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shared_memory.cpython-39.opt-1.pyc
a DOgG @ s d Z ddgZddlmZ ddlZddlZddlZddlZddlZddl Z ej dkr`ddl Z dZ n ddl Z dZ ejejB Zd Ze rd Znd Zd d 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 z/psm_Zwnsm_c C s" t tt d } tt| }|S )z6Create a random filename for the shared memory object. )_SHM_SAFE_NAME_LENGTHlen_SHM_NAME_PREFIXsecretsZ token_hex)nbytesname r 5/usr/lib64/python3.9/multiprocessing/shared_memory.py_make_filename' s r c @ s e Zd ZdZdZdZdZdZej Z dZ e r.dndZ 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 s |dkst d|r0ttjB | _|dkr0t d|d u rL| jtj@ sLt dtrD|d u rt }ztj || j| j d| _ W n t y Y qZY n0 || _ qqZn.| jrd| n|}tj || j| j d| _ || _ z<|r|rt| j | t| j }|j}t| j || _W n ty& | Y n0 ddlm} || j d n*|r |d u rZt n|}ttjtjtj |d ? d @ |d @ |}zjt }|tj kr|d urt t j t!t j |tj nW t"| qJtjd ||d | _W t"| n t"| 0 || _ qnqJnb|| _ t#tj$d|}z"t%|tj$ddd} W t"| n t"| 0 t&| }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=True)mode/ )register shared_memory l r )ZtagnameF)* ValueError_O_CREXosO_RDWR_flagsO_EXCL _USE_POSIXr _posixshmemZshm_open_mode_fdFileExistsError_name_prepend_leading_slash ftruncatefstatst_sizemmap_mmapOSErrorunlinkresource_trackerr _winapiZCreateFileMappingZINVALID_HANDLE_VALUEZNULLZPAGE_READWRITEZ GetLastErrorZERROR_ALREADY_EXISTSerrnoEEXISTstrerrorZ CloseHandleZOpenFileMappingZ FILE_MAP_READZ MapViewOfFileZVirtualQuerySize_size memoryview_buf) selfr createsizeZstatsr Z temp_nameZh_mapZlast_error_codeZp_bufr r r __init__J s zSharedMemory.__init__c C s$ z | W n ty Y n0 d S N)closer* r4 r r r __del__ s zSharedMemory.__del__c C s | j | jd| jffS )NF) __class__r r6 r: r r r __reduce__ s zSharedMemory.__reduce__c C s | j j d| jd| j dS )N(z, size=))r< __name__r r6 r: r r r __repr__ s zSharedMemory.__repr__c C s | j S )z4A memoryview of contents of the shared memory block.)r3 r: r r r buf s 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)r4 Z reported_namer r r r s zSharedMemory.namec C s | j S )zSize in bytes.)r1 r: r r r r6 s zSharedMemory.sizec C sX | j dur| j d| _ | jdur4| j d| _trT| jdkrTt| j d| _dS )zkCloses access to the shared memory from this instance but does not destroy the shared memory block.Nr r )r3 releaser) r9 r r! r r: r r r r9 s zSharedMemory.closec C s2 t r.| jr.ddlm} t| j || jd 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 ) 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 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 r8 r valuer r r <lambda> zShareableList.<lambda>c C s | dtS N )rstripdecode _encodingrN r r r rP rQ c C s | dS 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 | ttdjfsdS t | tr$dS t | tr2dS dS dS )zUsed in concert with _back_transforms_mapping to convert values into the appropriate Python objects when retrieving them from the list as well as when storing them.Nr r r rX ) isinstancestrbytesr< rN r r r _extract_recreation_code s z&ShareableList._extract_recreation_coder c s |d u s|d ur|pd}fdd|D }t |_d}dg_|D ]6}||d dkr\jnt|d d 7 }j| qDfdd|D }tdj d | j j }t |d |d _ n t |_ |d urt tjdj j jdjgjR tjd |j jjg fd d |D R tjj j jjg fdd |D R tjj j jjg|R n$t _ttjj jd_d S )Nr c sP g | ]H}t |ttfs$ jt| n& jt| jt| j d f qS )r )rY rZ r[ _types_mappingtype _alignmentr .0itemr: r r <listcomp>+ s z*ShareableList.__init__.<locals>.<listcomp>r r sc s g | ]} |qS r )r\ ra r: r r rd = s rK T)r5 r6 c 3 s& | ] }t |tr| n|V qd S r8 )rY rZ encoderb v_encr r <genexpr>X rQ z)ShareableList.__init__.<locals>.<genexpr>c 3 s | ]}| V qd S r8 )rg rh rj r r rl ^ rQ rM )r _list_len_allocated_offsetsr` intappendstructcalcsize_format_size_metainfojoin_format_packing_metainfo _format_back_transform_codesr shmrV pack_intorB _offset_data_start_offset_packing_formats _offset_back_transform_codeslist unpack_from)r4 Zsequencer Z_formatsoffsetfmtZ_recreation_codesZrequested_sizer )rk r4 r r7 ( s & zShareableList.__init__c C sj |dkr |n|| j }|| j ks*| j dk r2tdtd| 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 ) rm IndexErrorrq r} rw rB rz rT rU rV )r4 positionri r fmt_as_strr r r _get_packing_formatq s z!ShareableList._get_packing_formatc C sF || j ks| j dk r tdtd| jj| j| d }| j| }|S )z9Gets the back transformation function for a single value.r r b)rm r rq r} rw 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 tdtd| 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 rM r N) rm r rq rx rw rB rz rg 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^ tdY n0 | |}||}|S )Nr zindex out of range) rm ry rn rq r} r rw rB r r )r4 r r~ ri Zback_transformr r r __getitem__ s zShareableList.__getitem__c C s |dkr |n|| j }z"| j| }| j| }| |}W n tyR tdY n0 t|ttfsv| jt | }|}n`| j|d | }t|tr| t n|}t ||krt d|d dkr|}n| jt |f }| ||| t|| jj|| d S )Nr z assignment index out of ranger z(bytes/str item exceeds available storager re )rm rn ry r r rY rZ r[ r^ r_ rg rV r r r rq rx rw 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| jjddfS )Nr] r )r r< rw r r: r r r r= s zShareableList.__reduce__c C s t d| jjdd S )NrK r )rq r} rw rB r: r r r __len__ s zShareableList.__len__c C s" | j j dt| d| jjdS )Nr> z, name=r? )r< r@ r| rw r r: r r r rA s zShareableList.__repr__c s d fddt jD S )z=The struct packing format used by all currently stored items.rf c 3 s | ]} |V qd S r8 )r )rb ir: r r rl s z'ShareableList.format.<locals>.<genexpr>)rt rangerm 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 rm r: r r r rs 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 ru 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 rv s z*ShareableList._format_back_transform_codesc C s | j d d S )Nr rM r r: r r r ry s z ShareableList._offset_data_startc C s | j | jd S )Nr )ry rn r: r r r rz s z%ShareableList._offset_packing_formatsc C s | j | jd S )NrM )rz rm 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 rl rQ z&ShareableList.count.<locals>.<genexpr>)sum)r4 rO r rN r count s zShareableList.countc C s4 t | D ]\}}||kr| S qt|ddS )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 ro floatboolrZ r[ r< r^ r` r staticmethodr\ r7 r r r r r r= r rA rI r rs ru rv ry rz r{ r r classmethodtypes GenericAlias__class_getitem__r r r r r sT I! )rH __all__ functoolsr r( r r. rq r r r r- r r O_CREATr r r r r r rV r r r r r <module> s. E