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Return True if the watcher is installed and ready to handle process exit notifications. rrs rrzzAbstractChildWatcher.is_actives "##rct)zdEnter the watcher's context and allow starting new processes This function must return selfrrs r __enter__zAbstractChildWatcher.__enter__s "##rct)zExit the watcher's contextrr+abcs r__exit__zAbstractChildWatcher.__exit__s !##r)returnN) rrrrrr}rrr1rzrrrrrrrAs/,. $$$$$$ $rrc@eZdZdZdZdZdZdZdZdZ dZ d Z y ) ra6Child watcher implementation using Linux's pid file descriptors. 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|Sr rrs rrzPidfdChildWatcher.__enter__ rcyr r)r+exc_type exc_value exc_tracebacks rrzPidfdChildWatcher.__exit__ rcyrFrrs rrzzPidfdChildWatcher.is_activerqrcyr rrs rr1zPidfdChildWatcher.closerrcyr rrs rrzPidfdChildWatcher.attach_looprrctj}tj|}|j ||j ||||yr )rget_running_loopr! pidfd_openr_do_wait)r+rrUrVrpidfds rr}z#PidfdChildWatcher.add_child_handlers:&&( c"  sE8TJrc$tj}|j| tj|d\}}t |}tj||||g|y#t $rd}tjd|YCwxYw)NrzJchild process pid %d exit status already read: will report returncode 255) rrrr!waitpidr"ChildProcessErrorrrfr1) r+rrrUrVr_r$rs rrzPidfdChildWatcher._do_waits&&( E" 8 3*IAv07J j(4(! J NN.   sA++!BBcyrFrrs rrz&PidfdChildWatcher.remove_child_handlerrN) rrrrrrrzr1rr}rrrrrrrs0    K )&rrc6eZdZdZdZdZdZdZdZdZ y) BaseChildWatcherc d|_i|_yr )r _callbacksrs rr)zBaseChildWatcher.__init__s rc&|jdyr )rrs rr1zBaseChildWatcher.closes rcV|jduxr|jjSr )r is_runningrs rrzzBaseChildWatcher.is_actives#zz%A$***?*?*AArctr r)r+ expected_pids r _do_waitpidzBaseChildWatcher._do_waitpid !##rctr rrs r_do_waitpid_allz BaseChildWatcher._do_waitpid_allrrc|t|tjsJ|j(|&|jrt j dt|j)|jjtj||_|;|jtj|j|jyy)NzCA loop is being detached from a child watcher with pending handlers)rfrAbstractEventLooprrr6r7RuntimeWarningr5rISIGCHLDrZ _sig_chldrrs rrzBaseChildWatcher.attach_loops|z$0H0HIII :: !dlt MM= :: ! JJ , ,V^^ <    # #FNNDNN C  " rc |jy#ttf$rt$r(}|jj d|dYd}~yd}~wwxYw)N$Unknown exception in SIGCHLD handler)r@rA)rrrrrrCrGs rrzBaseChildWatcher._sig_chldsX   "-.    JJ - -A /    sAAAN) rrrr)r1rzrrrrrrrrrs&B$$#( rrcPeZdZdZfdZfdZdZdZdZdZ dZ d Z xZ S) rad'Safe' child watcher implementation. 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) cRt|tjdddy)Nrrrr)r(r)r6rr+r-s rr)zSafeChildWatcher.__init__s' /;%, .rcV|jjt| yr )rr9r(r1rs rr1zSafeChildWatcher.closes   rc|Sr rrs rrzSafeChildWatcher.__enter__rrcyr rrs rrzSafeChildWatcher.__exit__rrcH||f|j|<|j|yr )rrrs rr}z"SafeChildWatcher.add_child_handler"s% ($/ rc> |j|=y#t$rYywxYwNTFrr`rs rrz%SafeChildWatcher.remove_child_handler(( $    cZt|jD]}|j|yr r4rrrs rrz SafeChildWatcher._do_waitpid_all/s(( "C   S ! "rc|dkDsJ tj|tj\}}|dk(ryt|}|jj rt jd|| |jj|\}}|||g|y#t$r|}d}t jd|YOwxYw#t$r7|jj rt jd|dYyYywxYw)Nr$process %s exited with returncode %sr8Unknown child process pid %d, will report returncode 255'Child watcher got an unexpected pid: %rTr>) r!rWNOHANGr"rrrr#rrfrpopr`)r+rrr$rrUrVs rrzSafeChildWatcher._do_waitpid4sa 7**\2::>KCax/7Jzz##% C):7 -!__005NHd S* ,t ,7! CJ NNJ   ( 3zz##%H"T3& 3s#'B4C#CC;DD) rrrrr)r1rrr}rrrrrs@rrrs0.  " -rrcJeZdZdZfdZfdZdZdZdZdZ dZ xZ S) 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). ct|tj|_i|_d|_tjdddy)Nrrrrr) r(r) threadingLock_lock_zombies_forksr6rrs rr)zFastChildWatcher.__init__asC ^^%   /;%, .rc|jj|jjt|yr )rr9rr(r1rs rr1zFastChildWatcher.closeks,    rct|j5|xjdz c_|cdddS#1swYyxYw)Nr)rrrs rrzFastChildWatcher.__enter__ps/ ZZ  KK1 K   s.7c>|j5|xjdzc_|js |js dddyt|j}|jj dddt j dy#1swY xYw)Nrz5Caught subprocesses termination from unknown pids: %s)rrrrOr9rrf)r+rrrcollateral_victimss rrzFastChildWatcher.__exit__vs{ ZZ " KK1 K{{$--  " " "%T]]!3  MM   ! "  C   " "s/B/BBc |jsJd|j5 |jj|} ddd||g|y#t$r||f|j |<YdddywxYw#1swY |j|=y#t$rYywxYwrrrs rrz%FastChildWatcher.remove_child_handlerrrc tjdtj\}}|dk(ryt|}|j 5 |j j|\}}|jjrtjd|| dddtjd||n |||g#t$rYywxYw#t$r\|jrK||j|<|jjrtjd||Yddd4d}YwxYw#1swYxYw)Nr@rrz,unknown process %s exited with returncode %sz8Caught subprocess termination from unknown pid: %d -> %d)r!rrr"rrrrrrrr#r`rrrf)r+rr$rrUrVs rrz FastChildWatcher._do_waitpid_allsC < jjRZZ8 V !83F;  66%)__%8%8%=NHdzz++- %K%(*6! 6& #Z1j040K%   ${{-7 c*:://1"LL*>),j:! 6 6 $H $ 6 6sN'CD= C'2D= CCAD:*D=5D:7D=9D::D==E) rrrrr)r1rrr}rrrrs@rrrWs+.    )(1rrcReZdZdZdZdZdZdZdZdZ dZ d Z d Z d Z d Zy )ra~A watcher that doesn't require running loop in the main thread. This implementation registers a SIGCHLD signal handler on instantiation (which may conflict with other code that install own handler for this signal). 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). cPi|_d|_tjdddy)Nrrrr)r_saved_sighandlerr6rrs rr)zMultiLoopChildWatcher.__init__s*!%4;%, .rc|jduSr )rrs rrzzMultiLoopChildWatcher.is_actives%%T11rcZ|jj|jytjtj }||j k7rtjdd|_ytjtj |jd|_y)Nz+SIGCHLD handler was changed by outside code) rr9rrI getsignalrrrrf)r+rds rr1zMultiLoopChildWatcher.closesz   ! ! ) ""6>>2 dnn $ NNH I"& MM&..$*@*@ A!%rc|Sr rrs rrzMultiLoopChildWatcher.__enter__rrcyr rr+rexc_valexc_tbs rrzMultiLoopChildWatcher.__exit__rrcrtj}|||f|j|<|j|yr )rrrr)r+rrUrVrs rr}z'MultiLoopChildWatcher.add_child_handlers5&&( $h5 rc> |j|=y#t$rYywxYwrrrs rrz*MultiLoopChildWatcher.remove_child_handlerrrc8|jytjtj|j|_|j*t j dtj |_tjtjdy)NzaPrevious SIGCHLD handler was set by non-Python code, restore to default handler on watcher close.F)rrIrrrrfrcrQrs rrz!MultiLoopChildWatcher.attach_loopso  ! ! - !'v~~t~~!N  ! ! ) NNJ K%+^^D " FNNE2rcZt|jD]}|j|yr rrs rrz%MultiLoopChildWatcher._do_waitpid_alls(( "C   S ! "rc8|dkDsJ tj|tj\}}|dk(ryt|}d} |jj|\}}}|jrt j d||y|r'|jrt jd|||j|||g|y#t$r|}d}t j d|d}YwxYw#t$rt j d|d YywxYw) NrTrrF%Loop %r that handles pid %r is closedrrr>)r!rrr"rrrfrr is_closedrr#rr`) r+rrr$r debug_logrrUrVs rrz!MultiLoopChildWatcher._do_waitpidsa **\2::>KCax/7JI L#'??#6#6s#; D(D~~FcR!1LL!G!-z;)))(CKdK=! CJ NNJ I $ / NND / /s#'C C5 %C21C25!DDc |jy#ttf$rt$rt j ddYywxYw)NrTr>)rrrrrrf)r+rrs rrzMultiLoopChildWatcher._sig_chld<sE R  "-.   R NNAD Q Rs/AAN)rrrrr)rzr1rrr}rrrrrrrrrrsA $.2 & 3""#LJRrrcdeZdZdZdZdZdZdZdZe jfdZ dZ d Z d Zd Zy ) raAThreaded 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. cFtjd|_i|_yr) itertoolsr _pid_counter_threadsrs rr)zThreadedChildWatcher.__init__Rs%OOA. rcyrFrrs rrzzThreadedChildWatcher.is_activeVrqrcyr rrs rr1zThreadedChildWatcher.closeYrrc|Sr rrs rrzThreadedChildWatcher.__enter__\rrcyr rrs rrzThreadedChildWatcher.__exit___rrct|jjDcgc]}|jr|}}|r||jdt |yycc}w)Nz0 has registered but not finished child processesr/)r4rvaluesis_aliver-r8)r+r9threadthreadss rr:zThreadedChildWatcher.__del__bsd(,T]]-A-A-C(D)foo'))  T^^$$TU!  )sA!ctj}tj|jdt |j ||||fd}||j|<|jy)Nzasyncio-waitpid-T)targetnamerVdaemon) rrrThreadrnextrrstart)r+rrUrVrrs rr}z&ThreadedChildWatcher.add_child_handlerjsf&&(!!)9)9)9$t?P?P:Q9R'S(,c8T'B)-/$ c rcyrFrrs rrz)ThreadedChildWatcher.remove_child_handlersrrcyr rrs rrz ThreadedChildWatcher.attach_loopyrrc|dkDsJ tj|d\}}t|}|jrt j d|| |jrt jd||n|j|||g||jj|y#t $r|}d}t jd|Y~wxYw)Nrrrrr) r!rr"rrr#rrfrrrr)r+rrrUrVrr$rs rrz ThreadedChildWatcher._do_waitpid|sa 7**\15KC07J~~ C):7 >>  NNBD# N %D % %hZ G$ G ,''! CJ NNJ   sB..#CCN)rrrrr)rzr1rrr6r7r:r}rrrrrrrrEsB   %MM  (rrcttdsy tj}tjtj|dy#t $rYywxYw)NrFrT)hasattrr!getpidr1rrM)rs r can_use_pidfdr&sO 2| $iik sA&'  s=A AAcBeZdZdZeZfdZdZfdZdZ dZ xZ S)_UnixDefaultEventLoopPolicyz:UNIX event loop policy with a watcher for child processes.c0t|d|_yr )r(r)_watcherrs rr)z$_UnixDefaultEventLoopPolicy.__init__s  rctj5|j)trt |_nt |_dddy#1swYyxYwr )rrr*r&rrrs r _init_watcherz)_UnixDefaultEventLoopPolicy._init_watchersA \\ ;}}$ ?$5$7DM$8$:DM  ; ; ;s 6AAct|||jEtjtj ur|jj |yyy)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*rcurrent_thread main_threadr)r+rr-s rr.z*_UnixDefaultEventLoopPolicy.set_event_loopsS t$ MM %((*i.C.C.EE MM % %d +F &rc|j|jtjddd|jS)z~Get the watcher for child processes. If not yet set, a ThreadedChildWatcher object is automatically created. ryrrr)r*r,r6rrs rryz-_UnixDefaultEventLoopPolicy.get_child_watchers@ ==    0:BI K}}rc|t|tsJ|j|jj||_t j dddy)z$Set the watcher for child processes.Nset_child_watcherrrr)rfrr*r1r6r)r+rs rr3z-_UnixDefaultEventLoopPolicy.set_child_watchersT*W6J"KKK == $ MM   ! 0:BI Kr) rrrrr& _loop_factoryr)r,r.ryr3rrs@rr(r(s%D*M; ,  Krr()4rrSrr r!rrIrrrr2rr6rrrrrr r r r r logr__all__rT ImportErrorrr"BaseSelectorEventLoopr& ReadTransportrj_FlowControlMixinWriteTransportrrBaseSubprocessTransportr|rrrrrrrr&BaseDefaultEventLoopPolicyr(rrrrrr?se8     <<7 C DD P"_BBP"f MZ55M`Jj::(77JZ FF 0S$S$l7,7t2+2jN-'N-bj1'j1Z~R0~RBO(/O(b 6K&"C"C6Kr+4r