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This function must return selfr( r� r r r � __enter__p s z AbstractChildWatcher.__enter__c C r' )zExit the watcher's contextr( �r% �a�b�cr r r �__exit__v s z AbstractChildWatcher.__exit__N) r� r� r� r� rg r, r. r, rd r/ r4 r r r r r , s
r c @ sX e Zd ZdZdd� Zdd� Zdd� Zdd � Zd
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dd� Z dd� Z dS )r a6 Child watcher implementation using Linux's pid file descriptors.
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process termination. In some respects, PidfdChildWatcher is a "Goldilocks"
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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is_runningr� r r r rd � � zPidfdChildWatcher.is_activec C r r �r. r� r r r r, � r zPidfdChildWatcher.closec C sd | j d ur|d u r| jrt�dt� | j�� D ]\}}}| j �|� t�|� q| j� � || _ d S �NzCA loop is being detached from a child watcher with pending handlers)
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d� Z dS )�BaseChildWatcherc C r5 r r6 r� r r r r# � r8 zBaseChildWatcher.__init__c C r r rA r� r r r r, � r zBaseChildWatcher.closec C r> r r? r� r r r rd � r@ zBaseChildWatcher.is_activec C r' r r( )r% � expected_pidr r r � _do_waitpid� r� z BaseChildWatcher._do_waitpidc C r' r r( r� r r r �_do_waitpid_all� r� z BaseChildWatcher._do_waitpid_allc C sj | j d ur|d u r| jrt�dt� | j d ur | j �tj� || _ |d ur3|�tj| j � | �
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�z BaseChildWatcher.attach_loopc
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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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� �zFastChildWatcher.__exit__c G s| | j �( z| j�|�}W n ty# ||f| j|< Y W d � d S w W d � n1 s.w Y |||g|�R � d S r )r^ r_ rI rP r7 )r% rw rJ rK rx r r r rg q s �� � z"FastChildWatcher.add_child_handlerc C rS rT rU r+ r r r r, rV z%FastChildWatcher.remove_child_handlerc C s z t �dt j�\}}W n
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instantiation (which may conflict with other code that
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handling a big number of processes (*O(n)* each time a
SIGCHLD is received).
c C s i | _ d | _d S r )r7 �_saved_sighandlerr� r r r r# � r8 z MultiLoopChildWatcher.__init__c C s
| j d uS r )ra r� r r r rd � r� z MultiLoopChildWatcher.is_activec C sT | j �� | jd u r d S t�tj�}|| jkr t�d� nt�tj| j� d | _d S )Nz+SIGCHLD handler was changed by outside code) r7 r4 ra r@ � getsignalrP rQ r
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dd� Zdd� Zdd� ZdS )r aA Threaded child watcher implementation.
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but a thread creation is not free.
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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 r. i r z ThreadedChildWatcher.attach_loopc C s� 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
z$_UnixDefaultEventLoopPolicy.__init__c C s~ t j�2 | jd u r%t� | _t�� t�� u r-| j�| jj � W d � d S W d � d S W d � d S 1 s8w Y d S r )
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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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the child watcher.
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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 s | j dur
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