_packing_metainfoc C r )z>The struct packing format used for the items' back transforms.r r rO r r r r r z*ShareableList._format_back_transform_codesc C s | j d d S )Nr rf r rO r r r r s z ShareableList._offset_data_startc C s | j | jd S )Nr )r r rO r r r r z%ShareableList._offset_packing_formatsc C s | j | jd S )Nrf )r r rO r r r r r 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 rM r )r{ entryrg r r r s z&ShareableList.count.<locals>.<genexpr>)r )rD rh r rg r count s zShareableList.countc C s0 t | D ] \}}||kr| S qt|d)zpL.index(value) -> integer -- return first index of value. Raises ValueError if the value is not present.z not in this container) enumerater )rD rh r r r r r index s zShareableList.indexrM )&rU r_ r` ra r floatboolrs rt rQ rw ry r staticmethodru rL r r r r r rR r rV rb r r r r r r r r r classmethodtypes GenericAlias__class_getitem__r r r r r sV I! )ra __all__ functoolsr r, r r8 r r r r r1 r! r" r r O_CREATr r r r r r ro r r r r r <module> s2 F