Allow specifying prefix for thread name in concurrent.futures.ThreadPoolExecutor

[durin42]

BPO	27664
Nosy	@gpshead
Files	cpython.patch: Initial patch.

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2016-08-07.17:20:38.633>
created_at = <Date 2016-08-01.18:03:16.648>
labels = ['type-feature', 'library']
title = 'Allow specifying prefix for thread name in concurrent.futures.ThreadPoolExecutor'
updated_at = <Date 2016-08-07.17:20:38.631>
user = 'https://bugs.python.org/durin42'

bugs.python.org fields:

activity = <Date 2016-08-07.17:20:38.631>
actor = 'gregory.p.smith'
assignee = 'none'
closed = True
closed_date = <Date 2016-08-07.17:20:38.633>
closer = 'gregory.p.smith'
components = ['Library (Lib)']
creation = <Date 2016-08-01.18:03:16.648>
creator = 'durin42'
dependencies = []
files = ['43967']
hgrepos = []
issue_num = 27664
keywords = ['patch']
message_count = 4.0
messages = ['271790', '272125', '272126', '272127']
nosy_count = 3.0
nosy_names = ['gregory.p.smith', 'durin42', 'python-dev']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'commit review'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue27664'
versions = ['Python 3.6']

[durin42]

This is mostly useful for when you've got a large number of threads and want to try and identify what threadpool is going nuts.

[gpshead]

A workaround for this on 3.5 and older versions is probably to do:

initialization:

num_q = queue.Queue()
map(num_q.put, range(max_workers))

Then schedule max_workers identical tasks:

def task():
  threading.current_thread().name = '%s_%d' % (your_prefix, num_q.get())
  num_q.task_done()
  num_q.join()  # block so that this thread cannot take a new thread naming task until all other tasks are complete.  guaranteeing we are executed once per max_workers threads.

[python-dev]

New changeset 1002a1bdc5b1 by Gregory P. Smith in branch 'default':
Issue bpo-27664: Add to concurrent.futures.thread.ThreadPoolExecutor()
https://hg.python.org/cpython/rev/1002a1bdc5b1

[gpshead]

cleaned up a bit with documentation added and submitted. thanks. ThreadPoolExecutor threads now have a default name as well, because why not.