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# Module providing various facilities to other parts of the package # # multiprocessing/util.py # # Copyright (c) 2006-2008, R Oudkerk # Licensed to PSF under a Contributor Agreement. # import os import itertools import sys import weakref import atexit import threading # we want threading to install it's # cleanup function before multiprocessing does from subprocess import _args_from_interpreter_flags from . import process __all__ = [ 'sub_debug', 'debug', 'info', 'sub_warning', 'get_logger', 'log_to_stderr', 'get_temp_dir', 'register_after_fork', 'is_exiting', 'Finalize', 'ForkAwareThreadLock', 'ForkAwareLocal', 'close_all_fds_except', 'SUBDEBUG', 'SUBWARNING', ] # # Logging # NOTSET = 0 SUBDEBUG = 5 DEBUG = 10 INFO = 20 SUBWARNING = 25 LOGGER_NAME = 'multiprocessing' DEFAULT_LOGGING_FORMAT = '[%(levelname)s/%(processName)s] %(message)s' _logger = None _log_to_stderr = False def sub_debug(msg, *args): if _logger: _logger.log(SUBDEBUG, msg, *args) def debug(msg, *args): if _logger: _logger.log(DEBUG, msg, *args) def info(msg, *args): if _logger: _logger.log(INFO, msg, *args) def sub_warning(msg, *args): if _logger: _logger.log(SUBWARNING, msg, *args) def get_logger(): ''' Returns logger used by multiprocessing ''' global _logger import logging logging._acquireLock() try: if not _logger: _logger = logging.getLogger(LOGGER_NAME) _logger.propagate = 0 # XXX multiprocessing should cleanup before logging if hasattr(atexit, 'unregister'): atexit.unregister(_exit_function) atexit.register(_exit_function) else: atexit._exithandlers.remove((_exit_function, (), {})) atexit._exithandlers.append((_exit_function, (), {})) finally: logging._releaseLock() return _logger def log_to_stderr(level=None): ''' Turn on logging and add a handler which prints to stderr ''' global _log_to_stderr import logging logger = get_logger() formatter = logging.Formatter(DEFAULT_LOGGING_FORMAT) handler = logging.StreamHandler() handler.setFormatter(formatter) logger.addHandler(handler) if level: logger.setLevel(level) _log_to_stderr = True return _logger # # Function returning a temp directory which will be removed on exit # def _remove_temp_dir(rmtree, tempdir): rmtree(tempdir) current_process = process.current_process() # current_process() can be None if the finalizer is called # late during Python finalization if current_process is not None: current_process._config['tempdir'] = None def get_temp_dir(): # get name of a temp directory which will be automatically cleaned up tempdir = process.current_process()._config.get('tempdir') if tempdir is None: import shutil, tempfile tempdir = tempfile.mkdtemp(prefix='pymp-') info('created temp directory %s', tempdir) # keep a strong reference to shutil.rmtree(), since the finalizer # can be called late during Python shutdown Finalize(None, _remove_temp_dir, args=(shutil.rmtree, tempdir), exitpriority=-100) process.current_process()._config['tempdir'] = tempdir return tempdir # # Support for reinitialization of objects when bootstrapping a child process # _afterfork_registry = weakref.WeakValueDictionary() _afterfork_counter = itertools.count() def _run_after_forkers(): items = list(_afterfork_registry.items()) items.sort() for (index, ident, func), obj in items: try: func(obj) except Exception as e: info('after forker raised exception %s', e) def register_after_fork(obj, func): _afterfork_registry[(next(_afterfork_counter), id(obj), func)] = obj # # Finalization using weakrefs # _finalizer_registry = {} _finalizer_counter = itertools.count() class Finalize(object): ''' Class which supports object finalization using weakrefs ''' def __init__(self, obj, callback, args=(), kwargs=None, exitpriority=None): if (exitpriority is not None) and not isinstance(exitpriority,int): raise TypeError( "Exitpriority ({0!r}) must be None or int, not {1!s}".format( exitpriority, type(exitpriority))) if obj is not None: self._weakref = weakref.ref(obj, self) elif exitpriority is None: raise ValueError("Without object, exitpriority cannot be None") self._callback = callback self._args = args self._kwargs = kwargs or {} self._key = (exitpriority, next(_finalizer_counter)) self._pid = os.getpid() _finalizer_registry[self._key] = self def __call__(self, wr=None, # Need to bind these locally because the globals can have # been cleared at shutdown _finalizer_registry=_finalizer_registry, sub_debug=sub_debug, getpid=os.getpid): ''' Run the callback unless it has already been called or cancelled ''' try: del _finalizer_registry[self._key] except KeyError: sub_debug('finalizer no longer registered') else: if self._pid != getpid(): sub_debug('finalizer ignored because different process') res = None else: sub_debug('finalizer calling %s with args %s and kwargs %s', self._callback, self._args, self._kwargs) res = self._callback(*self._args, **self._kwargs) self._weakref = self._callback = self._args = \ self._kwargs = self._key = None return res def cancel(self): ''' Cancel finalization of the object ''' try: del _finalizer_registry[self._key] except KeyError: pass else: self._weakref = self._callback = self._args = \ self._kwargs = self._key = None def still_active(self): ''' Return whether this finalizer is still waiting to invoke callback ''' return self._key in _finalizer_registry def __repr__(self): try: obj = self._weakref() except (AttributeError, TypeError): obj = None if obj is None: return '<%s object, dead>' % self.__class__.__name__ x = '<%s object, callback=%s' % ( self.__class__.__name__, getattr(self._callback, '__name__', self._callback)) if self._args: x += ', args=' + str(self._args) if self._kwargs: x += ', kwargs=' + str(self._kwargs) if self._key[0] is not None: x += ', exitpriority=' + str(self._key[0]) return x + '>' def _run_finalizers(minpriority=None): ''' Run all finalizers whose exit priority is not None and at least minpriority Finalizers with highest priority are called first; finalizers with the same priority will be called in reverse order of creation. ''' if _finalizer_registry is None: # This function may be called after this module's globals are # destroyed. See the _exit_function function in this module for more # notes. return if minpriority is None: f = lambda p : p[0] is not None else: f = lambda p : p[0] is not None and p[0] >= minpriority # Careful: _finalizer_registry may be mutated while this function # is running (either by a GC run or by another thread). # list(_finalizer_registry) should be atomic, while # list(_finalizer_registry.items()) is not. keys = [key for key in list(_finalizer_registry) if f(key)] keys.sort(reverse=True) for key in keys: finalizer = _finalizer_registry.get(key) # key may have been removed from the registry if finalizer is not None: sub_debug('calling %s', finalizer) try: finalizer() except Exception: import traceback traceback.print_exc() if minpriority is None: _finalizer_registry.clear() # # Clean up on exit # def is_exiting(): ''' Returns true if the process is shutting down ''' return _exiting or _exiting is None _exiting = False def _exit_function(info=info, debug=debug, _run_finalizers=_run_finalizers, active_children=process.active_children, current_process=process.current_process): # We hold on to references to functions in the arglist due to the # situation described below, where this function is called after this # module's globals are destroyed. global _exiting if not _exiting: _exiting = True info('process shutting down') debug('running all "atexit" finalizers with priority >= 0') _run_finalizers(0) if current_process() is not None: # We check if the current process is None here because if # it's None, any call to ``active_children()`` will raise # an AttributeError (active_children winds up trying to # get attributes from util._current_process). One # situation where this can happen is if someone has # manipulated sys.modules, causing this module to be # garbage collected. The destructor for the module type # then replaces all values in the module dict with None. # For instance, after setuptools runs a test it replaces # sys.modules with a copy created earlier. See issues # #9775 and #15881. Also related: #4106, #9205, and # #9207. for p in active_children(): if p.daemon: info('calling terminate() for daemon %s', p.name) p._popen.terminate() for p in active_children(): info('calling join() for process %s', p.name) p.join() debug('running the remaining "atexit" finalizers') _run_finalizers() atexit.register(_exit_function) # # Some fork aware types # class ForkAwareThreadLock(object): def __init__(self): self._reset() register_after_fork(self, ForkAwareThreadLock._reset) def _reset(self): self._lock = threading.Lock() self.acquire = self._lock.acquire self.release = self._lock.release def __enter__(self): return self._lock.__enter__() def __exit__(self, *args): return self._lock.__exit__(*args) class ForkAwareLocal(threading.local): def __init__(self): register_after_fork(self, lambda obj : obj.__dict__.clear()) def __reduce__(self): return type(self), () # # Close fds except those specified # try: MAXFD = os.sysconf("SC_OPEN_MAX") except Exception: MAXFD = 256 def close_all_fds_except(fds): fds = list(fds) + [-1, MAXFD] fds.sort() assert fds[-1] == MAXFD, 'fd too large' for i in range(len(fds) - 1): os.closerange(fds[i]+1, fds[i+1]) # # Close sys.stdin and replace stdin with os.devnull # def _close_stdin(): if sys.stdin is None: return try: sys.stdin.close() except (OSError, ValueError): pass try: fd = os.open(os.devnull, os.O_RDONLY) try: sys.stdin = open(fd, closefd=False) except: os.close(fd) raise except (OSError, ValueError): pass # # Flush standard streams, if any # def _flush_std_streams(): try: sys.stdout.flush() except (AttributeError, ValueError): pass try: sys.stderr.flush() except (AttributeError, ValueError): pass # # Start a program with only specified fds kept open # def spawnv_passfds(path, args, passfds): import _posixsubprocess passfds = tuple(sorted(map(int, passfds))) errpipe_read, errpipe_write = os.pipe() try: return _posixsubprocess.fork_exec( args, [os.fsencode(path)], True, passfds, None, None, -1, -1, -1, -1, -1, -1, errpipe_read, errpipe_write, False, False, None) finally: os.close(errpipe_read) os.close(errpipe_write) def close_fds(*fds): """Close each file descriptor given as an argument""" for fd in fds: os.close(fd) def _cleanup_tests(): """Cleanup multiprocessing resources when multiprocessing tests completed.""" from test import support # cleanup multiprocessing process._cleanup() # Stop the ForkServer process if it's running from multiprocessing import forkserver forkserver._forkserver._stop() # Stop the ResourceTracker process if it's running from multiprocessing import resource_tracker resource_tracker._resource_tracker._stop() # bpo-37421: Explicitly call _run_finalizers() to remove immediately # temporary directories created by multiprocessing.util.get_temp_dir(). _run_finalizers() support.gc_collect() support.reap_children()