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asyncio: Refactor SIGCHLD handling. By Anthony Baire.
This commit is contained in:
Guido van Rossum
parent
ccea08462b
commit
0eaa5ac9b5
5 changed files with 1315 additions and 199 deletions
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@ -1,10 +1,11 @@
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"""Event loop and event loop policy."""
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__all__ = ['AbstractEventLoopPolicy', 'DefaultEventLoopPolicy',
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__all__ = ['AbstractEventLoopPolicy',
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'AbstractEventLoop', 'AbstractServer',
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'Handle', 'TimerHandle',
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'get_event_loop_policy', 'set_event_loop_policy',
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'get_event_loop', 'set_event_loop', 'new_event_loop',
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'get_child_watcher', 'set_child_watcher',
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]
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import subprocess
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@ -318,8 +319,18 @@ def new_event_loop(self):
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"""XXX"""
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raise NotImplementedError
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# Child processes handling (Unix only).
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class DefaultEventLoopPolicy(threading.local, AbstractEventLoopPolicy):
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def get_child_watcher(self):
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"""XXX"""
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raise NotImplementedError
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def set_child_watcher(self, watcher):
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"""XXX"""
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raise NotImplementedError
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class BaseDefaultEventLoopPolicy(AbstractEventLoopPolicy):
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"""Default policy implementation for accessing the event loop.
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In this policy, each thread has its own event loop. However, we
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@ -332,28 +343,34 @@ class DefaultEventLoopPolicy(threading.local, AbstractEventLoopPolicy):
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associated).
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"""
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_loop_factory = None
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class _Local(threading.local):
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_loop = None
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_set_called = False
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def __init__(self):
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self._local = self._Local()
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def get_event_loop(self):
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"""Get the event loop.
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This may be None or an instance of EventLoop.
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"""
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if (self._loop is None and
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not self._set_called and
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if (self._local._loop is None and
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not self._local._set_called and
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isinstance(threading.current_thread(), threading._MainThread)):
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self._loop = self.new_event_loop()
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assert self._loop is not None, \
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self._local._loop = self.new_event_loop()
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assert self._local._loop is not None, \
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('There is no current event loop in thread %r.' %
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threading.current_thread().name)
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return self._loop
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return self._local._loop
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def set_event_loop(self, loop):
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"""Set the event loop."""
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self._set_called = True
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self._local._set_called = True
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assert loop is None or isinstance(loop, AbstractEventLoop)
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self._loop = loop
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self._local._loop = loop
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def new_event_loop(self):
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"""Create a new event loop.
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@ -361,12 +378,7 @@ def new_event_loop(self):
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You must call set_event_loop() to make this the current event
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loop.
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"""
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if sys.platform == 'win32': # pragma: no cover
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from . import windows_events
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return windows_events.SelectorEventLoop()
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else: # pragma: no cover
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from . import unix_events
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return unix_events.SelectorEventLoop()
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return self._loop_factory()
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# Event loop policy. The policy itself is always global, even if the
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@ -375,12 +387,22 @@ def new_event_loop(self):
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# call to get_event_loop_policy().
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_event_loop_policy = None
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# Lock for protecting the on-the-fly creation of the event loop policy.
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_lock = threading.Lock()
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def _init_event_loop_policy():
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global _event_loop_policy
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with _lock:
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if _event_loop_policy is None: # pragma: no branch
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from . import DefaultEventLoopPolicy
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_event_loop_policy = DefaultEventLoopPolicy()
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def get_event_loop_policy():
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"""XXX"""
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global _event_loop_policy
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if _event_loop_policy is None:
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_event_loop_policy = DefaultEventLoopPolicy()
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_init_event_loop_policy()
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return _event_loop_policy
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@ -404,3 +426,13 @@ def set_event_loop(loop):
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def new_event_loop():
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"""XXX"""
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return get_event_loop_policy().new_event_loop()
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def get_child_watcher():
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"""XXX"""
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return get_event_loop_policy().get_child_watcher()
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def set_child_watcher(watcher):
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"""XXX"""
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return get_event_loop_policy().set_child_watcher(watcher)
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@ -8,6 +8,7 @@
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import stat
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import subprocess
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import sys
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import threading
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from . import base_subprocess
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@ -20,7 +21,10 @@
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from .log import logger
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__all__ = ['SelectorEventLoop', 'STDIN', 'STDOUT', 'STDERR']
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__all__ = ['SelectorEventLoop', 'STDIN', 'STDOUT', 'STDERR',
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'AbstractChildWatcher', 'SafeChildWatcher',
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'FastChildWatcher', 'DefaultEventLoopPolicy',
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]
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STDIN = 0
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STDOUT = 1
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@ -31,7 +35,7 @@
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raise ImportError('Signals are not really supported on Windows')
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class SelectorEventLoop(selector_events.BaseSelectorEventLoop):
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class _UnixSelectorEventLoop(selector_events.BaseSelectorEventLoop):
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"""Unix event loop
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Adds signal handling to SelectorEventLoop
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@ -40,17 +44,10 @@ class SelectorEventLoop(selector_events.BaseSelectorEventLoop):
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def __init__(self, selector=None):
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super().__init__(selector)
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self._signal_handlers = {}
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self._subprocesses = {}
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def _socketpair(self):
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return socket.socketpair()
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def close(self):
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handler = self._signal_handlers.get(signal.SIGCHLD)
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if handler is not None:
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self.remove_signal_handler(signal.SIGCHLD)
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super().close()
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def add_signal_handler(self, sig, callback, *args):
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"""Add a handler for a signal. UNIX only.
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@ -152,49 +149,20 @@ def _make_write_pipe_transport(self, pipe, protocol, waiter=None,
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def _make_subprocess_transport(self, protocol, args, shell,
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stdin, stdout, stderr, bufsize,
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extra=None, **kwargs):
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self._reg_sigchld()
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with events.get_child_watcher() as watcher:
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transp = _UnixSubprocessTransport(self, protocol, args, shell,
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stdin, stdout, stderr, bufsize,
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extra=None, **kwargs)
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self._subprocesses[transp.get_pid()] = transp
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watcher.add_child_handler(transp.get_pid(),
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self._child_watcher_callback, transp)
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yield from transp._post_init()
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return transp
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def _reg_sigchld(self):
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if signal.SIGCHLD not in self._signal_handlers:
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self.add_signal_handler(signal.SIGCHLD, self._sig_chld)
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def _child_watcher_callback(self, pid, returncode, transp):
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self.call_soon_threadsafe(transp._process_exited, returncode)
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def _sig_chld(self):
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try:
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# Because of signal coalescing, we must keep calling waitpid() as
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# long as we're able to reap a child.
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while True:
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try:
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pid, status = os.waitpid(-1, os.WNOHANG)
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except ChildProcessError:
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break # No more child processes exist.
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if pid == 0:
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break # All remaining child processes are still alive.
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elif os.WIFSIGNALED(status):
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# A child process died because of a signal.
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returncode = -os.WTERMSIG(status)
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elif os.WIFEXITED(status):
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# A child process exited (e.g. sys.exit()).
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returncode = os.WEXITSTATUS(status)
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else:
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# A child exited, but we don't understand its status.
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# This shouldn't happen, but if it does, let's just
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# return that status; perhaps that helps debug it.
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returncode = status
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transp = self._subprocesses.get(pid)
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if transp is not None:
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transp._process_exited(returncode)
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except Exception:
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logger.exception('Unknown exception in SIGCHLD handler')
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def _subprocess_closed(self, transport):
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pid = transport.get_pid()
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self._subprocesses.pop(pid, None)
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def _subprocess_closed(self, transp):
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pass
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def _set_nonblocking(fd):
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@ -423,3 +391,335 @@ def _start(self, args, shell, stdin, stdout, stderr, bufsize, **kwargs):
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if stdin_w is not None:
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stdin.close()
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self._proc.stdin = open(stdin_w.detach(), 'rb', buffering=bufsize)
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class AbstractChildWatcher:
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"""Abstract base class for monitoring child processes.
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Objects derived from this class monitor a collection of subprocesses and
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report their termination or interruption by a signal.
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New callbacks are registered with .add_child_handler(). Starting a new
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process must be done within a 'with' block to allow the watcher to suspend
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its activity until the new process if fully registered (this is needed to
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prevent a race condition in some implementations).
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Example:
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with watcher:
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proc = subprocess.Popen("sleep 1")
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watcher.add_child_handler(proc.pid, callback)
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Notes:
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Implementations of this class must be thread-safe.
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Since child watcher objects may catch the SIGCHLD signal and call
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waitpid(-1), there should be only one active object per process.
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"""
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def add_child_handler(self, pid, callback, *args):
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"""Register a new child handler.
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Arrange for callback(pid, returncode, *args) to be called when
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process 'pid' terminates. Specifying another callback for the same
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process replaces the previous handler.
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Note: callback() must be thread-safe
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"""
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raise NotImplementedError()
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def remove_child_handler(self, pid):
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"""Removes the handler for process 'pid'.
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The function returns True if the handler was successfully removed,
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False if there was nothing to remove."""
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raise NotImplementedError()
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def set_loop(self, loop):
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"""Reattach the watcher to another event loop.
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Note: loop may be None
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"""
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raise NotImplementedError()
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def close(self):
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"""Close the watcher.
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This must be called to make sure that any underlying resource is freed.
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"""
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raise NotImplementedError()
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def __enter__(self):
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"""Enter the watcher's context and allow starting new processes
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This function must return self"""
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raise NotImplementedError()
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def __exit__(self, a, b, c):
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"""Exit the watcher's context"""
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raise NotImplementedError()
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class BaseChildWatcher(AbstractChildWatcher):
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def __init__(self, loop):
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self._loop = None
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self._callbacks = {}
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self.set_loop(loop)
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def close(self):
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self.set_loop(None)
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self._callbacks.clear()
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def _do_waitpid(self, expected_pid):
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raise NotImplementedError()
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def _do_waitpid_all(self):
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raise NotImplementedError()
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def set_loop(self, loop):
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assert loop is None or isinstance(loop, events.AbstractEventLoop)
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if self._loop is not None:
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self._loop.remove_signal_handler(signal.SIGCHLD)
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self._loop = loop
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if loop is not None:
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loop.add_signal_handler(signal.SIGCHLD, self._sig_chld)
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# Prevent a race condition in case a child terminated
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# during the switch.
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self._do_waitpid_all()
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def remove_child_handler(self, pid):
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try:
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del self._callbacks[pid]
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return True
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except KeyError:
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return False
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def _sig_chld(self):
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try:
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self._do_waitpid_all()
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except Exception:
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logger.exception('Unknown exception in SIGCHLD handler')
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def _compute_returncode(self, status):
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if os.WIFSIGNALED(status):
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# The child process died because of a signal.
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return -os.WTERMSIG(status)
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elif os.WIFEXITED(status):
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# The child process exited (e.g sys.exit()).
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return os.WEXITSTATUS(status)
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else:
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# The child exited, but we don't understand its status.
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# This shouldn't happen, but if it does, let's just
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# return that status; perhaps that helps debug it.
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return status
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class SafeChildWatcher(BaseChildWatcher):
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"""'Safe' child watcher implementation.
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This implementation avoids disrupting other code spawning processes by
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polling explicitly each process in the SIGCHLD handler instead of calling
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os.waitpid(-1).
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This is a safe solution but it has a significant overhead when handling a
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big number of children (O(n) each time SIGCHLD is raised)
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"""
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def __enter__(self):
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return self
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def __exit__(self, a, b, c):
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pass
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def add_child_handler(self, pid, callback, *args):
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self._callbacks[pid] = callback, args
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# Prevent a race condition in case the child is already terminated.
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self._do_waitpid(pid)
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def _do_waitpid_all(self):
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for pid in list(self._callbacks):
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self._do_waitpid(pid)
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def _do_waitpid(self, expected_pid):
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assert expected_pid > 0
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try:
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pid, status = os.waitpid(expected_pid, os.WNOHANG)
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except ChildProcessError:
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# The child process is already reaped
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# (may happen if waitpid() is called elsewhere).
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pid = expected_pid
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returncode = 255
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logger.warning(
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"Unknown child process pid %d, will report returncode 255",
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pid)
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else:
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if pid == 0:
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# The child process is still alive.
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return
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returncode = self._compute_returncode(status)
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try:
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callback, args = self._callbacks.pop(pid)
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except KeyError: # pragma: no cover
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# May happen if .remove_child_handler() is called
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# after os.waitpid() returns.
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pass
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else:
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callback(pid, returncode, *args)
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class FastChildWatcher(BaseChildWatcher):
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"""'Fast' child watcher implementation.
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This implementation reaps every terminated processes by calling
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os.waitpid(-1) directly, possibly breaking other code spawning processes
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and waiting for their termination.
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There is no noticeable overhead when handling a big number of children
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(O(1) each time a child terminates).
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"""
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def __init__(self, loop):
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super().__init__(loop)
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self._lock = threading.Lock()
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self._zombies = {}
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self._forks = 0
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def close(self):
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super().close()
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self._zombies.clear()
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def __enter__(self):
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with self._lock:
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self._forks += 1
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return self
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def __exit__(self, a, b, c):
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with self._lock:
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self._forks -= 1
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if self._forks or not self._zombies:
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return
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collateral_victims = str(self._zombies)
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self._zombies.clear()
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logger.warning(
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"Caught subprocesses termination from unknown pids: %s",
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collateral_victims)
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def add_child_handler(self, pid, callback, *args):
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assert self._forks, "Must use the context manager"
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self._callbacks[pid] = callback, args
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try:
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# Ensure that the child is not already terminated.
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# (raise KeyError if still alive)
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returncode = self._zombies.pop(pid)
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# Child is dead, therefore we can fire the callback immediately.
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# First we remove it from the dict.
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# (raise KeyError if .remove_child_handler() was called in-between)
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del self._callbacks[pid]
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except KeyError:
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pass
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else:
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callback(pid, returncode, *args)
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def _do_waitpid_all(self):
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# Because of signal coalescing, we must keep calling waitpid() as
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# long as we're able to reap a child.
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while True:
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try:
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pid, status = os.waitpid(-1, os.WNOHANG)
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except ChildProcessError:
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# No more child processes exist.
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return
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else:
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if pid == 0:
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# A child process is still alive.
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return
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returncode = self._compute_returncode(status)
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try:
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callback, args = self._callbacks.pop(pid)
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except KeyError:
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# unknown child
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with self._lock:
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if self._forks:
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# It may not be registered yet.
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self._zombies[pid] = returncode
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continue
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logger.warning(
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"Caught subprocess termination from unknown pid: "
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"%d -> %d", pid, returncode)
|
||||
else:
|
||||
callback(pid, returncode, *args)
|
||||
|
||||
|
||||
class _UnixDefaultEventLoopPolicy(events.BaseDefaultEventLoopPolicy):
|
||||
"""XXX"""
|
||||
_loop_factory = _UnixSelectorEventLoop
|
||||
|
||||
def __init__(self):
|
||||
super().__init__()
|
||||
self._watcher = None
|
||||
|
||||
def _init_watcher(self):
|
||||
with events._lock:
|
||||
if self._watcher is None: # pragma: no branch
|
||||
if isinstance(threading.current_thread(),
|
||||
threading._MainThread):
|
||||
self._watcher = SafeChildWatcher(self._local._loop)
|
||||
else:
|
||||
self._watcher = SafeChildWatcher(None)
|
||||
|
||||
def set_event_loop(self, loop):
|
||||
"""Set 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 .set_loop(loop) on the
|
||||
child watcher.
|
||||
"""
|
||||
|
||||
super().set_event_loop(loop)
|
||||
|
||||
if self._watcher is not None and \
|
||||
isinstance(threading.current_thread(), threading._MainThread):
|
||||
self._watcher.set_loop(loop)
|
||||
|
||||
def get_child_watcher(self):
|
||||
"""Get the child watcher
|
||||
|
||||
If not yet set, a SafeChildWatcher object is automatically created.
|
||||
"""
|
||||
if self._watcher is None:
|
||||
self._init_watcher()
|
||||
|
||||
return self._watcher
|
||||
|
||||
def set_child_watcher(self, watcher):
|
||||
"""Set the child watcher"""
|
||||
|
||||
assert watcher is None or isinstance(watcher, AbstractChildWatcher)
|
||||
|
||||
if self._watcher is not None:
|
||||
self._watcher.close()
|
||||
|
||||
self._watcher = watcher
|
||||
|
||||
SelectorEventLoop = _UnixSelectorEventLoop
|
||||
DefaultEventLoopPolicy = _UnixDefaultEventLoopPolicy
|
||||
|
|
|
|||
|
|
@ -7,6 +7,7 @@
|
|||
import struct
|
||||
import _winapi
|
||||
|
||||
from . import events
|
||||
from . import base_subprocess
|
||||
from . import futures
|
||||
from . import proactor_events
|
||||
|
|
@ -17,7 +18,9 @@
|
|||
from . import _overlapped
|
||||
|
||||
|
||||
__all__ = ['SelectorEventLoop', 'ProactorEventLoop', 'IocpProactor']
|
||||
__all__ = ['SelectorEventLoop', 'ProactorEventLoop', 'IocpProactor',
|
||||
'DefaultEventLoopPolicy',
|
||||
]
|
||||
|
||||
|
||||
NULL = 0
|
||||
|
|
@ -108,7 +111,7 @@ def close(self):
|
|||
__del__ = close
|
||||
|
||||
|
||||
class SelectorEventLoop(selector_events.BaseSelectorEventLoop):
|
||||
class _WindowsSelectorEventLoop(selector_events.BaseSelectorEventLoop):
|
||||
"""Windows version of selector event loop."""
|
||||
|
||||
def _socketpair(self):
|
||||
|
|
@ -453,3 +456,13 @@ def callback(f):
|
|||
|
||||
f = self._loop._proactor.wait_for_handle(int(self._proc._handle))
|
||||
f.add_done_callback(callback)
|
||||
|
||||
|
||||
SelectorEventLoop = _WindowsSelectorEventLoop
|
||||
|
||||
|
||||
class _WindowsDefaultEventLoopPolicy(events.BaseDefaultEventLoopPolicy):
|
||||
_loop_factory = SelectorEventLoop
|
||||
|
||||
|
||||
DefaultEventLoopPolicy = _WindowsDefaultEventLoopPolicy
|
||||
|
|
|
|||
|
|
@ -1308,8 +1308,17 @@ def test_create_datagram_endpoint(self):
|
|||
from asyncio import selectors
|
||||
from asyncio import unix_events
|
||||
|
||||
class UnixEventLoopTestsMixin(EventLoopTestsMixin):
|
||||
def setUp(self):
|
||||
super().setUp()
|
||||
events.set_child_watcher(unix_events.SafeChildWatcher(self.loop))
|
||||
|
||||
def tearDown(self):
|
||||
events.set_child_watcher(None)
|
||||
super().tearDown()
|
||||
|
||||
if hasattr(selectors, 'KqueueSelector'):
|
||||
class KqueueEventLoopTests(EventLoopTestsMixin,
|
||||
class KqueueEventLoopTests(UnixEventLoopTestsMixin,
|
||||
SubprocessTestsMixin,
|
||||
unittest.TestCase):
|
||||
|
||||
|
|
@ -1318,7 +1327,7 @@ def create_event_loop(self):
|
|||
selectors.KqueueSelector())
|
||||
|
||||
if hasattr(selectors, 'EpollSelector'):
|
||||
class EPollEventLoopTests(EventLoopTestsMixin,
|
||||
class EPollEventLoopTests(UnixEventLoopTestsMixin,
|
||||
SubprocessTestsMixin,
|
||||
unittest.TestCase):
|
||||
|
||||
|
|
@ -1326,7 +1335,7 @@ def create_event_loop(self):
|
|||
return unix_events.SelectorEventLoop(selectors.EpollSelector())
|
||||
|
||||
if hasattr(selectors, 'PollSelector'):
|
||||
class PollEventLoopTests(EventLoopTestsMixin,
|
||||
class PollEventLoopTests(UnixEventLoopTestsMixin,
|
||||
SubprocessTestsMixin,
|
||||
unittest.TestCase):
|
||||
|
||||
|
|
@ -1334,7 +1343,7 @@ def create_event_loop(self):
|
|||
return unix_events.SelectorEventLoop(selectors.PollSelector())
|
||||
|
||||
# Should always exist.
|
||||
class SelectEventLoopTests(EventLoopTestsMixin,
|
||||
class SelectEventLoopTests(UnixEventLoopTestsMixin,
|
||||
SubprocessTestsMixin,
|
||||
unittest.TestCase):
|
||||
|
||||
|
|
@ -1557,25 +1566,36 @@ def test_empty(self):
|
|||
|
||||
class PolicyTests(unittest.TestCase):
|
||||
|
||||
def create_policy(self):
|
||||
if sys.platform == "win32":
|
||||
from asyncio import windows_events
|
||||
return windows_events.DefaultEventLoopPolicy()
|
||||
else:
|
||||
from asyncio import unix_events
|
||||
return unix_events.DefaultEventLoopPolicy()
|
||||
|
||||
def test_event_loop_policy(self):
|
||||
policy = events.AbstractEventLoopPolicy()
|
||||
self.assertRaises(NotImplementedError, policy.get_event_loop)
|
||||
self.assertRaises(NotImplementedError, policy.set_event_loop, object())
|
||||
self.assertRaises(NotImplementedError, policy.new_event_loop)
|
||||
self.assertRaises(NotImplementedError, policy.get_child_watcher)
|
||||
self.assertRaises(NotImplementedError, policy.set_child_watcher,
|
||||
object())
|
||||
|
||||
def test_get_event_loop(self):
|
||||
policy = events.DefaultEventLoopPolicy()
|
||||
self.assertIsNone(policy._loop)
|
||||
policy = self.create_policy()
|
||||
self.assertIsNone(policy._local._loop)
|
||||
|
||||
loop = policy.get_event_loop()
|
||||
self.assertIsInstance(loop, events.AbstractEventLoop)
|
||||
|
||||
self.assertIs(policy._loop, loop)
|
||||
self.assertIs(policy._local._loop, loop)
|
||||
self.assertIs(loop, policy.get_event_loop())
|
||||
loop.close()
|
||||
|
||||
def test_get_event_loop_after_set_none(self):
|
||||
policy = events.DefaultEventLoopPolicy()
|
||||
policy = self.create_policy()
|
||||
policy.set_event_loop(None)
|
||||
self.assertRaises(AssertionError, policy.get_event_loop)
|
||||
|
||||
|
|
@ -1583,7 +1603,7 @@ def test_get_event_loop_after_set_none(self):
|
|||
def test_get_event_loop_thread(self, m_current_thread):
|
||||
|
||||
def f():
|
||||
policy = events.DefaultEventLoopPolicy()
|
||||
policy = self.create_policy()
|
||||
self.assertRaises(AssertionError, policy.get_event_loop)
|
||||
|
||||
th = threading.Thread(target=f)
|
||||
|
|
@ -1591,14 +1611,14 @@ def f():
|
|||
th.join()
|
||||
|
||||
def test_new_event_loop(self):
|
||||
policy = events.DefaultEventLoopPolicy()
|
||||
policy = self.create_policy()
|
||||
|
||||
loop = policy.new_event_loop()
|
||||
self.assertIsInstance(loop, events.AbstractEventLoop)
|
||||
loop.close()
|
||||
|
||||
def test_set_event_loop(self):
|
||||
policy = events.DefaultEventLoopPolicy()
|
||||
policy = self.create_policy()
|
||||
old_loop = policy.get_event_loop()
|
||||
|
||||
self.assertRaises(AssertionError, policy.set_event_loop, object())
|
||||
|
|
@ -1621,7 +1641,7 @@ def test_set_event_loop_policy(self):
|
|||
|
||||
old_policy = events.get_event_loop_policy()
|
||||
|
||||
policy = events.DefaultEventLoopPolicy()
|
||||
policy = self.create_policy()
|
||||
events.set_event_loop_policy(policy)
|
||||
self.assertIs(policy, events.get_event_loop_policy())
|
||||
self.assertIsNot(policy, old_policy)
|
||||
|
|
|
|||
File diff suppressed because it is too large
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Reference in a new issue