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unix_events.cpython-39.pyc
a DOg* @ s d Z ddlZddlZddlZddlZddlZddlZddlZddlZddl Z ddl Z ddl Z ddl Z ddl mZ ddl mZ ddl mZ ddl mZ ddl mZ dd l mZ dd l mZ dd l mZ dd l mZ dd l mZ ddlmZ dZe jdkre ddd Z G dd dej Z G dd dej Z!G dd dej"ej#Z$G dd dej%Z&G d d d Z'G d d d e'Z(d d! Z)G d"d# d#e'Z*G d$d% d%e*Z+G d&d' d'e*Z,G d(d) d)e'Z-G d*d+ d+e'Z.G d,d- d-ej/Z0e Z1e0Z2dS ).z2Selector event loop for Unix with signal handling. N ) base_events)base_subprocess) constants) coroutines)events) exceptions)futures)selector_events)tasks) transports)logger)SelectorEventLoopAbstractChildWatcherSafeChildWatcherFastChildWatcherPidfdChildWatcherMultiLoopChildWatcherThreadedChildWatcherDefaultEventLoopPolicywin32z+Signals are not really supported on Windowsc C s dS )zDummy signal handler.N )signumframer r +/usr/lib64/python3.9/asyncio/unix_events.py_sighandler_noop* s r c s e Zd ZdZd) fdd Z fddZdd Zd d Zd d Zd d Z dd Z d*ddZ d+ddZ d,ddZ dd Zd-dddddddZd.dd ddd d d d Zd!d" Zd#d$ Zd%d& Zd'd( Z ZS )/_UnixSelectorEventLoopzdUnix event loop. Adds signal handling and UNIX Domain Socket support to SelectorEventLoop. Nc s t | i | _d S N)super__init___signal_handlers)selfselector __class__r r r 5 s z _UnixSelectorEventLoop.__init__c sZ t t s.t| jD ]}| | q n(| jrVtjd| dt | d | j d S )NzClosing the loop z@ on interpreter shutdown stage, skipping signal handlers removalsource) r closesys is_finalizinglistr remove_signal_handlerwarningswarnResourceWarningclearr! sigr# r r r' 9 s z _UnixSelectorEventLoop.closec C s |D ]}|sq| | qd S r )_handle_signal)r! datar r r r _process_self_dataG s z)_UnixSelectorEventLoop._process_self_datac G sR t |st |r td| | | zt| j W n4 t t fyv } zt t |W Y d}~n d}~0 0 t||| d}|| j|< z t|t t|d W n t yL } z| j|= | jsztd W n6 t t fy } ztd| W Y d}~n d}~0 0 |jtjkr6t d| dn W Y d}~n d}~0 0 dS )zAdd a handler for a signal. UNIX only. Raise ValueError if the signal number is invalid or uncatchable. Raise RuntimeError if there is a problem setting up the handler. z3coroutines cannot be used with add_signal_handler()NF set_wakeup_fd(-1) failed: %ssig cannot be caught)r Z iscoroutineZiscoroutinefunction TypeError _check_signal _check_closedsignal set_wakeup_fdZ_csockfileno ValueErrorOSError RuntimeErrorstrr Handler r siginterruptr infoerrnoEINVAL)r! r1 callbackargsexchandleZnexcr r r add_signal_handlerN s2 " "z)_UnixSelectorEventLoop.add_signal_handlerc C s8 | j |}|du rdS |jr*| | n | | dS )z2Internal helper that is the actual signal handler.N)r getZ _cancelledr+ Z_add_callback_signalsafe)r! r1 rK r r r r2 { s z%_UnixSelectorEventLoop._handle_signalc C s | | z | j|= W n ty* Y dS 0 |tjkr>tj}ntj}zt|| W nD ty } z,|jtj krt d| dn W Y d}~n d}~0 0 | jszt d W n4 t tfy } zt d| W Y d}~n d}~0 0 dS )zwRemove a handler for a signal. UNIX only. Return True if a signal handler was removed, False if not. Fr7 r8 Nr5 r6 T)r: r KeyErrorr< SIGINTdefault_int_handlerSIG_DFLr@ rF rG rA r= r? r rE )r! r1 handlerrJ r r r r+ s( "z,_UnixSelectorEventLoop.remove_signal_handlerc C s6 t |tstd||t vr2td| dS )zInternal helper to validate a signal. Raise ValueError if the signal number is invalid or uncatchable. Raise RuntimeError if there is a problem setting up the handler. zsig must be an int, not zinvalid signal number N) isinstanceintr9 r< valid_signalsr? r0 r r r r: s z$_UnixSelectorEventLoop._check_signalc C s t | ||||S r )_UnixReadPipeTransportr! pipeprotocolwaiterextrar r r _make_read_pipe_transport s z0_UnixSelectorEventLoop._make_read_pipe_transportc C s t | ||||S r )_UnixWritePipeTransportrW r r r _make_write_pipe_transport s z1_UnixSelectorEventLoop._make_write_pipe_transportc s t } | std| } t| |||||||f| |d| } | | | j| z| I d H W n@ t t fy Y n* t y | | I d H Y n0 W d n1 s0 Y | S )NzRasyncio.get_child_watcher() is not activated, subprocess support is not installed.)rZ r[ )r get_child_watcher is_activerA create_future_UnixSubprocessTransportadd_child_handlerZget_pid_child_watcher_callback SystemExitKeyboardInterrupt BaseExceptionr' _wait) r! rY rI shellstdinstdoutstderrbufsizer[ kwargswatcherrZ transpr r r _make_subprocess_transport s. &z1_UnixSelectorEventLoop._make_subprocess_transportc C s | |j| d S r )call_soon_threadsafeZ_process_exited)r! pid returncoderp r r r rd s z._UnixSelectorEventLoop._child_watcher_callback)sslsockserver_hostnamessl_handshake_timeoutc s |d u st |tsJ |r,|d u rLtdn |d ur<td|d urLtd|d ur|d urdtdt|}ttjtjd}z |d | ||I d H W q | Y q0 n@|d u rtd|j tjks|j tjkrtd||d | j |||||d I d H \}}||fS ) Nz/you have to pass server_hostname when using sslz+server_hostname is only meaningful with ssl1ssl_handshake_timeout is only meaningful with ssl3path and sock can not be specified at the same timer Fz no path and sock were specified.A UNIX Domain Stream Socket was expected, got )rx )rS rB r? osfspathsocketAF_UNIX SOCK_STREAM setblockingZ sock_connectr' familytypeZ _create_connection_transport) r! protocol_factorypathru rv rw rx transportrY r r r create_unix_connection sN z-_UnixSelectorEventLoop.create_unix_connectiond T)rv backlogru rx start_servingc s t |trtd|d ur&|s&td|d urJ|d ur@tdt|}ttjtj}|d dvrz t t |j rt | W nB t y Y n2 ty } ztd|| W Y d }~n d }~0 0 z|| W nn ty2 } z@| | jtjkr d|d} ttj| d n W Y d } ~ n d } ~ 0 | Y n0 n<|d u r\td |jtjksx|jtjkrtd ||d t| |g||||} |r| t dI d H | S ) Nz*ssl argument must be an SSLContext or Nonery rz r )r z2Unable to check or remove stale UNIX socket %r: %rzAddress z is already in usez-path was not specified, and no sock specifiedr{ F) rS boolr9 r? r| r} r~ r r statS_ISSOCKst_moderemoveFileNotFoundErrorr@ r errorbindr' rF Z EADDRINUSEr r r r ZServerZ_start_servingr sleep) r! r r rv r ru rx r errrJ msgZserverr r r create_unix_server sh z)_UnixSelectorEventLoop.create_unix_serverc s z t j W n ty& tdY n0 z | }W n4 ttjfyh } ztdW Y d }~n d }~0 0 zt |j }W n t y tdY n0 |r|n|}|sdS | } | | d |||||d | I d H S )Nz os.sendfile() is not availableznot a regular filer ) r| sendfileAttributeErrorr SendfileNotAvailableErrorr> ioUnsupportedOperationfstatst_sizer@ ra _sock_sendfile_native_impl) r! rv fileoffsetcountr> r fsize blocksizefutr r r _sock_sendfile_nativeJ s, z,_UnixSelectorEventLoop._sock_sendfile_nativec C s, | } |d ur| | | r4| ||| d S |rd|| }|dkrd| ||| || d S zt| |||} W nD ttfy |d u r| || | | | j || |||||| Y nd t yj } z|d ur| j t jkrt| turtdt j} | | _| } |dkr>td} | ||| || n| ||| || W Y d } ~ nd } ~ 0 ttfy Y n ty } z$| ||| || W Y d } ~ nrd } ~ 0 0 | dkr| ||| || nD|| 7 }|| 7 }|d u r | || | | | j || |||||| d S )Nr zsocket is not connectedzos.sendfile call failed)r> remove_writer cancelled _sock_sendfile_update_filepos set_resultr| r BlockingIOErrorInterruptedError _sock_add_cancellation_callbackZ add_writerr r@ rF ZENOTCONNr ConnectionError __cause__r r set_exceptionre rf rg )r! r Z registered_fdrv r> r r r total_sentfdsentrJ new_excr r r r r a sp z1_UnixSelectorEventLoop._sock_sendfile_native_implc C s |dkrt ||t j d S Nr )r| lseekSEEK_SET)r! r> r r r r r r s z4_UnixSelectorEventLoop._sock_sendfile_update_fileposc s fdd}| | d S )Nc s& | r" }|dkr" | d S )Nr5 )r r> r )r r r! rv r r cb s zB_UnixSelectorEventLoop._sock_add_cancellation_callback.<locals>.cb)add_done_callback)r! r rv r r r r r s z6_UnixSelectorEventLoop._sock_add_cancellation_callback)N)NN)NN)N)N)N)__name__ __module__ __qualname____doc__r r' r4 rL r2 r+ r: r\ r^ rq rd r r r r r r __classcell__r r r# r r / sB - . CFr c s e Zd ZdZd fdd Zdd Zdd Zd d Zd d Zd d Z dd Z dd Z dd Z e jfddZd ddZdd Zd d Z ZS ) rV i Nc s t | || jd< || _|| _| | _|| _d| _d| _ t | jj }t |st |st |sd | _d | _d | _tdt | jd | j| jj| | j| jj| j| j |d ur| jtj|d d S )NrX Fz)Pipe transport is for pipes/sockets only.)r r _extra_loop_piper> _fileno _protocol_closing_pausedr| r r r S_ISFIFOr S_ISCHRr? set_blocking call_soonconnection_made _add_reader _read_readyr _set_result_unless_cancelled)r! looprX rY rZ r[ moder# r r r s6 z _UnixReadPipeTransport.__init__c C s | j jg}| jd u r |d n| jr0|d |d| j t| jdd }| jd ur|d urt || jt j }|r|d q|d n | jd ur|d n |d d d |S ) Nclosedclosingfd= _selectorpollingidleopen<{}> )r$ r r appendr r getattrr r _test_selector_event selectors EVENT_READformatjoin)r! rE r" r r r r __repr__ s$ z _UnixReadPipeTransport.__repr__c C s zt | j| j}W nD ttfy* Y n tyX } z| |d W Y d }~nfd }~0 0 |rl| j | nJ| j rt d| d| _| j | j | j | jj | j | jd d S )Nz"Fatal read error on pipe transport%r was closed by peerT)r| readr max_sizer r r@ _fatal_errorr Z data_receivedr get_debugr rE r _remove_readerr Z eof_received_call_connection_lost)r! r3 rJ r r r r s " z"_UnixReadPipeTransport._read_readyc C s> | j s | jrd S d| _| j| j | j r:td| d S )NTz%r pauses reading)r r r r r r r debugr! r r r pause_reading s z$_UnixReadPipeTransport.pause_readingc C sB | j s | jsd S d| _| j| j| j | j r>td| d S )NFz%r resumes reading) r r r r r r r r r r r r r resume_reading s z%_UnixReadPipeTransport.resume_readingc C s || _ d S r r r! rY r r r set_protocol s z#_UnixReadPipeTransport.set_protocolc C s | j S r r r r r r get_protocol s z#_UnixReadPipeTransport.get_protocolc C s | j S r r r r r r is_closing s z!_UnixReadPipeTransport.is_closingc C s | j s| d d S r )r _closer r r r r' s z _UnixReadPipeTransport.closec C s, | j d ur(|d| t| d | j d S Nzunclosed transport r% r r. r' r! _warnr r r __del__ s z _UnixReadPipeTransport.__del__ Fatal error on pipe transportc C sZ t |tr4|jtjkr4| j rLtjd| |dd n| j||| | j d | | d S Nz%r: %sTexc_info)message exceptionr rY ) rS r@ rF ZEIOr r r r call_exception_handlerr r r! rJ r r r r r s z#_UnixReadPipeTransport._fatal_errorc C s( d| _ | j| j | j| j| d S NT)r r r r r r r! rJ r r r r - s z _UnixReadPipeTransport._closec C sP z,| j | W | j d | _d | _ d | _n | j d | _d | _ d | _0 d S r r Zconnection_lostr r' r r r r r r 2 s z,_UnixReadPipeTransport._call_connection_lost)NN)r )r r r r r r r r r r r r r' r, r- r r r r r r r r# r rV s rV c s e Zd Zd% fdd Zdd Zdd Zdd Zd d Zd d Zdd Z dd Z dd Z dd Z dd Z dd ZejfddZd d Zd&d d Zd'd!d"Zd#d$ Z ZS )(r] Nc s t || || jd< || _| | _|| _t | _d| _ d| _ t | jj }t|}t|}t|} |s|s| sd | _d | _d | _tdt | jd | j| jj| | s|rtjds| j| jj| j| j |d ur| jt j |d d S )NrX r Fz?Pipe transport is only for pipes, sockets and character devicesZaix) r r r r r> r r bytearray_buffer _conn_lostr r| r r r r r r r? r r r r r( platform startswithr r r r ) r! r rX rY rZ r[ r Zis_charis_fifo is_socketr# r r r ? s6 z _UnixWritePipeTransport.__init__c C s | j jg}| jd u r |d n| jr0|d |d| j t| jdd }| jd ur|d urt || jt j }|r|d n |d | }|d| n | jd ur|d n |d d d |S ) Nr r r r r r zbufsize=r r r )r$ r r r r r r r r r r EVENT_WRITEget_write_buffer_sizer r )r! rE r" r rm r r r r d s( z _UnixWritePipeTransport.__repr__c C s t | jS r )lenr r r r r r | s z-_UnixWritePipeTransport.get_write_buffer_sizec C s6 | j rtd| | jr*| t n| d S )Nr )r r r rE r r BrokenPipeErrorr r r r r s z#_UnixWritePipeTransport._read_readyc C sL t |tttfs J t|t |tr.t|}|s6d S | jsB| jrj| jtjkrXt d | jd7 _d S | j s2zt | j|}W nn ttfy d}Y nV ttfy Y n@ ty } z(| jd7 _| |d W Y d }~d S d }~0 0 |t|krd S |dkr t||d }| j| j| j | j |7 _ | d S )Nz=pipe closed by peer or os.write(pipe, data) raised exception.r r #Fatal write error on pipe transport)rS bytesr memoryviewreprr r r Z!LOG_THRESHOLD_FOR_CONNLOST_WRITESr warningr r| writer r r re rf rg r r r Z _add_writer _write_readyZ_maybe_pause_protocol)r! r3 nrJ r r r r s8 z _UnixWritePipeTransport.writec C s | j sJ dzt| j| j }W n ttfy8 Y n ttfyN Y n ty } z>| j | j d7 _ | j | j | |d W Y d }~npd }~0 0 |t| j kr| j | j | j | | jr| j | j | d d S |dkr | j d |= d S )NzData should not be emptyr r r )r r| r r r r re rf rg r/ r r _remove_writerr r Z_maybe_resume_protocolr r r )r! r rJ r r r r s, " z$_UnixWritePipeTransport._write_readyc C s dS r r r r r r can_write_eof s z%_UnixWritePipeTransport.can_write_eofc C sB | j r d S | jsJ d| _ | js>| j| j | j| jd d S r )r r r r r r r r r r r r write_eof s z!_UnixWritePipeTransport.write_eofc C s || _ d S r r r r r r r s z$_UnixWritePipeTransport.set_protocolc C s | j S r r r r r r r s z$_UnixWritePipeTransport.get_protocolc C s | j S r r r r r r r s z"_UnixWritePipeTransport.is_closingc C s | j d ur| js| d S r )r r r r r r r r' s z _UnixWritePipeTransport.closec C s, | j d ur(|d| t| d | j d S r r r r r r r s z _UnixWritePipeTransport.__del__c C s | d d S r )r r r r r abort s z _UnixWritePipeTransport.abortr c C sN t |tr(| j r@tjd| |dd n| j||| | jd | | d S r ) rS r@ r r r r r r r r r r r r s z$_UnixWritePipeTransport._fatal_errorc C sF d| _ | jr| j| j | j | j| j | j| j| d S r ) r r r r r r/ r r r r r r r r s z _UnixWritePipeTransport._closec C sP z,| j | W | j d | _d | _ d | _n | j d | _d | _ d | _0 d S r r r r r r r s z-_UnixWritePipeTransport._call_connection_lost)NN)r )N)r r r r r r r r r r r r r r r' r, r- r r r r r r r r r# r r] < s" % # r] c @ s e Zd Zdd ZdS )rb c K s d }|t jkrt \}}zht j|f||||d|d|| _|d urh| t| d|d| j_ d }W |d ur| | n|d ur| | 0 d S )NF)ri rj rk rl universal_newlinesrm wb) buffering) subprocessPIPEr~ socketpairPopen_procr' r detachrj ) r! rI ri rj rk rl rm rn Zstdin_wr r r _start s, z _UnixSubprocessTransport._startN)r r r r$ r r r r rb s rb c @ sH e Zd ZdZdd Zdd Zdd Zdd Zd d Zd d Z dd Z dS )r aH Abstract base class for monitoring child processes. Objects derived from this class monitor a collection of subprocesses and report their termination or interruption by a signal. New callbacks are registered with .add_child_handler(). Starting a new process must be done within a 'with' block to allow the watcher to suspend its activity until the new process if fully registered (this is needed to prevent a race condition in some implementations). Example: with watcher: 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 G s t dS )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. NNotImplementedErrorr! rs rH rI r r r rc 9 s z&AbstractChildWatcher.add_child_handlerc C s t dS )zRemoves the handler for process 'pid'. The function returns True if the handler was successfully removed, False if there was nothing to remove.Nr% r! rs r r r remove_child_handlerD s z)AbstractChildWatcher.remove_child_handlerc C s t dS )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. Nr% r! r r r r attach_loopL s z AbstractChildWatcher.attach_loopc C s t dS )zlClose the watcher. This must be called to make sure that any underlying resource is freed. Nr% r r r r r' V s zAbstractChildWatcher.closec C s t dS )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. Nr% r r r r r` ] s z AbstractChildWatcher.is_activec C s t dS )zdEnter the watcher's context and allow starting new processes This function must return selfNr% r r r r __enter__f s z AbstractChildWatcher.__enter__c C s t dS )zExit the watcher's contextNr% r! abcr r r __exit__l s z AbstractChildWatcher.__exit__N) r r r r rc r) r+ r' r` r, r1 r r r r r " s r c @ sX e Zd ZdZdd Zdd Zdd Zdd Zd d Zd d Z dd Z dd Z dd Z dS )r a6 Child 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 C s d | _ i | _d S r r _callbacksr r r r r } s zPidfdChildWatcher.__init__c C s | S r r r r r r r, s zPidfdChildWatcher.__enter__c C s d S r r )r! exc_type exc_value exc_tracebackr r r r1 s zPidfdChildWatcher.__exit__c C s | j d uo| j S r r Z is_runningr r r r r` s zPidfdChildWatcher.is_activec C s | d d S r r+ r r r r r' s zPidfdChildWatcher.closec C sd | j d ur$|d u r$| jr$tdt | j D ] \}}}| j | t| q.| j || _ d S NzCA loop is being detached from a child watcher with pending handlers) r r3 r, r- RuntimeWarningvaluesr r| r' r/ )r! r pidfd_r r r r+ s z PidfdChildWatcher.attach_loopc G sZ | j |}|d ur*|d ||f| j |< n,t|}| j|| j| |||f| j |< d S r )r3 rM r| pidfd_openr r _do_wait)r! rs rH rI existingr< r r r rc s z#PidfdChildWatcher.add_child_handlerc C s~ | j |\}}}| j| zt|d\}}W n" tyT d}td| Y n 0 t |}t | |||g|R d S )Nr zJchild process pid %d exit status already read: will report returncode 255) r3 popr r r| waitpidChildProcessErrorr r _compute_returncoder' )r! rs r< rH rI r= statusrt r r r r? s zPidfdChildWatcher._do_waitc C sF z| j |\}}}W n ty* Y dS 0 | j| t| dS )NFT)r3 rB rN r r r| r' )r! rs r< r= r r r r) s z&PidfdChildWatcher.remove_child_handlerN) r r r r r r, r1 r` r' r+ rc r? r) r r r r r q s r c C s2 t | rt | S t | r*t | S | S d S r )r| WIFSIGNALEDWTERMSIG WIFEXITED WEXITSTATUS)rF r r r rE s rE c @ sD e Zd Zdd Zdd Zdd Zdd Zd d Zd d Zd d Z dS )BaseChildWatcherc C s d | _ i | _d S r r2 r r r r r s zBaseChildWatcher.__init__c C s | d d S r r8 r r r r r' s zBaseChildWatcher.closec C s | j d uo| j S r r7 r r r r r` s zBaseChildWatcher.is_activec C s t d S r r% )r! expected_pidr r r _do_waitpid s z BaseChildWatcher._do_waitpidc C s t d S r r% r r r r _do_waitpid_all s z BaseChildWatcher._do_waitpid_allc C s~ |d u st |tjsJ | jd ur<|d u r<| jr<tdt | jd urT| jt j || _|d urz| t j | j | d S r9 )rS r ZAbstractEventLoopr r3 r, r- r: r+ r< SIGCHLDrL _sig_chldrN r* r r r r+ s z BaseChildWatcher.attach_loopc C s^ z | W nL ttfy$ Y n6 tyX } z | jd|d W Y d }~n d }~0 0 d S )N$Unknown exception in SIGCHLD handler)r r )rN re rf rg r r r r r r rP s zBaseChildWatcher._sig_chldN) r r r r r' r` rM rN r+ rP r r r r rK s rK c sP e Zd ZdZ fddZdd Zdd Zdd Zd d Zd d Z dd Z Z S )r ad '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) c s | j t d S r )r3 r/ r r' r r# r r r' s zSafeChildWatcher.closec C s | S r r r r r r r, s zSafeChildWatcher.__enter__c C s d S r r r- r r r r1 s zSafeChildWatcher.__exit__c G s ||f| j |< | | d S r )r3 rM r' r r r rc s z"SafeChildWatcher.add_child_handlerc C s( z| j |= W dS ty" Y dS 0 d S NTFr3 rN r( r r r r) s z%SafeChildWatcher.remove_child_handlerc C s t | jD ]}| | q d S r r* r3 rM r( r r r rN $ s z SafeChildWatcher._do_waitpid_allc C s |dks J zt |t j\}}W n& tyH |}d}td| Y n.0 |dkrVd S t|}| j rvt d|| z| j |\}}W n, t y | j rtjd|dd Y n0 |||g|R d S )Nr rA 8Unknown child process pid %d, will report returncode 255$process %s exited with returncode %s'Child watcher got an unexpected pid: %rTr ) r| rC WNOHANGrD r r rE r r r r3 rB rN )r! rL rs rF rt rH rI r r r rM ) s2 z SafeChildWatcher._do_waitpid) r r r r r' r, r1 rc r) rN rM r r r r# r r s r c sT e Zd ZdZ fddZ fddZdd Zdd Zd d Zd d Z dd Z Z S )r aW 'Fast' child watcher implementation. This implementation reaps every terminated processes by calling os.waitpid(-1) directly, possibly breaking other code spawning processes and waiting for their termination. There is no noticeable overhead when handling a big number of children (O(1) each time a child terminates). c s$ t t | _i | _d| _d S r )r r threadingLock_lock_zombies_forksr r# r r r V s zFastChildWatcher.__init__c s" | j | j t d S r )r3 r/ r\ r r' r r# r r r' \ s zFastChildWatcher.closec C s< | j " | jd7 _| W d S 1 s.0 Y d S )Nr )r[ r] r r r r r, a s zFastChildWatcher.__enter__c C st | j N | jd8 _| js"| js2W d d S t| j}| j W d n1 sZ0 Y td| d S )Nr z5Caught subprocesses termination from unknown pids: %s)r[ r] r\ rB r/ r r )r! r. r/ r0 Zcollateral_victimsr r r r1 g s (zFastChildWatcher.__exit__c G s | j sJ d| jP z| j|}W n. tyT ||f| j|< Y W d d S 0 W d n1 sj0 Y |||g|R d S )Nz Must use the context manager)r] r[ r\ rB rN r3 )r! rs rH rI rt r r r rc u s 2z"FastChildWatcher.add_child_handlerc C s( z| j |= W dS ty" Y dS 0 d S rR rS r( r r r r) s z%FastChildWatcher.remove_child_handlerc C s zt dt j\}}W n ty* Y d S 0 |dkr8d S t|}| j z| j|\}}W nN ty | j r|| j |< | j rt d|| Y W d q d }Y n0 | j rt d|| W d n1 s0 Y |d u rt d|| q |||g|R q d S )Nr5 r z,unknown process %s exited with returncode %srV z8Caught subprocess termination from unknown pid: %d -> %d)r| rC rX rD rE r[ r3 rB rN r] r\ r r r r r )r! rs rF rt rH rI r r r rN s: "z FastChildWatcher._do_waitpid_all) r r r r r r' r, r1 rc r) rN r r r r# r r L s r c @ sh e Zd ZdZdd Zdd Zdd Zdd Zd d Zd d Z dd Z dd Z dd Z dd Z dd ZdS )r a~ 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). c C s i | _ d | _d S r )r3 _saved_sighandlerr r r r r s z MultiLoopChildWatcher.__init__c C s | j d uS r )r^ r r r r r` s z MultiLoopChildWatcher.is_activec C sT | j | jd u rd S ttj}|| jkr:td nttj| j d | _d S )Nz+SIGCHLD handler was changed by outside code) r3 r/ r^ r< getsignalrO rP r r )r! rR r r r r' s zMultiLoopChildWatcher.closec C s | S r r r r r r r, s z MultiLoopChildWatcher.__enter__c C s d S r r r! r4 exc_valexc_tbr r r r1 s z MultiLoopChildWatcher.__exit__c G s& t }|||f| j|< | | d S r )r get_running_loopr3 rM )r! rs rH rI r r r r rc s z'MultiLoopChildWatcher.add_child_handlerc C s( z| j |= W dS ty" Y dS 0 d S rR rS r( r r r r) s z*MultiLoopChildWatcher.remove_child_handlerc C sN | j d urd S ttj| j| _ | j d u r<td tj| _ ttjd d S )NzaPrevious SIGCHLD handler was set by non-Python code, restore to default handler on watcher close.F)r^ r< rO rP r r rQ rD r* r r r r+ s z!MultiLoopChildWatcher.attach_loopc C s t | jD ]}| | q d S r rT r( r r r rN s z%MultiLoopChildWatcher._do_waitpid_allc C s |dks J zt |t j\}}W n* tyL |}d}td| d}Y n0 |dkrZd S t|}d}z| j|\}}}W n" t y tjd|dd Y nJ0 | rtd|| n0|r| rt d || |j |||g|R d S ) Nr rA rU FTrW r %Loop %r that handles pid %r is closedrV )r| rC rX rD r r rE r3 rB rN is_closedr r rr ) r! rL rs rF rt Z debug_logr rH rI r r r rM s8 z!MultiLoopChildWatcher._do_waitpidc C sH z | W n6 ttfy$ Y n tyB tjddd Y n0 d S )NrQ Tr )rN re rf rg r r )r! r r r r r rP ) s z MultiLoopChildWatcher._sig_chldN)r r r r r r` r' r, r1 rc r) r+ rN rM rP r r r r r s %r c @ sn e Zd ZdZdd Zdd Zdd Zdd Zd d Zd d Z e j fddZ dd Z dd Zdd Zdd ZdS )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 C s t d| _i | _d S r ) itertoolsr _pid_counter_threadsr r r r r ? s z ThreadedChildWatcher.__init__c C s dS r r r r r r r` C s z ThreadedChildWatcher.is_activec C s | d S r ) _join_threadsr r r r r' F s zThreadedChildWatcher.closec C s. dd t | j D }|D ] }| q dS )z%Internal: Join all non-daemon threadsc S s g | ]}| r|js|qS r )is_alivedaemon.0threadr r r <listcomp>K s z6ThreadedChildWatcher._join_threads.<locals>.<listcomp>N)r* rh r; r )r! threadsrn r r r ri I s z"ThreadedChildWatcher._join_threadsc C s | S r r r r r r r, P s z ThreadedChildWatcher.__enter__c C s d S r r r` r r r r1 S s z ThreadedChildWatcher.__exit__c C s6 dd t | j D }|r2|| j dt| d d S )Nc S s g | ]}| r|qS r )rj rl r r r ro W s z0ThreadedChildWatcher.__del__.<locals>.<listcomp>z0 has registered but not finished child processesr% )r* rh r; r$ r. )r! r rp r r r r V s z ThreadedChildWatcher.__del__c G sF t }tj| jdt| j ||||fdd}|| j|< | d S )Nzwaitpid-T)targetnamerI rk ) r rc rY ThreadrM nextrg rh start)r! rs rH rI r rn r r r rc ^ s z&ThreadedChildWatcher.add_child_handlerc C s dS r r r( r r r r) g s z)ThreadedChildWatcher.remove_child_handlerc C s d S r r r* r r r r+ m s z ThreadedChildWatcher.attach_loopc C s |dks J zt |d\}}W n& tyF |}d}td| Y n 0 t|}| rftd|| | r~td|| n|j |||g|R | j | d S )Nr rA rU rV rd ) r| rC rD r r rE r r re rr rh rB )r! r rL rH rI rs rF rt r r r rM p s& z ThreadedChildWatcher._do_waitpidN)r r r r r r` r' ri r, r1 r, r- r rc r) r+ rM r r r r r 2 s r c sH e Zd ZdZeZ fddZdd Z fddZdd Z d d Z 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$_UnixDefaultEventLoopPolicy.__init__c C s\ t jB | jd u r:t | _t t u r:| j| jj W d n1 sN0 Y d S r ) r r[ rw r rY current_thread main_threadr+ _localr r r r r _init_watcher s z)_UnixDefaultEventLoopPolicy._init_watcherc s6 t | | jdur2t t u r2| j| dS )zSet the event loop. As a side effect, if a child watcher was set before, then calling .set_event_loop() from the main thread will call .attach_loop(loop) on the child watcher. N)r set_event_looprw rY rx ry r+ r* r# r r r| s z*_UnixDefaultEventLoopPolicy.set_event_loopc C s | j du r| | j S )z~Get the watcher for child processes. If not yet set, a ThreadedChildWatcher object is automatically created. N)rw r{ r r r r r_ s z-_UnixDefaultEventLoopPolicy.get_child_watcherc C s4 |du st |tsJ | jdur*| j || _dS )z$Set the watcher for child processes.N)rS r rw r' )r! ro r r r set_child_watcher s z-_UnixDefaultEventLoopPolicy.set_child_watcher) r r r r r Z _loop_factoryr r{ r| r_ r} r r r r# r rv s rv )3r rF r rf r| r r< r~ r r r( rY r, r r r r r r r r r r logr __all__r ImportErrorr ZBaseSelectorEventLoopr Z ReadTransportrV Z_FlowControlMixinZWriteTransportr] ZBaseSubprocessTransportrb r r rE rK r r r r ZBaseDefaultEventLoopPolicyrv r r r r r r <module> sb NON5Ji}Y2