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Edit File : thread.py \| Size : 8.56 KB
# Copyright 2009 Brian Quinlan. All Rights Reserved. # Licensed to PSF under a Contributor Agreement. """Implements ThreadPoolExecutor.""" __author__ = 'Brian Quinlan (brian@sweetapp.com)' import atexit from concurrent.futures import _base import itertools import queue import threading import weakref import os # Workers are created as daemon threads. This is done to allow the interpreter # to exit when there are still idle threads in a ThreadPoolExecutor's thread # pool (i.e. shutdown() was not called). However, allowing workers to die with # the interpreter has two undesirable properties: # - The workers would still be running during interpreter shutdown, # meaning that they would fail in unpredictable ways. # - The workers could be killed while evaluating a work item, which could # be bad if the callable being evaluated has external side-effects e.g. # writing to a file. # # To work around this problem, an exit handler is installed which tells the # workers to exit when their work queues are empty and then waits until the # threads finish. _threads_queues = weakref.WeakKeyDictionary() _shutdown = False def _python_exit(): global _shutdown _shutdown = True items = list(_threads_queues.items()) for t, q in items: q.put(None) for t, q in items: t.join() atexit.register(_python_exit) class _WorkItem(object): def __init__(self, future, fn, args, kwargs): self.future = future self.fn = fn self.args = args self.kwargs = kwargs def run(self): if not self.future.set_running_or_notify_cancel(): return try: result = self.fn(self.args, self.kwargs) except BaseException as exc: self.future.set_exception(exc) # Break a reference cycle with the exception 'exc' self = None else: self.future.set_result(result) def _worker(executor_reference, work_queue, initializer, initargs): if initializer is not None: try: initializer(initargs) except BaseException: _base.LOGGER.critical('Exception in initializer:', exc_info=True) executor = executor_reference() if executor is not None: executor._initializer_failed() return try: while True: work_item = work_queue.get(block=True) if work_item is not None: work_item.run() # Delete references to object. See issue16284 del work_item # attempt to increment idle count executor = executor_reference() if executor is not None: executor._idle_semaphore.release() del executor continue executor = executor_reference() # Exit if: # - The interpreter is shutting down OR # - The executor that owns the worker has been collected OR # - The executor that owns the worker has been shutdown. if _shutdown or executor is None or executor._shutdown: # Flag the executor as shutting down as early as possible if it # is not gc-ed yet. if executor is not None: executor._shutdown = True # Notice other workers work_queue.put(None) return del executor except BaseException: _base.LOGGER.critical('Exception in worker', exc_info=True) class BrokenThreadPool(_base.BrokenExecutor): """ Raised when a worker thread in a ThreadPoolExecutor failed initializing. """ class ThreadPoolExecutor(_base.Executor): # Used to assign unique thread names when thread_name_prefix is not supplied. _counter = itertools.count().__next__ def __init__(self, max_workers=None, thread_name_prefix='', initializer=None, initargs=()): """Initializes a new ThreadPoolExecutor instance. Args: max_workers: The maximum number of threads that can be used to execute the given calls. thread_name_prefix: An optional name prefix to give our threads. initializer: A callable used to initialize worker threads. initargs: A tuple of arguments to pass to the initializer. """ if max_workers is None: # ThreadPoolExecutor is often used to: # * CPU bound task which releases GIL # * I/O bound task (which releases GIL, of course) # # We use cpu_count + 4 for both types of tasks. # But we limit it to 32 to avoid consuming surprisingly large resource # on many core machine. max_workers = min(32, (os.cpu_count() or 1) + 4) if max_workers <= 0: raise ValueError("max_workers must be greater than 0") if initializer is not None and not callable(initializer): raise TypeError("initializer must be a callable") self._max_workers = max_workers self._work_queue = queue.SimpleQueue() self._idle_semaphore = threading.Semaphore(0) self._threads = set() self._broken = False self._shutdown = False self._shutdown_lock = threading.Lock() self._thread_name_prefix = (thread_name_prefix or ("ThreadPoolExecutor-%d" % self._counter())) self._initializer = initializer self._initargs = initargs def submit(args, kwargs): if len(args) >= 2: self, fn, args = args elif not args: raise TypeError("descriptor 'submit' of 'ThreadPoolExecutor' object " "needs an argument") elif 'fn' in kwargs: fn = kwargs.pop('fn') self, *args = args import warnings warnings.warn("Passing 'fn' as keyword argument is deprecated", DeprecationWarning, stacklevel=2) else: raise TypeError('submit expected at least 1 positional argument, ' 'got %d' % (len(args)-1)) with self._shutdown_lock: if self._broken: raise BrokenThreadPool(self._broken) if self._shutdown: raise RuntimeError('cannot schedule new futures after shutdown') if _shutdown: raise RuntimeError('cannot schedule new futures after ' 'interpreter shutdown') f = _base.Future() w = _WorkItem(f, fn, args, kwargs) self._work_queue.put(w) self._adjust_thread_count() return f submit.__text_signature__ = _base.Executor.submit.__text_signature__ submit.__doc__ = _base.Executor.submit.__doc__ def _adjust_thread_count(self): # if idle threads are available, don't spin new threads if self._idle_semaphore.acquire(timeout=0): return # When the executor gets lost, the weakref callback will wake up # the worker threads. def weakref_cb(_, q=self._work_queue): q.put(None) num_threads = len(self._threads) if num_threads < self._max_workers: thread_name = '%s_%d' % (self._thread_name_prefix or self, num_threads) t = threading.Thread(name=thread_name, target=_worker, args=(weakref.ref(self, weakref_cb), self._work_queue, self._initializer, self._initargs)) t.daemon = True t.start() self._threads.add(t) _threads_queues[t] = self._work_queue def _initializer_failed(self): with self._shutdown_lock: self._broken = ('A thread initializer failed, the thread pool ' 'is not usable anymore') # Drain work queue and mark pending futures failed while True: try: work_item = self._work_queue.get_nowait() except queue.Empty: break if work_item is not None: work_item.future.set_exception(BrokenThreadPool(self._broken)) def shutdown(self, wait=True): with self._shutdown_lock: self._shutdown = True self._work_queue.put(None) if wait: for t in self._threads: t.join() shutdown.__doc__ = _base.Executor.shutdown.__doc__ Back

Edit File : thread.py | Size : 8.56 KB

# Copyright 2009 Brian Quinlan. All Rights Reserved.
# Licensed to PSF under a Contributor Agreement.

"""Implements ThreadPoolExecutor."""

__author__ = 'Brian Quinlan (brian@sweetapp.com)'

import atexit
from concurrent.futures import _base
import itertools
import queue
import threading
import weakref
import os

# Workers are created as daemon threads. This is done to allow the interpreter
# to exit when there are still idle threads in a ThreadPoolExecutor's thread
# pool (i.e. shutdown() was not called). However, allowing workers to die with
# the interpreter has two undesirable properties:
#   - The workers would still be running during interpreter shutdown,
#     meaning that they would fail in unpredictable ways.
#   - The workers could be killed while evaluating a work item, which could
#     be bad if the callable being evaluated has external side-effects e.g.
#     writing to a file.
#
# To work around this problem, an exit handler is installed which tells the
# workers to exit when their work queues are empty and then waits until the
# threads finish.

_threads_queues = weakref.WeakKeyDictionary()
_shutdown = False

def _python_exit():
    global _shutdown
    _shutdown = True
    items = list(_threads_queues.items())
    for t, q in items:
        q.put(None)
    for t, q in items:
        t.join()

atexit.register(_python_exit)

class _WorkItem(object):
    def __init__(self, future, fn, args, kwargs):
        self.future = future
        self.fn = fn
        self.args = args
        self.kwargs = kwargs

def run(self):
        if not self.future.set_running_or_notify_cancel():
            return

try:
            result = self.fn(*self.args, **self.kwargs)
        except BaseException as exc:
            self.future.set_exception(exc)
            # Break a reference cycle with the exception 'exc'
            self = None
        else:
            self.future.set_result(result)

def _worker(executor_reference, work_queue, initializer, initargs):
    if initializer is not None:
        try:
            initializer(*initargs)
        except BaseException:
            _base.LOGGER.critical('Exception in initializer:', exc_info=True)
            executor = executor_reference()
            if executor is not None:
                executor._initializer_failed()
            return
    try:
        while True:
            work_item = work_queue.get(block=True)
            if work_item is not None:
                work_item.run()
                # Delete references to object. See issue16284
                del work_item

# attempt to increment idle count
                executor = executor_reference()
                if executor is not None:
                    executor._idle_semaphore.release()
                del executor
                continue

executor = executor_reference()
            # Exit if:
            #   - The interpreter is shutting down OR
            #   - The executor that owns the worker has been collected OR
            #   - The executor that owns the worker has been shutdown.
            if _shutdown or executor is None or executor._shutdown:
                # Flag the executor as shutting down as early as possible if it
                # is not gc-ed yet.
                if executor is not None:
                    executor._shutdown = True
                # Notice other workers
                work_queue.put(None)
                return
            del executor
    except BaseException:
        _base.LOGGER.critical('Exception in worker', exc_info=True)

class BrokenThreadPool(_base.BrokenExecutor):
    """
    Raised when a worker thread in a ThreadPoolExecutor failed initializing.
    """

class ThreadPoolExecutor(_base.Executor):

# Used to assign unique thread names when thread_name_prefix is not supplied.
    _counter = itertools.count().__next__

def __init__(self, max_workers=None, thread_name_prefix='',
                 initializer=None, initargs=()):
        """Initializes a new ThreadPoolExecutor instance.

Args:
            max_workers: The maximum number of threads that can be used to
                execute the given calls.
            thread_name_prefix: An optional name prefix to give our threads.
            initializer: A callable used to initialize worker threads.
            initargs: A tuple of arguments to pass to the initializer.
        """
        if max_workers is None:
            # ThreadPoolExecutor is often used to:
            # * CPU bound task which releases GIL
            # * I/O bound task (which releases GIL, of course)
            #
            # We use cpu_count + 4 for both types of tasks.
            # But we limit it to 32 to avoid consuming surprisingly large resource
            # on many core machine.
            max_workers = min(32, (os.cpu_count() or 1) + 4)
        if max_workers <= 0:
            raise ValueError("max_workers must be greater than 0")

if initializer is not None and not callable(initializer):
            raise TypeError("initializer must be a callable")

self._max_workers = max_workers
        self._work_queue = queue.SimpleQueue()
        self._idle_semaphore = threading.Semaphore(0)
        self._threads = set()
        self._broken = False
        self._shutdown = False
        self._shutdown_lock = threading.Lock()
        self._thread_name_prefix = (thread_name_prefix or
                                    ("ThreadPoolExecutor-%d" % self._counter()))
        self._initializer = initializer
        self._initargs = initargs

def submit(*args, **kwargs):
        if len(args) >= 2:
            self, fn, *args = args
        elif not args:
            raise TypeError("descriptor 'submit' of 'ThreadPoolExecutor' object "
                            "needs an argument")
        elif 'fn' in kwargs:
            fn = kwargs.pop('fn')
            self, *args = args
            import warnings
            warnings.warn("Passing 'fn' as keyword argument is deprecated",
                          DeprecationWarning, stacklevel=2)
        else:
            raise TypeError('submit expected at least 1 positional argument, '
                            'got %d' % (len(args)-1))

with self._shutdown_lock:
            if self._broken:
                raise BrokenThreadPool(self._broken)

if self._shutdown:
                raise RuntimeError('cannot schedule new futures after shutdown')
            if _shutdown:
                raise RuntimeError('cannot schedule new futures after '
                                   'interpreter shutdown')

f = _base.Future()
            w = _WorkItem(f, fn, args, kwargs)

self._work_queue.put(w)
            self._adjust_thread_count()
            return f
    submit.__text_signature__ = _base.Executor.submit.__text_signature__
    submit.__doc__ = _base.Executor.submit.__doc__

def _adjust_thread_count(self):
        # if idle threads are available, don't spin new threads
        if self._idle_semaphore.acquire(timeout=0):
            return

# When the executor gets lost, the weakref callback will wake up
        # the worker threads.
        def weakref_cb(_, q=self._work_queue):
            q.put(None)

num_threads = len(self._threads)
        if num_threads < self._max_workers:
            thread_name = '%s_%d' % (self._thread_name_prefix or self,
                                     num_threads)
            t = threading.Thread(name=thread_name, target=_worker,
                                 args=(weakref.ref(self, weakref_cb),
                                       self._work_queue,
                                       self._initializer,
                                       self._initargs))
            t.daemon = True
            t.start()
            self._threads.add(t)
            _threads_queues[t] = self._work_queue

def _initializer_failed(self):
        with self._shutdown_lock:
            self._broken = ('A thread initializer failed, the thread pool '
                            'is not usable anymore')
            # Drain work queue and mark pending futures failed
            while True:
                try:
                    work_item = self._work_queue.get_nowait()
                except queue.Empty:
                    break
                if work_item is not None:
                    work_item.future.set_exception(BrokenThreadPool(self._broken))

def shutdown(self, wait=True):
        with self._shutdown_lock:
            self._shutdown = True
            self._work_queue.put(None)
        if wait:
            for t in self._threads:
                t.join()
    shutdown.__doc__ = _base.Executor.shutdown.__doc__

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