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The solution is safe but it has a significant overhead when handling a big number of processes (*O(n)* each time a SIGCHLD is received). cCsi|_d|_dSr)rd_saved_sighandlerrrrrr$rezMultiLoopChildWatcher.__init__cCs |jduSr)rrrrrrmr zMultiLoopChildWatcher.is_activecCsT|j|jdur dSttj}||jkrtdnttj|jd|_dS)Nz+SIGCHLD handler was changed by outside code) rdr5rrD getsignalrrr r;)r&r]rrrr-s      zMultiLoopChildWatcher.closecCrfrrrrrrr\rDzMultiLoopChildWatcher.__enter__cCrgrrr&rhexc_valexc_tbrrrrarDzMultiLoopChildWatcher.__exit__cGs&t}|||f|j|<||dSr)rget_running_looprdr~)r&rrPrQrrrrrpsz'MultiLoopChildWatcher.add_child_handlercCrrrrXrrrrYrz*MultiLoopChildWatcher.remove_child_handlercCsN|jdurdSttj|j|_|jdurtdtj|_ttjddS)NzaPrevious SIGCHLD handler was set by non-Python code, restore to default handler on watcher close.F)rrDrrr r;r\rLrZrrrr[s   z!MultiLoopChildWatcher.attach_loopcCrrrrXrrrrs z%MultiLoopChildWatcher._do_waitpid_allc Cs|dksJz t|tj\}}Wnty&|}d}td|d}Yn w|dkr-dSt|}d}z |j|\}}}Wnt yPtjd|ddYdSw| r^td||dS|rk| rkt d |||j |||g|RdS) NrrxrFTrr%Loop %r that handles pid %r is closedr)rrzrr{r r;rrdryrY is_closedrrr) r&r}rr!r debug_logrrPrQrrrr~s<      z!MultiLoopChildWatcher._do_waitpidc CsDz|WdSttfyty!tjdddYdSw)NrTr)rrsrtrur r;)r&rrrrrr%s zMultiLoopChildWatcher._sig_chldN)rrrrr$rmr-r\rarprYr[rr~rrrrrrs  %rc@sneZdZdZddZddZddZdd Zd d Zd d Z e j fddZ ddZ ddZddZddZdS)raAThreaded child watcher implementation. 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The watcher has O(1) complexity, its performance doesn't depend on amount of spawn processes. cCstd|_i|_dSr) itertoolsr _pid_counter_threadsrrrrr$;r*zThreadedChildWatcher.__init__cCrr"rrrrrrm?rDzThreadedChildWatcher.is_activecCs |dSr) _join_threadsrrrrr-Bs zThreadedChildWatcher.closecCs.ddt|jD}|D]}|qdS)z%Internal: Join all non-daemon threadscSsg|] }|r|js|qSr)is_alivedaemon.0threadrrr Gs  z6ThreadedChildWatcher._join_threads..N)r0rrrr)r&threadsrrrrrEs z"ThreadedChildWatcher._join_threadscCrfrrrrrrr\LrDzThreadedChildWatcher.__enter__cCrgrrrrrrraOrDzThreadedChildWatcher.__exit__cCs:ddt|jD}|r||jdt|ddSdS)NcSsg|]}|r|qSr)rrrrrrSs z0ThreadedChildWatcher.__del__..z0 has registered but not finished child processesr+)r0rrrr)r4)r&rrrrrrRs  zThreadedChildWatcher.__del__cGsFt}tj|jdt|j||||fdd}||j|<|dS)Nzwaitpid-T)targetnamerQr) rrrThreadr~nextrrstart)r&rrPrQrrrrrrpZs   z&ThreadedChildWatcher.add_child_handlercCrr"rrXrrrrYcsz)ThreadedChildWatcher.remove_child_handlercCrgrrrZrrrr[irDz ThreadedChildWatcher.attach_loopcCs|dksJz t|d\}}Wnty#|}d}td|Ynwt|}|r3td|||r?td||n |j |||g|R|j |dS)Nrrxrrr) rrzr{r r;rrrrrrry)r&rr}rPrQrr!rrrrr~ls(   z ThreadedChildWatcher._do_waitpidN)rrrrr$rmr-rr\rar2r3rrprYr[r~rrrrr.s   rcsHeZdZdZeZfddZddZfddZdd Z d d Z Z S) _UnixDefaultEventLoopPolicyz:UNIX event loop policy with a watcher for child processes.cstd|_dSr)r#r$_watcherrr(rrr$s  z$_UnixDefaultEventLoopPolicy.__init__cCs~tj2|jdur%t|_ttur-|j|jj WddSWddSWddS1s8wYdSr) rrrrrcurrent_thread main_threadr[_localrrrrr _init_watchers "z)_UnixDefaultEventLoopPolicy._init_watchercs>t||jdurttur|j|dSdSdS)zSet the event loop. As a side effect, if a child watcher was set before, then calling .set_event_loop() from the main thread will call .attach_loop(loop) on the child watcher. N)r#set_event_looprrrrr[rZr(rrrs  z*_UnixDefaultEventLoopPolicy.set_event_loopcCs|jdur ||jS)z~Get the watcher for child processes. If not yet set, a ThreadedChildWatcher object is automatically created. N)rrrrrrrls z-_UnixDefaultEventLoopPolicy.get_child_watchercCs4|dus t|ts J|jdur|j||_dS)z$Set the watcher for child processes.N)r^rrr-)r&r}rrrset_child_watchers   z-_UnixDefaultEventLoopPolicy.set_child_watcher) rrrrr" _loop_factoryr$rrrlrrrrr(rrs   r)3rrNrrrrrDrrrLr.rr2rrrrrrr r r r logr __all__r- ImportErrorrrBaseSelectorEventLoopr" ReadTransportrb_FlowControlMixinWriteTransportrjBaseSubprocessTransportrorrr|rrrrBaseDefaultEventLoopPolicyrrrrrrrsd               NON5Ji}Y2