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t � �dS )z�Return ``True`` if the watcher is active and is used by the event loop.
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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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� Z S )r ad 'Safe' child watcher implementation.
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big number of children (O(n) each time SIGCHLD is raised)
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and waiting for their termination.
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(O(1) each time a child terminates).
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�"�z FastChildWatcher._do_waitpid_all) r� r� r� r� r r' r, r1 rc r) rN r� r r r# r r L s r c @ sh e Zd ZdZdd� Zdd� Zdd� Zdd � Zd
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dd� ZdS )r a~ A watcher that doesn't require running loop in the main thread.
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SIGCHLD is received).
c C s i | _ d | _d S r )r3 �_saved_sighandlerr� r r r r � s z MultiLoopChildWatcher.__init__c C s
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r )r! r r r r r rP ) s z MultiLoopChildWatcher._sig_chldN)r� r� r� r� r r` r' r, r1 rc r) r+ rN rM rP 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 ? s z ThreadedChildWatcher.__init__c C s dS r r r� r r r r` C s z ThreadedChildWatcher.is_activec C s | � � d S r )�
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z&ThreadedChildWatcher.add_child_handlerc C s dS r r r( r r r r) g s z)ThreadedChildWatcher.remove_child_handlerc C s d S r r r* r r r r+ m s z ThreadedChildWatcher.attach_loopc C s� |dks J �zt �|d�\}}W n& tyF |}d}t�d|� Y n 0 t|�}|�� rft�d||� |�� r~t�d||� n|j |||g|�R � | j
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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
z$_UnixDefaultEventLoopPolicy.__init__c C s\ t j�B | jd u r:t� | _t�� t�� u r:| j�| jj � W d � n1 sN0 Y d S r )
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z)_UnixDefaultEventLoopPolicy._init_watcherc s6 t � �|� | jdur2t�� t�� u r2| j�|� dS )z�Set the event loop.
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�z*_UnixDefaultEventLoopPolicy.set_event_loopc C s | j du r| �� | j S )z~Get the watcher for child processes.
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z-_UnixDefaultEventLoopPolicy.get_child_watcherc C s4 |du st |t�sJ �| jdur*| j�� || _dS )z$Set the watcher for child processes.N)rS r rw r' )r! ro r r r �set_child_watcher� s
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