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This implementation avoids disrupting other code spawning processes by polling explicitly each process in the SIGCHLD handler instead of calling os.waitpid(-1). This is a safe solution but it has a significant overhead when handling a big number of children (O(n) each time SIGCHLD is raised) cs|j ¡tƒ ¡dSr)r1r/rr'rêr#rrr' s zSafeChildWatcher.closecCs|Srrrêrrrr*szSafeChildWatcher.__enter__cCsdSrrr+rrrr/szSafeChildWatcher.__exit__cGs||f|j|<| |¡dSr)r1rKr%rrrrcsz"SafeChildWatcher.add_child_handlercCs(z|j|=WdSty"YdS0dS©NTF©r1rNr&rrrr's z%SafeChildWatcher.remove_child_handlercCst|jƒD]}| |¡q dSr©r*r1rKr&rrrrL$sz SafeChildWatcher._do_waitpid_allcCsÂzt |tj¡\}}Wn&ty<|}d}t d|¡Yn.0|dkrJdSt|ƒ}|j ¡rjt d||¡z|j |¡\}}Wn,tyª|j ¡r¦tjd|ddYn0|||g|¢RŽdS)Nr?ú8Unknown child process pid %d, will report returncode 255rú$process %s exited with returncode %sú'Child watcher got an unexpected pid: %rTrû) r|rAÚWNOHANGrBr rrCrÁrærér1r@rN)r!rJrsrDrtrHrIrrrrK)s0þ ÿ ÿzSafeChildWatcher._do_waitpid)r»r¼r½r¾r'r*r/rcr'rLrKr¿rrr#rrs rcsTeZdZdZ‡fdd„Z‡fdd„Zdd„Zdd „Zd d„Zdd „Z dd„Z ‡ZS)raW'Fast' child watcher implementation. This implementation reaps every terminated processes by calling os.waitpid(-1) directly, possibly breaking other code spawning processes and waiting for their termination. There is no noticeable overhead when handling a big number of children (O(1) each time a child terminates). cs$tƒ ¡t ¡|_i|_d|_dSrµ)rrÚ threadingÚLockÚ_lockÚ_zombiesÚ_forksrêr#rrrVs zFastChildWatcher.__init__cs"|j ¡|j ¡tƒ ¡dSr)r1r/rZrr'rêr#rrr'\s zFastChildWatcher.closecCs<|j"|jd7_|WdƒS1s.0YdS)Nr)rYr[rêrrrr*aszFastChildWatcher.__enter__cCst|jN|jd8_|js"|js2WdƒdSt|jƒ}|j ¡Wdƒn1sZ0Yt d|¡dS)Nrz5Caught subprocesses termination from unknown pids: %s)rYr[rZrBr/r r)r!r,r-r.Zcollateral_victimsrrrr/gs (þzFastChildWatcher.__exit__c Gs||jPz|j |¡}Wn.tyF||f|j|<YWdƒdS0Wdƒn1s\0Y|||g|¢RŽdSr)rYrZr@rNr1)r!rsrHrIrtrrrrcus2z"FastChildWatcher.add_child_handlercCs(z|j|=WdSty"YdS0dSrPrQr&rrrr'ƒs z%FastChildWatcher.remove_child_handlerc Cszt dtj¡\}}Wnty*YdS0|dkr8dSt|ƒ}|jŒz|j |¡\}}WnNtyª|j r¢||j |<|j ¡r’t d||¡YWdƒqd}Yn0|j ¡rÄt d||¡Wdƒn1sØ0Y|durút d||¡q|||g|¢RŽqdS)Nr5rz,unknown process %s exited with returncode %srTz8Caught subprocess termination from unknown pid: %d -> %d)r|rArVrBrCrYr1r@rNr[rZrÁrær rér)r!rsrDrtrHrIrrrrLŠs: þ ÿ"þz FastChildWatcher._do_waitpid_all)r»r¼r½r¾rr'r*r/rcr'rLr¿rrr#rrLs rc@sheZdZdZdd„Zdd„Zdd„Zdd „Zd d„Zdd „Z dd„Z dd„Zdd„Zdd„Z dd„ZdS)ra~A watcher that doesn't require running loop in the main thread. 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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)r1Ú_saved_sighandlerrêrrrrÈszMultiLoopChildWatcher.__init__cCs |jduSr)r\rêrrrr`ÌszMultiLoopChildWatcher.is_activecCsT|j ¡|jdurdSt tj¡}||jkr:t d¡nt tj|j¡d|_dS)Nz+SIGCHLD handler was changed by outside code) r1r/r\r<Ú getsignalrMrNr r)r!rRrrrr'Ïs zMultiLoopChildWatcher.closecCs|Srrrêrrrr*ÛszMultiLoopChildWatcher.__enter__cCsdSrr©r!r2Úexc_valÚexc_tbrrrr/ÞszMultiLoopChildWatcher.__exit__cGs&t ¡}|||f|j|<| |¡dSr)rÚget_running_loopr1rK)r!rsrHrIrÏrrrrcász'MultiLoopChildWatcher.add_child_handlercCs(z|j|=WdSty"YdS0dSrPrQr&rrrr'ès z*MultiLoopChildWatcher.remove_child_handlercCsN|jdurdSt tj|j¡|_|jdurKsÿz6ThreadedChildWatcher._join_threads..N)r*rfr9rà)r!ÚthreadsrlrrrrgIsz"ThreadedChildWatcher._join_threadscCs|Srrrêrrrr*PszThreadedChildWatcher.__enter__cCsdSrrr^rrrr/SszThreadedChildWatcher.__exit__cCs6dd„t|j ¡ƒDƒ}|r2||j›dt|ddS)NcSsg|]}| ¡r|‘qSr)rhrjrrrrmWsÿz0ThreadedChildWatcher.__del__..z0 has registered but not finished child processesr%)r*rfr9r$r.)r!r÷rnrrrrøVsþzThreadedChildWatcher.__del__cGsFt ¡}tj|jdt|jƒ›||||fdd}||j|<| ¡dS)Nzwaitpid-T)ÚtargetÚnamerIri) rrarWÚThreadrKÚnextrerfÚstart)r!rsrHrIrÏrlrrrrc^s ý z&ThreadedChildWatcher.add_child_handlercCsdSrrr&rrrr'gsz)ThreadedChildWatcher.remove_child_handlercCsdSrrr(rrrr)msz ThreadedChildWatcher.attach_loopcCs˜zt |d¡\}}Wn&ty:|}d}t d|¡Yn 0t|ƒ}| ¡rZt d||¡| ¡rrt d||¡n|j |||g|¢RŽ|j |¡dS)Nrr?rSrTrb)r|rArBr rrCrærércrrrfr@)r!rÏrJrHrIrsrDrtrrrrKps$þ ÿz ThreadedChildWatcher._do_waitpidN)r»r¼r½r¾rr`r'rgr*r/r,r-rørcr'r)rKrrrrr2s rcsHeZdZdZeZ‡fdd„Zdd„Z‡fdd„Zdd „Z d d„Z ‡ZS)Ú_UnixDefaultEventLoopPolicyz:UNIX event loop policy with a watcher for child processes.cstƒ ¡d|_dSr)rrÚ_watcherrêr#rrrs z$_UnixDefaultEventLoopPolicy.__init__cCs\tjB|jdur:tƒ|_t ¡t ¡ur:|j |jj ¡Wdƒn1sN0YdSr) rrYrurrWÚcurrent_threadÚmain_threadr)Ú_localrÁrêrrrÚ _init_watcher“s z)_UnixDefaultEventLoopPolicy._init_watchercs6tƒ |¡|jdur2t ¡t ¡ur2|j |¡dS)zÑSet 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)rÚset_event_looprurWrvrwr)r(r#rrrzšs ÿz*_UnixDefaultEventLoopPolicy.set_event_loopcCs|jdur| ¡|jS)z~Get the watcher for child processes. If not yet set, a ThreadedChildWatcher object is automatically created. N)ruryrêrrrr_¨s z-_UnixDefaultEventLoopPolicy.get_child_watchercCs|jdur|j ¡||_dS)z$Set the watcher for child processes.N)rur')r!rorrrÚset_child_watcher²s z-_UnixDefaultEventLoopPolicy.set_child_watcher)r»r¼r½r¾rZ _loop_factoryrryrzr_r{r¿rrr#rrt‹s rt)3r¾rFr›rdr|rÝr<r~rrr(rWr,Úrrrrrrr r rrÚlogr Ú__all__rÚImportErrorrZBaseSelectorEventLooprZ ReadTransportrVZ_FlowControlMixinZWriteTransportr]ZBaseSubprocessTransportrbrrrCrIrrrrZBaseDefaultEventLoopPolicyrtrrrrrrÚsb ÿNON5Ji}Y2