# Copyright 2009 Brian Quinlan. All Rights Reserved.

# Licensed to PSF under a Contributor Agreement.

"""Implements ProcessPoolExecutor.

The follow diagram and text describe the data-flow through the system:

|======================= In-process =====================|== Out-of-process ==|

+----------+     +----------+       +--------+     +-----------+    +---------+

|          |  => | Work Ids |    => |        |  => | Call Q    | => |         |

|          |     +----------+       |        |     +-----------+    |         |

|          |     | ...      |       |        |     | ...       |    |         |

|          |     | 6        |       |        |     | 5, call() |    |         |

|          |     | 7        |       |        |     | ...       |    |         |

| Process  |     | ...      |       | Local  |     +-----------+    | Process |

|  Pool    |     +----------+       | Worker |                      |  #1..n  |

| Executor |                        | Thread |                      |         |

|          |     +----------- +     |        |     +-----------+    |         |

|          | <=> | Work Items | <=> |        | <=  | Result Q  | <= |         |

|          |     +------------+     |        |     +-----------+    |         |

|          |     | 6: call()  |     |        |     | ...       |    |         |

|          |     |    future  |     |        |     | 4, result |    |         |

|          |     | ...        |     |        |     | 3, except |    |         |

+----------+     +------------+     +--------+     +-----------+    +---------+

Executor.submit() called:

- creates a uniquely numbered _WorkItem and adds it to the "Work Items" dict

- adds the id of the _WorkItem to the "Work Ids" queue

Local worker thread:

- reads work ids from the "Work Ids" queue and looks up the corresponding

  WorkItem from the "Work Items" dict: if the work item has been cancelled then

  it is simply removed from the dict, otherwise it is repackaged as a

  _CallItem and put in the "Call Q". New _CallItems are put in the "Call Q"

  until "Call Q" is full. NOTE: the size of the "Call Q" is kept small because

  calls placed in the "Call Q" can no longer be cancelled with Future.cancel().

- reads _ResultItems from "Result Q", updates the future stored in the

  "Work Items" dict and deletes the dict entry

Process #1..n:

- reads _CallItems from "Call Q", executes the calls, and puts the resulting

  _ResultItems in "Request Q"

"""

import atexit

from concurrent.futures import _base

import Queue as queue

import multiprocessing

import threading

import weakref

import sys

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

# Workers are created as daemon threads and processes. This is done to allow the

# interpreter to exit when there are still idle processes in a

# ProcessPoolExecutor's process 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 interpretor 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/processes finish.

_threads_queues = weakref.WeakKeyDictionary()

_shutdown = False

def _python_exit():

    global _shutdown

    _shutdown = True

    items = list(_threads_queues.items()) if _threads_queues else ()

    for t, q in items:

        q.put(None)

    for t, q in items:

        t.join(sys.maxint)

# Controls how many more calls than processes will be queued in the call queue.

# A smaller number will mean that processes spend more time idle waiting for

# work while a larger number will make Future.cancel() succeed less frequently

# (Futures in the call queue cannot be cancelled).

EXTRA_QUEUED_CALLS = 1

class _WorkItem(object):

    def __init__(self, future, fn, args, kwargs):

        self.future = future

        self.fn = fn

        self.args = args

        self.kwargs = kwargs

class _ResultItem(object):

    def __init__(self, work_id, exception=None, result=None):

        self.work_id = work_id

        self.exception = exception

        self.result = result

class _CallItem(object):

    def __init__(self, work_id, fn, args, kwargs):

        self.work_id = work_id

        self.fn = fn

        self.args = args

        self.kwargs = kwargs

def _process_worker(call_queue, result_queue):

    """Evaluates calls from call_queue and places the results in result_queue.

    This worker is run in a separate process.

    Args:

        call_queue: A multiprocessing.Queue of _CallItems that will be read and

            evaluated by the worker.

        result_queue: A multiprocessing.Queue of _ResultItems that will written

            to by the worker.

        shutdown: A multiprocessing.Event that will be set as a signal to the

            worker that it should exit when call_queue is empty.

    """

    while True:

        call_item = call_queue.get(block=True)

        if call_item is None:

            # Wake up queue management thread

            result_queue.put(None)

            return

        try:

            r = call_item.fn(*call_item.args, **call_item.kwargs)

        except:

            e = sys.exc_info()[1]

            result_queue.put(_ResultItem(call_item.work_id,

                                         exception=e))

        else:

            result_queue.put(_ResultItem(call_item.work_id,

                                         result=r))

def _add_call_item_to_queue(pending_work_items,

                            work_ids,

                            call_queue):

    """Fills call_queue with _WorkItems from pending_work_items.

    This function never blocks.

    Args:

        pending_work_items: A dict mapping work ids to _WorkItems e.g.

            {5: <_WorkItem...>, 6: <_WorkItem...>, ...}

        work_ids: A queue.Queue of work ids e.g. Queue([5, 6, ...]). Work ids

            are consumed and the corresponding _WorkItems from

            pending_work_items are transformed into _CallItems and put in

            call_queue.

        call_queue: A multiprocessing.Queue that will be filled with _CallItems

            derived from _WorkItems.

    """

    while True:

        if call_queue.full():

            return

        try:

            work_id = work_ids.get(block=False)

        except queue.Empty:

            return

        else:

            work_item = pending_work_items[work_id]

            if work_item.future.set_running_or_notify_cancel():

                call_queue.put(_CallItem(work_id,

                                         work_item.fn,

                                         work_item.args,

                                         work_item.kwargs),

                               block=True)

            else:

                del pending_work_items[work_id]

                continue

def _queue_management_worker(executor_reference,

                             processes,

                             pending_work_items,

                             work_ids_queue,

                             call_queue,

                             result_queue):

    """Manages the communication between this process and the worker processes.

    This function is run in a local thread.

    Args:

        executor_reference: A weakref.ref to the ProcessPoolExecutor that owns

            this thread. Used to determine if the ProcessPoolExecutor has been

            garbage collected and that this function can exit.

        process: A list of the multiprocessing.Process instances used as

            workers.

        pending_work_items: A dict mapping work ids to _WorkItems e.g.

            {5: <_WorkItem...>, 6: <_WorkItem...>, ...}

        work_ids_queue: A queue.Queue of work ids e.g. Queue([5, 6, ...]).

        call_queue: A multiprocessing.Queue that will be filled with _CallItems

            derived from _WorkItems for processing by the process workers.

        result_queue: A multiprocessing.Queue of _ResultItems generated by the

            process workers.

    """

    nb_shutdown_processes = [0]

    def shutdown_one_process():

        """Tell a worker to terminate, which will in turn wake us again"""

        call_queue.put(None)

        nb_shutdown_processes[0] += 1

    while True:

        _add_call_item_to_queue(pending_work_items,

                                work_ids_queue,

                                call_queue)

        result_item = result_queue.get(block=True)

        if result_item is not None:

            work_item = pending_work_items[result_item.work_id]

            del pending_work_items[result_item.work_id]

            if result_item.exception:

                work_item.future.set_exception(result_item.exception)

            else:

                work_item.future.set_result(result_item.result)

            # Delete references to object. See issue16284

            del work_item

        # Check whether we should start shutting down.

        executor = executor_reference()

        # No more work items can be added if:

        #   - The interpreter is shutting down OR

        #   - The executor that owns this worker has been collected OR

        #   - The executor that owns this worker has been shutdown.

        if _shutdown or executor is None or executor._shutdown_thread:

            # Since no new work items can be added, it is safe to shutdown

            # this thread if there are no pending work items.

            if not pending_work_items:

                while nb_shutdown_processes[0] < len(processes):

                    shutdown_one_process()

                # If .join() is not called on the created processes then

                # some multiprocessing.Queue methods may deadlock on Mac OS

                # X.

                for p in processes:

                    p.join()

                call_queue.close()

                return

        del executor

_system_limits_checked = False

_system_limited = None

def _check_system_limits():

    global _system_limits_checked, _system_limited

    if _system_limits_checked:

        if _system_limited:

            raise NotImplementedError(_system_limited)

    _system_limits_checked = True

    try:

        import os

        nsems_max = os.sysconf("SC_SEM_NSEMS_MAX")

    except (AttributeError, ValueError):

        # sysconf not available or setting not available

        return

    if nsems_max == -1:

        # indetermine limit, assume that limit is determined

        # by available memory only

        return

    if nsems_max >= 256:

        # minimum number of semaphores available

        # according to POSIX

        return

    _system_limited = "system provides too few semaphores (%d available, 256 necessary)" % nsems_max

    raise NotImplementedError(_system_limited)

class ProcessPoolExecutor(_base.Executor):

    def __init__(self, max_workers=None):

        """Initializes a new ProcessPoolExecutor instance.

        Args:

            max_workers: The maximum number of processes that can be used to

                execute the given calls. If None or not given then as many

                worker processes will be created as the machine has processors.

        """

        _check_system_limits()

        if max_workers is None:

            self._max_workers = multiprocessing.cpu_count()

        else:

            if max_workers <= 0:

                raise ValueError("max_workers must be greater than 0")

            self._max_workers = max_workers

        # Make the call queue slightly larger than the number of processes to

        # prevent the worker processes from idling. But don't make it too big

        # because futures in the call queue cannot be cancelled.

        self._call_queue = multiprocessing.Queue(self._max_workers +

                                                 EXTRA_QUEUED_CALLS)

        self._result_queue = multiprocessing.Queue()

        self._work_ids = queue.Queue()

        self._queue_management_thread = None

        self._processes = set()

        # Shutdown is a two-step process.

        self._shutdown_thread = False

        self._shutdown_lock = threading.Lock()

        self._queue_count = 0

        self._pending_work_items = {}

    def _start_queue_management_thread(self):

        # When the executor gets lost, the weakref callback will wake up

        # the queue management thread.

        def weakref_cb(_, q=self._result_queue):

            q.put(None)

        if self._queue_management_thread is None:

            self._queue_management_thread = threading.Thread(

                    target=_queue_management_worker,

                    args=(weakref.ref(self, weakref_cb),

                          self._processes,

                          self._pending_work_items,

                          self._work_ids,

                          self._call_queue,

                          self._result_queue))

            self._queue_management_thread.daemon = True

            self._queue_management_thread.start()

            _threads_queues[self._queue_management_thread] = self._result_queue

    def _adjust_process_count(self):

        for _ in range(len(self._processes), self._max_workers):

            p = multiprocessing.Process(

                    target=_process_worker,

                    args=(self._call_queue,

                          self._result_queue))

            p.start()

            self._processes.add(p)

    def submit(self, fn, *args, **kwargs):

        with self._shutdown_lock:

            if self._shutdown_thread:

                raise RuntimeError('cannot schedule new futures after shutdown')

            f = _base.Future()

            w = _WorkItem(f, fn, args, kwargs)

            self._pending_work_items[self._queue_count] = w

            self._work_ids.put(self._queue_count)

            self._queue_count += 1

            # Wake up queue management thread

            self._result_queue.put(None)

            self._start_queue_management_thread()

            self._adjust_process_count()

            return f

    submit.__doc__ = _base.Executor.submit.__doc__

    def shutdown(self, wait=True):

        with self._shutdown_lock:

            self._shutdown_thread = True

        if self._queue_management_thread:

            # Wake up queue management thread

            self._result_queue.put(None)

            if wait:

                self._queue_management_thread.join(sys.maxint)

        # To reduce the risk of openning too many files, remove references to

        # objects that use file descriptors.

        self._queue_management_thread = None

        self._call_queue = None

        self._result_queue = None

        self._processes = None

    shutdown.__doc__ = _base.Executor.shutdown.__doc__

atexit.register(_python_exit)