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svn+ssh://pythondev@svn.python.org/python/trunk ........ r67348 | benjamin.peterson | 2008-11-22 20:09:41 -0600 (Sat, 22 Nov 2008) | 1 line raise a better error ........ r67355 | georg.brandl | 2008-11-23 13:17:25 -0600 (Sun, 23 Nov 2008) | 2 lines #4392: fix parameter name. ........ r67359 | georg.brandl | 2008-11-23 15:57:30 -0600 (Sun, 23 Nov 2008) | 2 lines #4399: fix typo. ........ r67362 | gregory.p.smith | 2008-11-23 18:41:43 -0600 (Sun, 23 Nov 2008) | 2 lines Document PY_SSIZE_T_CLEAN for PyArg_ParseTuple. ........ r67364 | benjamin.peterson | 2008-11-23 19:16:29 -0600 (Sun, 23 Nov 2008) | 2 lines replace reference to debugger-hooks ........ r67365 | benjamin.peterson | 2008-11-23 22:09:03 -0600 (Sun, 23 Nov 2008) | 1 line #4396 make the parser module correctly validate the with syntax ........ r67367 | georg.brandl | 2008-11-24 10:16:07 -0600 (Mon, 24 Nov 2008) | 2 lines Fix typo. ........ r67368 | georg.brandl | 2008-11-24 13:56:47 -0600 (Mon, 24 Nov 2008) | 2 lines #4404: make clear what "path" is. ........ r67398 | benjamin.peterson | 2008-11-26 11:39:17 -0600 (Wed, 26 Nov 2008) | 1 line fix typo in sqlite3 docs ........ r67423 | jesse.noller | 2008-11-28 12:59:35 -0600 (Fri, 28 Nov 2008) | 2 lines issue4238: bsd support for cpu_count ........ r67424 | christian.heimes | 2008-11-28 13:33:33 -0600 (Fri, 28 Nov 2008) | 1 line Retain copyright of processing examples. This was requested by a Debian maintainer during packaging of the multiprocessing package for 2.4/2.5 ........ r67432 | benjamin.peterson | 2008-11-28 17:18:46 -0600 (Fri, 28 Nov 2008) | 1 line SVN format 9 is the same it seems ........ r67440 | jeremy.hylton | 2008-11-28 17:42:59 -0600 (Fri, 28 Nov 2008) | 4 lines Move definition int sval into branch of ifdef where it is used. Otherwise, you get a warning about an undefined variable. ........ r67441 | jeremy.hylton | 2008-11-28 18:09:16 -0600 (Fri, 28 Nov 2008) | 2 lines Reflow long lines. ........ r67444 | amaury.forgeotdarc | 2008-11-28 20:03:32 -0600 (Fri, 28 Nov 2008) | 2 lines Fix a small typo in docstring ........ r67445 | benjamin.peterson | 2008-11-29 21:07:33 -0600 (Sat, 29 Nov 2008) | 1 line StringIO.close() stops you from using the buffer, too ........ r67454 | benjamin.peterson | 2008-11-30 08:43:23 -0600 (Sun, 30 Nov 2008) | 1 line note the version that works ........ r67455 | martin.v.loewis | 2008-11-30 13:28:27 -0600 (Sun, 30 Nov 2008) | 1 line Issue #4365: Add crtassem.h constants to the msvcrt module. ........ r67457 | christian.heimes | 2008-11-30 15:16:28 -0600 (Sun, 30 Nov 2008) | 1 line w# requires Py_ssize_t ........ r67458 | benjamin.peterson | 2008-11-30 15:46:16 -0600 (Sun, 30 Nov 2008) | 1 line fix pyspecific extensions that were broken by Sphinx's grand renaming ........
90 lines
2 KiB
Python
90 lines
2 KiB
Python
#
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# Simple example which uses a pool of workers to carry out some tasks.
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#
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# Notice that the results will probably not come out of the output
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# queue in the same in the same order as the corresponding tasks were
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# put on the input queue. If it is important to get the results back
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# in the original order then consider using `Pool.map()` or
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# `Pool.imap()` (which will save on the amount of code needed anyway).
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#
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# Copyright (c) 2006-2008, R Oudkerk
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# All rights reserved.
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#
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import time
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import random
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from multiprocessing import Process, Queue, current_process, freeze_support
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#
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# Function run by worker processes
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#
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def worker(input, output):
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for func, args in iter(input.get, 'STOP'):
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result = calculate(func, args)
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output.put(result)
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#
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# Function used to calculate result
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#
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def calculate(func, args):
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result = func(*args)
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return '%s says that %s%s = %s' % \
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(current_process().name, func.__name__, args, result)
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#
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# Functions referenced by tasks
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#
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def mul(a, b):
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time.sleep(0.5*random.random())
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return a * b
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def plus(a, b):
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time.sleep(0.5*random.random())
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return a + b
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#
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#
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#
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def test():
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NUMBER_OF_PROCESSES = 4
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TASKS1 = [(mul, (i, 7)) for i in range(20)]
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TASKS2 = [(plus, (i, 8)) for i in range(10)]
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# Create queues
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task_queue = Queue()
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done_queue = Queue()
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# Submit tasks
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for task in TASKS1:
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task_queue.put(task)
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# Start worker processes
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for i in range(NUMBER_OF_PROCESSES):
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Process(target=worker, args=(task_queue, done_queue)).start()
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# Get and print results
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print('Unordered results:')
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for i in range(len(TASKS1)):
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print('\t', done_queue.get())
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# Add more tasks using `put()`
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for task in TASKS2:
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task_queue.put(task)
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# Get and print some more results
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for i in range(len(TASKS2)):
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print('\t', done_queue.get())
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# Tell child processes to stop
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for i in range(NUMBER_OF_PROCESSES):
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task_queue.put('STOP')
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if __name__ == '__main__':
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freeze_support()
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test()
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