a
   f8JS0I                   @   s  d dl Z d dlZd dlZddlmZ ddlmZ dZG dd deZG dd	 d	eZ	G d
d deZ
G dd deZG dd deZG dd dejZG dd deZejdkrRG dd dejZG dd dejZG dd dejZG dd deZG dd deZG dd  d eZe e e d!Zejd"krDeed# Zneed$ Zn8G d%d dejZG d&d deZd#e iZeed# Zd'd( Ze Zd)d* Zd+d, Zd-d. ZdS )/    N   )process)	reduction c                   @   s   e Zd ZdS )ProcessErrorN__name__
__module____qualname__r   r   r   -/usr/lib/python3.9/multiprocessing/context.pyr      s   r   c                   @   s   e Zd ZdS )BufferTooShortNr   r   r   r   r   r      s   r   c                   @   s   e Zd ZdS )TimeoutErrorNr   r   r   r   r   r      s   r   c                   @   s   e Zd ZdS )AuthenticationErrorNr   r   r   r   r   r      s   r   c                   @   sX  e Zd ZeZeZeZeZeej	Z	eej
Z
eejZdd Zdd ZdCddZdd	 Zd
d ZdDddZdEddZdFddZdd ZdGddZdHddZdIddZdd ZdJd d!Zd"d# Zd$d% Zdd&d'd(Zdd&d)d*Zd+d, Zd-d. ZdKd/d0Z d1d2 Z!d3d4 Z"d5d6 Z#dLd7d8Z$dMd:d;Z%dNd<d=Z&e'd>d? Z(e(j)d@d? Z(dAdB Z*dS )OBaseContextc                 C   s"   t  }|du rtdn|S dS )z(Returns the number of CPUs in the systemNzcannot determine number of cpus)os	cpu_countNotImplementedError)selfZnumr   r   r   r   )   s    
zBaseContext.cpu_countc                 C   s&   ddl m} ||  d}|  |S )zReturns a manager associated with a running server process

        The managers methods such as `Lock()`, `Condition()` and `Queue()`
        can be used to create shared objects.
        r   )SyncManagerctx)Zmanagersr   get_contextstart)r   r   mr   r   r   Manager1   s    zBaseContext.ManagerTc                 C   s   ddl m} ||S )z1Returns two connection object connected by a piper   )Pipe)
connectionr   )r   Zduplexr   r   r   r   r   <   s    zBaseContext.Pipec                 C   s   ddl m} ||  dS )z#Returns a non-recursive lock objectr   )Lockr   )synchronizer   r   )r   r   r   r   r   r   A   s    zBaseContext.Lockc                 C   s   ddl m} ||  dS )zReturns a recursive lock objectr   )RLockr   )r   r   r   )r   r   r   r   r   r   F   s    zBaseContext.RLockNc                 C   s   ddl m} |||  dS )zReturns a condition objectr   )	Conditionr   )r   r    r   )r   lockr    r   r   r   r    K   s    zBaseContext.Conditionr   c                 C   s   ddl m} |||  dS )zReturns a semaphore objectr   )	Semaphorer   )r   r"   r   )r   valuer"   r   r   r   r"   P   s    zBaseContext.Semaphorec                 C   s   ddl m} |||  dS )z"Returns a bounded semaphore objectr   )BoundedSemaphorer   )r   r$   r   )r   r#   r$   r   r   r   r$   U   s    zBaseContext.BoundedSemaphorec                 C   s   ddl m} ||  dS )zReturns an event objectr   )Eventr   )r   r%   r   )r   r%   r   r   r   r%   Z   s    zBaseContext.Eventc                 C   s    ddl m} |||||  dS )zReturns a barrier objectr   )Barrierr   )r   r&   r   )r   partiesactiontimeoutr&   r   r   r   r&   _   s    zBaseContext.Barrierr   c                 C   s   ddl m} |||  dS )Returns a queue objectr   )Queuer   )queuesr+   r   )r   maxsizer+   r   r   r   r+   d   s    zBaseContext.Queuec                 C   s   ddl m} |||  dS )r*   r   )JoinableQueuer   )r,   r.   r   )r   r-   r.   r   r   r   r.   i   s    zBaseContext.JoinableQueuec                 C   s   ddl m} ||  dS )r*   r   )SimpleQueuer   )r,   r/   r   )r   r/   r   r   r   r/   n   s    zBaseContext.SimpleQueuer   c                 C   s"   ddl m} ||||||  dS )zReturns a process pool objectr   )Pool)context)Zpoolr0   r   )r   Z	processesZinitializerZinitargsZmaxtasksperchildr0   r   r   r   r0   s   s    
zBaseContext.Poolc                 G   s   ddl m} ||g|R  S )zReturns a shared objectr   )RawValue)sharedctypesr2   )r   typecode_or_typeargsr2   r   r   r   r2   z   s    zBaseContext.RawValuec                 C   s   ddl m} |||S )zReturns a shared arrayr   )RawArray)r3   r6   )r   r4   size_or_initializerr6   r   r   r   r6      s    zBaseContext.RawArray)r!   c                G   s(   ddl m} ||g|R ||  dS )z$Returns a synchronized shared objectr   )Valuer!   r   )r3   r8   r   )r   r4   r!   r5   r8   r   r   r   r8      s    zBaseContext.Valuec                C   s    ddl m} |||||  dS )z#Returns a synchronized shared arrayr   )Arrayr9   )r3   r:   r   )r   r4   r7   r!   r:   r   r   r   r:      s    zBaseContext.Arrayc                 C   s,   t jdkr(tt ddr(ddlm} |  dS )zCheck whether this is a fake forked process in a frozen executable.
        If so then run code specified by commandline and exit.
        win32frozenFr   )freeze_supportN)sysplatformgetattrspawnr=   )r   r=   r   r   r   r=      s    zBaseContext.freeze_supportc                 C   s   ddl m} | S )zZReturn package logger -- if it does not already exist then
        it is created.
        r   )
get_logger)utilrB   )r   rB   r   r   r   rB      s    zBaseContext.get_loggerc                 C   s   ddl m} ||S )z8Turn on logging and add a handler which prints to stderrr   )log_to_stderr)rC   rD   )r   levelrD   r   r   r   rD      s    zBaseContext.log_to_stderrc                 C   s   ddl m} dS )zVInstall support for sending connections and sockets
        between processes
        r   )r   N) r   )r   r   r   r   r   allow_connection_pickling   s    z%BaseContext.allow_connection_picklingc                 C   s   ddl m} || dS )zSets the path to a python.exe or pythonw.exe binary used to run
        child processes instead of sys.executable when using the 'spawn'
        start method.  Useful for people embedding Python.
        r   )set_executableN)rA   rH   )r   
executablerH   r   r   r   rH      s    zBaseContext.set_executablec                 C   s   ddl m} || dS )zkSet list of module names to try to load in forkserver process.
        This is really just a hint.
        r   )set_forkserver_preloadN)
forkserverrJ   )r   Zmodule_namesrJ   r   r   r   rJ      s    z"BaseContext.set_forkserver_preloadc                 C   sF   |d u r| S zt | }W n  ty8   td| d Y n0 |  |S )Nzcannot find context for %r)_concrete_contextsKeyError
ValueError_check_available)r   methodr   r   r   r   r      s    zBaseContext.get_contextFc                 C   s   | j S N)_namer   Z
allow_noner   r   r   get_start_method   s    zBaseContext.get_start_methodc                 C   s   t dd S )Nz+cannot set start method of concrete context)rN   r   rP   forcer   r   r   set_start_method   s    zBaseContext.set_start_methodc                 C   s   t  dS )z_Controls how objects will be reduced to a form that can be
        shared with other processes.r   )globalsgetr   r   r   r   reducer   s    zBaseContext.reducerc                 C   s   |t  d< d S )Nr   )rX   )r   r   r   r   r   r[      s    c                 C   s   d S rQ   r   rZ   r   r   r   rO      s    zBaseContext._check_available)T)N)r   )r   )NN)r   )r   )NNr   N)N)N)F)F)+r   r	   r
   r   r   r   r   staticmethodr   Zcurrent_processZparent_processZactive_childrenr   r   r   r   r   r    r"   r$   r%   r&   r+   r.   r/   r0   r2   r6   r8   r:   r=   rB   rD   rG   rH   rJ   r   rT   rW   propertyr[   setterrO   r   r   r   r   r      sR   









  







r   c                   @   s   e Zd ZdZedd ZdS )ProcessNc                 C   s   t  j| S rQ   )_default_contextr   r_   _Popen)process_objr   r   r   ra      s    zProcess._Popenr   r	   r
   Z_start_methodr\   ra   r   r   r   r   r_      s   r_   c                       sF   e Zd ZeZdd Zd fdd	ZdddZdd	d
Zdd Z  Z	S )DefaultContextc                 C   s   || _ d | _d S rQ   )r`   _actual_context)r   r1   r   r   r   __init__   s    zDefaultContext.__init__Nc                    s0   |d u r | j d u r| j| _ | j S t |S d S rQ   )re   r`   superr   )r   rP   	__class__r   r   r      s
    
zDefaultContext.get_contextFc                 C   s<   | j d ur|std|d u r,|r,d | _ d S | || _ d S )Nzcontext has already been set)re   RuntimeErrorr   rU   r   r   r   rW      s    zDefaultContext.set_start_methodc                 C   s"   | j d u r|rd S | j| _ | j jS rQ   )re   r`   rR   rS   r   r   r   rT      s
    
zDefaultContext.get_start_methodc                 C   sB   t jdkrdgS t jdkr"ddgnddg}tjr:|d |S d S )Nr;   rA   darwinforkrK   )r>   r?   r   HAVE_SEND_HANDLEappend)r   methodsr   r   r   get_all_start_methods   s    

z$DefaultContext.get_all_start_methods)N)F)F)
r   r	   r
   r_   rf   r   rW   rT   rp   __classcell__r   r   rh   r   rd      s   

rd   r;   c                   @   s   e Zd ZdZedd ZdS )ForkProcessrl   c                 C   s   ddl m} || S Nr   )Popen)Z
popen_forkrt   rb   rt   r   r   r   ra     s    zForkProcess._PopenNrc   r   r   r   r   rr     s   rr   c                   @   s   e Zd ZdZedd ZdS )SpawnProcessrA   c                 C   s   ddl m} || S rs   )Zpopen_spawn_posixrt   ru   r   r   r   ra     s    SpawnProcess._PopenNrc   r   r   r   r   rv     s   rv   c                   @   s   e Zd ZdZedd ZdS )ForkServerProcessrK   c                 C   s   ddl m} || S rs   )Zpopen_forkserverrt   ru   r   r   r   ra      s    zForkServerProcess._PopenNrc   r   r   r   r   rx     s   rx   c                   @   s   e Zd ZdZeZdS )ForkContextrl   N)r   r	   r
   rR   rr   r_   r   r   r   r   ry   %  s   ry   c                   @   s   e Zd ZdZeZdS SpawnContextrA   Nr   r	   r
   rR   rv   r_   r   r   r   r   r{   )  s   r{   c                   @   s   e Zd ZdZeZdd ZdS )ForkServerContextrK   c                 C   s   t jstdd S )Nz%forkserver start method not available)r   rm   rN   rZ   r   r   r   rO   0  s    z"ForkServerContext._check_availableN)r   r	   r
   rR   rx   r_   rO   r   r   r   r   r}   -  s   r}   )rl   rA   rK   rk   rA   rl   c                   @   s   e Zd ZdZedd ZdS )rv   rA   c                 C   s   ddl m} || S rs   )Zpopen_spawn_win32rt   ru   r   r   r   ra   D  s    rw   Nrc   r   r   r   r   rv   B  s   c                   @   s   e Zd ZdZeZdS rz   r|   r   r   r   r   r{   I  s   c                 C   s   t |  t_d S rQ   )rL   r`   re   )rP   r   r   r   _force_start_methodV  s    r~   c                   C   s   t tdd S )Nspawning_popen)r@   _tlsr   r   r   r   get_spawning_popen_  s    r   c                 C   s
   | t _d S rQ   )r   r   )popenr   r   r   set_spawning_popenb  s    r   c                 C   s    t  d u rtdt| j d S )NzF%s objects should only be shared between processes through inheritance)r   rj   typer   )objr   r   r   assert_spawninge  s    
r   ) r   r>   	threadingrF   r   r   __all__	Exceptionr   r   r   r   objectr   ZBaseProcessr_   rd   r?   rr   rv   rx   ry   r{   r}   rL   r`   r~   localr   r   r   r   r   r   r   r   <module>   sJ    ?,