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child watcher implementation. It doesn't require signals or threads, doesn't
interfere with any processes launched outside the event loop, and scales
linearly with the number of subprocesses launched by the event loop. The
main disadvantage is that pidfds are specific to Linux, and only work on
recent (5.3+) kernels.
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handling a big number of processes (*O(n)* each time a
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c C s i | _ d | _d S r )r9 �_saved_sighandlerr� r r r r# � r: z MultiLoopChildWatcher.__init__c C s
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r )r% r r r r r rS % s �z MultiLoopChildWatcher._sig_chldN)r� r� r� r� r# rd r, r1 r6 rg r. r0 rQ rP rS r r r r r � s %r c @ sn e Zd ZdZdd� Zdd� Zdd� Zdd � Zd
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dd� Zdd� Zdd� ZdS )r aA Threaded child watcher implementation.
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on amount of spawn processes.
c C s t �d�| _i | _d S r� )� itertoolsr� � _pid_counter�_threadsr� r r r r# ; r) z ThreadedChildWatcher.__init__c C r r r r� r r r rd ? r z ThreadedChildWatcher.is_activec C s | � � d S r )�
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z&ThreadedChildWatcher.add_child_handlerc C r r r r- r r r r. c s z)ThreadedChildWatcher.remove_child_handlerc C r< r r r/ r r r r0 i r z ThreadedChildWatcher.attach_loopc C s� |dksJ �z
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� Z S ) �_UnixDefaultEventLoopPolicyz:UNIX event loop policy with a watcher for child processes.c s t � �� d | _d S r )r" r# �_watcherr� r' r r r# � s
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��"�z)_UnixDefaultEventLoopPolicy._init_watcherc s> t � �|� | jdurt�� t�� u r | j�|� dS dS dS )z�Set the event loop.
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�z*_UnixDefaultEventLoopPolicy.set_event_loopc C s | j du r | �� | j S )z~Get the watcher for child processes.
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z-_UnixDefaultEventLoopPolicy.get_child_watcherc C s4 |du s t |t�s J �| jdur| j�� || _dS )z$Set the watcher for child processes.N)rU r ry r, )r% rr r r r �set_child_watcher� s
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