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proc = subprocess.Popen("sleep 1")
watcher.add_child_handler(proc.pid, callback)
Notes:
Implementations of this class must be thread-safe.
Since child watcher objects may catch the SIGCHLD signal and call
waitpid(-1), there should be only one active object per process.
c t )a Register a new child handler.
Arrange for callback(pid, returncode, *args) to be called when
process 'pid' terminates. Specifying another callback for the same
process replaces the previous handler.
Note: callback() must be thread-safe.
NotImplementedErrorr+ r rU rV s r ry z&AbstractChildWatcher.add_child_handlerV s "###r c t )zRemoves the handler for process 'pid'.
The function returns True if the handler was successfully removed,
False if there was nothing to remove.r r+ r s r remove_child_handlerz)AbstractChildWatcher.remove_child_handlera s "###r c t )zAttach the watcher to an event loop.
If the watcher was previously attached to an event loop, then it is
first detached before attaching to the new loop.
Note: loop may be None.
r r+ r s r attach_loopz AbstractChildWatcher.attach_loopi s "###r c t )zlClose the watcher.
This must be called to make sure that any underlying resource is freed.
r r s r r1 zAbstractChildWatcher.closes s
"###r c t )zReturn ``True`` if the watcher is active and is used by the event loop.
Return True if the watcher is installed and ready to handle process exit
notifications.
r r s r rv z AbstractChildWatcher.is_activez s "###r c t )zdEnter the watcher's context and allow starting new processes
This function must return selfr r s r __enter__z AbstractChildWatcher.__enter__ s "###r c t )zExit the watcher's contextr r+ abcs r __exit__z AbstractChildWatcher.__exit__ s !###r N) r r r r ry r r r1 rv r r r r r r r ? s , $ $ $$ $ $$ $ $$ $ $$ $ $$ $ $ $ $ $ $ $r r c H e Zd ZdZd Zd Zd Zd Zd Zd Z d Z
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This child watcher polls process file descriptors (pidfds) to await child
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.
c " d | _ i | _ d S r r
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r c | S r r r s r r zPidfdChildWatcher.__enter__ r c d S r r )r+ exc_type exc_value
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r r r6 r7 RuntimeWarningvaluesr r! r1 r9 )r+ r pidfd_s r r z PidfdChildWatcher.attach_loop s : !dltl M=
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xZ S ) r ad 'Safe' child watcher implementation.
This implementation avoids disrupting other code spawning processes by
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big number of children (O(n) each time SIGCHLD is raised)
c z | j t d S r )r r9 r( r1 r+ r- s r r1 zSafeChildWatcher.close s,
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and waiting for their termination.
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(O(1) each time a child terminates).
c t t j | _ i | _ d| _ d S r )r( r) threadingLock_lock_zombies_forksr s r r) zFastChildWatcher.__init__e s:
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|||g|R =)NTr@ r r z,unknown process %s exited with returncode %sz8Caught subprocess termination from unknown pid: %d -> %d)r! r r r" r r r r r r r r r` r r rc )r+ r r$ r rU rV s r r z FastChildWatcher._do_waitpid_all s % 1
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This implementation registers a SIGCHLD signal handler on
instantiation (which may conflict with other code that
install own handler for this signal).
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handling a big number of processes (*O(n)* each time a
SIGCHLD is received).
c " i | _ d | _ d S r )r _saved_sighandlerr s r r) z MultiLoopChildWatcher.__init__ s !% r c | j d uS r )r r s r rv z MultiLoopChildWatcher.is_active s %T11r c | j | j d S t j t j }|| j k rt j d n$t j t j | j d | _ d S )Nz+SIGCHLD handler was changed by outside code) r r9 r rI getsignalr r r rc )r+ rd s r r1 zMultiLoopChildWatcher.close s| ! ) F"6>22 dn $ $ NH I I I I M&.$*@ A A A!% r c | S r r r s r r z MultiLoopChildWatcher.__enter__ r r c d S r r r+ r exc_valexc_tbs r r z MultiLoopChildWatcher.__exit__ r r c p t j }|||f| j |< | | d S r )r get_running_loopr r )r+ r rU rV r s r ry z'MultiLoopChildWatcher.add_child_handler s? &(( $h 5
r c : | j |= dS # t $ r Y dS w xY wr r r s r r z*MultiLoopChildWatcher.remove_child_handler r r c | j d S t j t j | j | _ | j %t j d t j | _ t j t j d d S )NzaPrevious SIGCHLD handler was set by non-Python code, restore to default handler on watcher close.F)r rI r r r rc rc rQ r s r r z!MultiLoopChildWatcher.attach_loop sw
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r aA Threaded child watcher implementation.
The watcher uses a thread per process
for waiting for the process finish.
It doesn't require subscription on POSIX signal
but a thread creation is not free.
The watcher has O(1) complexity, its performance doesn't depend
on amount of spawn processes.
c F t j d | _ i | _ d S r ) itertoolsr _pid_counter_threadsr s r r) z ThreadedChildWatcher.__init__N s %OA . .
r c dS rC r r s r rv z ThreadedChildWatcher.is_activeR rn r c d S r r r s r r1 zThreadedChildWatcher.closeU r r c | S r r r s r r z ThreadedChildWatcher.__enter__X r r c d S r r r s r r z ThreadedChildWatcher.__exit__[ r r c d t | j D }|r || j dt | d S d S )Nc : g | ]}| |S r )is_alive).0threads r
z0ThreadedChildWatcher.__del__.._ s6 ) ) )f oo'')6 ) ) )r z0 has registered but not finished child processesr/ )r4 r
r r- r8 )r+ r5 threadss r r6 z ThreadedChildWatcher.__del__^ s} ) )T]-A-A-C-C(D(D ) ) ) ET^UUU!
r c t j }t j | j dt | j ||||fd }|| j |< | d S )Nzasyncio-waitpid-T)targetnamerV daemon) r r r Threadr nextr r
start)r+ r rU rV r r s r ry z&ThreadedChildWatcher.add_child_handlerf sp &((!)9'S$t?P:Q:Q'S'S(,c8T'B)-/ / / $
c r c dS rC r r s r r z)ThreadedChildWatcher.remove_child_handlero s tr c d S r r r s r r z ThreadedChildWatcher.attach_loopu r r c |dk sJ t j |d \ }}t | }| rt j d|| n)# t $ r |}d}t j d| Y nw xY w| rt j d|| n |j |||g|R | j
| d S )Nr r r r r ) r! r r" r r r r rc r r r
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xZ S )_UnixDefaultEventLoopPolicyz:UNIX event loop policy with a watcher for child processes.c V t d | _ d S r )r( r) _watcherr s r r) z$_UnixDefaultEventLoopPolicy.__init__ s$
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7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7s 599c t | | j Bt j t j u r | j | dS dS dS )zSet the event loop.
As a side effect, if a child watcher was set before, then calling
.set_event_loop() from the main thread will call .attach_loop(loop) on
the child watcher.
N)r( set_event_loopr# r current_thread main_threadr )r+ r r- s r r' z*_UnixDefaultEventLoopPolicy.set_event_loop sl t$$$ M %(**i.C.E.EEE M % %d + + + + +
& %EEr c F | j | | j S )z~Get the watcher for child processes.
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)r# r% r s r ru z-_UnixDefaultEventLoopPolicy.get_child_watcher s&
= } r c |t |t sJ | j | j || _ dS )z$Set the watcher for child processes.N)rf r r# r1 )r+ r s r set_child_watcherz-_UnixDefaultEventLoopPolicy.set_child_watcher sD *W6J"K"KK = $ M ! ! !
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