U
    adP$                     @   s$  d dl Z d dlZd dlZd dlZddlmZmZ ddlmZ ddlm	Z	 ddlm
Z
 ddd	d
dddgZejdkrzdZdZneeddZej dZere jejdanejadd	 Zdd
 Zdd Zdd Zdd Zd&ddZdd Zdd Zdd Zg Z dd  Z!d!d" Z"d#d$ Z#d%d Z$dS )'    N   )get_start_methodset_start_method)process)	reduction)util_mainfreeze_supportset_executableget_executableget_preparation_dataget_command_lineimport_main_pathwin32Ffrozenzpythonservice.exez
python.exec                 C   s   | a d S N_python_exe)Zexe r   +/usr/lib/python3.8/multiprocessing/spawn.pyr
   )   s    c                   C   s   t S r   r   r   r   r   r   r   -   s    c                 C   s$   t | dkr| d dkrdS dS dS )z=
    Return whether commandline indicates we are forking
       r   --multiprocessing-forkTFN)len)argvr   r   r   
is_forking4   s    r   c                  C   sd   t tjr`i } tjdd D ]0}|d\}}|dkr@d| |< qt|| |< qtf |  t  dS )zE
    Run code for process object if this in not the main process
    r   N=None)r   sysr   splitint
spawn_mainexit)kwdsargnamevaluer   r   r   r	   >   s    


c                  K   sh   t tddr(tjdgdd |  D  S d}|ddd	 |  D ; }t }tg| d
|dg S dS )zJ
    Returns prefix of command line used for spawning a child process
    r   Fr   c                 S   s   g | ]}d | qS )%s=%rr   .0itemr   r   r   
<listcomp>T   s     z$get_command_line.<locals>.<listcomp>z<from multiprocessing.spawn import spawn_main; spawn_main(%s)z, c                 s   s   | ]}d | V  qdS )r&   Nr   r'   r   r   r   	<genexpr>W   s     z#get_command_line.<locals>.<genexpr>z-cN)getattrr   
executableitemsjoinr   Z_args_from_interpreter_flagsr   )r"   progZoptsr   r   r   r   N   s    c                 C   s   t tjstdtjdkrrddl}ddl}|dk	rL||j|j	B d|}nd}t
j| |d}||tj}|}n"ddlm}	 ||	j_| }t| }t||}
t|
 dS )	z7
    Run code specified by data received over pipe
    zNot forkingr   r   NF)source_processr   )resource_tracker)r   r   r   AssertionErrorplatformmsvcrt_winapiZOpenProcessZSYNCHRONIZEZPROCESS_DUP_HANDLEr   Z	duplicateZopen_osfhandleosO_RDONLY r2   Z_resource_trackerZ_fddupr   r!   )Zpipe_handleZ
parent_pidZ
tracker_fdr5   r6   r1   Z
new_handlefdparent_sentinelr2   Zexitcoder   r   r   r    \   s,    

 

r    c              	   C   s`   t j| ddd@}dt _z$tj|}t| tj|}W 5 t `X W 5 Q R X |	|S )NrbT)closefd)
r7   fdopenr   current_process_inheritingr   pickleloadprepare
_bootstrap)r;   r<   Zfrom_parentZpreparation_dataselfr   r   r   r   x   s    
c                   C   s   t t ddrtdd S )NrA   Fa  
        An attempt has been made to start a new process before the
        current process has finished its bootstrapping phase.

        This probably means that you are not using fork to start your
        child processes and you have forgotten to use the proper idiom
        in the main module:

            if __name__ == '__main__':
                freeze_support()
                ...

        The "freeze_support()" line can be omitted if the program
        is not going to be frozen to produce an executable.)r,   r   r@   RuntimeErrorr   r   r   r   _check_not_importing_main   s    rH   c                 C   s  t   ttjt jd}tjdk	r2tj |d< t	j
 }z|d}W n tk
r^   Y nX tj||< |j| |t	jtjt t d t	jd }t|jdd}|dk	r||d< nft	jd	kststst|d
d}|dk	rtj
|s
tjdk	r
tj
tj|}tj
||d< |S )zM
    Return info about parent needed by child to unpickle process object
    )log_to_stderrauthkeyN	log_levelr9   )r$   sys_pathsys_argvorig_dirdirstart_method__main__r$   init_main_from_namer   __file__init_main_from_path)rH   dictr   Z_log_to_stderrr   r@   rJ   Z_loggerZgetEffectiveLevelr   pathcopyindex
ValueErrorORIGINAL_DIRupdater   r7   getcwdr   modulesr,   __spec__r4   WINEXE
WINSERVICEisabsr/   normpath)r$   drL   imain_moduleZmain_mod_name	main_pathr   r   r   r      sD    





c                 C   s   d| kr| d t  _d| kr,| d t  _d| krD| d rDt  d| kr^t | d  d| krp| d t_	d| kr| d t_
d| krt| d  d| kr| d t _d	| krt| d	 d
d d| krt| d  nd| krt| d  dS )zE
    Try to get current process ready to unpickle process object
    r$   rJ   rI   rK   rL   rM   rO   rN   rP   T)ZforcerR   rT   N)r   r@   r$   rJ   r   rI   Z
get_loggerZsetLevelr   rV   r   r7   chdirrZ   r   _fixup_main_from_name_fixup_main_from_path)datar   r   r   rD      s,    


rD   c                 C   s~   t jd }| dks| dr d S t|jdd | kr6d S t| td}t	j
| ddd}|j| | t jd< t jd< d S )NrQ   z	.__main__r$   __mp_main__T)run_nameZ	alter_sys)r   r]   endswithr,   r^   old_main_modulesappendtypes
ModuleTyperunpyZ
run_module__dict__r[   )Zmod_namecurrent_mainre   main_contentr   r   r   rh      s    


rh   c                 C   s   t jd }tjtj| d }|dkr.d S t|dd | krBd S t| t	
d}tj| dd}|j| | t jd< t jd< d S )NrQ   r   ZipythonrS   rk   )rl   )r   r]   r7   rV   splitextbasenamer,   rn   ro   rp   rq   rr   Zrun_pathrs   r[   )rf   rt   Z	main_namere   ru   r   r   r   ri   	  s    


ri   c                 C   s   t |  dS )z<
    Set sys.modules['__main__'] to module at main_path
    N)ri   )rf   r   r   r   r   %  s    )NN)%r7   r   rr   rp   r9   r   r   r   contextr   r   __all__r4   r_   r`   r,   r-   lowerrm   rV   r/   exec_prefixr   r
   r   r   r	   r   r    r   rH   r   rn   rD   rh   ri   r   r   r   r   r   <module>   sD     


2&