python-3.6.zip added from Github

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third_party/python/Lib/multiprocessing/util.py

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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 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)
+        Finalize(None, shutil.rmtree, args=[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):
+        assert exitpriority is None or type(exitpriority) is int
+
+        if obj is not None:
+            self._weakref = weakref.ref(obj, self)
+        else:
+            assert exitpriority is not 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 += ', exitprority=' + 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)