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Simple thread pool for Ruby
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| class ThreadPool | |
| def initialize(n) | |
| @n = n | |
| @queue = Thread::SizedQueue.new(@n) | |
| @workers = [] | |
| end | |
| def shutdown | |
| @queue.close | |
| errors = [] | |
| @workers.each do |worker| | |
| worker.join | |
| rescue => e | |
| errors << e | |
| end | |
| raise errors.first unless errors.blank? | |
| end | |
| def post(&task) | |
| return false if @queue.closed? | |
| boot_worker | |
| @queue.push(task) | |
| return true | |
| end | |
| private def boot_worker | |
| return if @workers.size >= @n | |
| @workers << Thread.new { run_worker } | |
| end | |
| private def run_worker | |
| while task = @queue.pop | |
| begin | |
| task.call | |
| rescue | |
| @queue.clear | |
| @queue.close | |
| raise | |
| end | |
| end | |
| end | |
| end |
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| require_relative './01_thread_pool' | |
| require 'logger' | |
| logger = Logger.new($stdout) | |
| logger.info '> starting...' | |
| thread_pool = ThreadPool.new(5) | |
| 30.times.each do |i| | |
| logger.info "> queue size: #{thread_pool.size}: `#{i}` pushing..." | |
| thread_pool.post do | |
| sleep 1 | |
| logger.info i | |
| sleep 1 | |
| end | |
| logger.info "> queue size: #{thread_pool.size}: `#{i}` pushed" | |
| end | |
| logger.info '> stopping...' | |
| thread_pool.shutdown | |
| logger.info '> stopped!' | |
| =begin | |
| I, [2024-04-19T09:23:00.742595 #23681] INFO -- : > starting... | |
| I, [2024-04-19T09:23:00.742966 #23681] INFO -- : > queue size: 0: `0` pushing... | |
| I, [2024-04-19T09:23:00.743175 #23681] INFO -- : > queue size: 1: `0` pushed | |
| I, [2024-04-19T09:23:00.743225 #23681] INFO -- : > queue size: 0: `1` pushing... | |
| I, [2024-04-19T09:23:00.743243 #23681] INFO -- : > queue size: 1: `1` pushed | |
| I, [2024-04-19T09:23:00.743249 #23681] INFO -- : > queue size: 1: `2` pushing... | |
| I, [2024-04-19T09:23:00.743261 #23681] INFO -- : > queue size: 2: `2` pushed | |
| I, [2024-04-19T09:23:00.743273 #23681] INFO -- : > queue size: 2: `3` pushing... | |
| I, [2024-04-19T09:23:00.743309 #23681] INFO -- : > queue size: 1: `3` pushed | |
| I, [2024-04-19T09:23:00.743341 #23681] INFO -- : > queue size: 0: `4` pushing... | |
| I, [2024-04-19T09:23:00.743353 #23681] INFO -- : > queue size: 1: `4` pushed | |
| I, [2024-04-19T09:23:00.743361 #23681] INFO -- : > queue size: 1: `5` pushing... | |
| I, [2024-04-19T09:23:00.743366 #23681] INFO -- : > queue size: 2: `5` pushed | |
| I, [2024-04-19T09:23:00.743381 #23681] INFO -- : > queue size: 2: `6` pushing... | |
| I, [2024-04-19T09:23:00.743385 #23681] INFO -- : > queue size: 3: `6` pushed | |
| I, [2024-04-19T09:23:00.743388 #23681] INFO -- : > queue size: 3: `7` pushing... | |
| I, [2024-04-19T09:23:00.743404 #23681] INFO -- : > queue size: 3: `7` pushed | |
| I, [2024-04-19T09:23:00.743414 #23681] INFO -- : > queue size: 3: `8` pushing... | |
| I, [2024-04-19T09:23:00.743417 #23681] INFO -- : > queue size: 4: `8` pushed | |
| I, [2024-04-19T09:23:00.743420 #23681] INFO -- : > queue size: 4: `9` pushing... | |
| I, [2024-04-19T09:23:00.743423 #23681] INFO -- : > queue size: 5: `9` pushed | |
| I, [2024-04-19T09:23:00.743433 #23681] INFO -- : > queue size: 5: `10` pushing... | |
| I, [2024-04-19T09:23:01.744520 #23681] INFO -- : 1 | |
| I, [2024-04-19T09:23:01.744674 #23681] INFO -- : 3 | |
| I, [2024-04-19T09:23:01.746086 #23681] INFO -- : 4 | |
| I, [2024-04-19T09:23:01.747007 #23681] INFO -- : 2 | |
| I, [2024-04-19T09:23:01.747056 #23681] INFO -- : 0 | |
| I, [2024-04-19T09:23:02.745153 #23681] INFO -- : > queue size: 5: `10` pushed | |
| I, [2024-04-19T09:23:02.745261 #23681] INFO -- : > queue size: 5: `11` pushing... | |
| I, [2024-04-19T09:23:02.746270 #23681] INFO -- : > queue size: 5: `11` pushed | |
| I, [2024-04-19T09:23:02.746299 #23681] INFO -- : > queue size: 5: `12` pushing... | |
| I, [2024-04-19T09:23:02.748462 #23681] INFO -- : > queue size: 5: `12` pushed | |
| I, [2024-04-19T09:23:02.748575 #23681] INFO -- : > queue size: 4: `13` pushing... | |
| I, [2024-04-19T09:23:02.748590 #23681] INFO -- : > queue size: 5: `13` pushed | |
| I, [2024-04-19T09:23:02.748610 #23681] INFO -- : > queue size: 5: `14` pushing... | |
| I, [2024-04-19T09:23:02.749090 #23681] INFO -- : > queue size: 5: `14` pushed | |
| I, [2024-04-19T09:23:02.749123 #23681] INFO -- : > queue size: 5: `15` pushing... | |
| I, [2024-04-19T09:23:03.746487 #23681] INFO -- : 5 | |
| I, [2024-04-19T09:23:03.747447 #23681] INFO -- : 6 | |
| I, [2024-04-19T09:23:03.750669 #23681] INFO -- : 7 | |
| I, [2024-04-19T09:23:03.750797 #23681] INFO -- : 8 | |
| I, [2024-04-19T09:23:03.751055 #23681] INFO -- : 9 | |
| I, [2024-04-19T09:23:04.747847 #23681] INFO -- : > queue size: 5: `15` pushed | |
| I, [2024-04-19T09:23:04.747930 #23681] INFO -- : > queue size: 5: `16` pushing... | |
| I, [2024-04-19T09:23:04.748059 #23681] INFO -- : > queue size: 5: `16` pushed | |
| I, [2024-04-19T09:23:04.748099 #23681] INFO -- : > queue size: 5: `17` pushing... | |
| I, [2024-04-19T09:23:04.752887 #23681] INFO -- : > queue size: 5: `17` pushed | |
| I, [2024-04-19T09:23:04.752908 #23681] INFO -- : > queue size: 5: `18` pushing... | |
| I, [2024-04-19T09:23:04.753177 #23681] INFO -- : > queue size: 5: `18` pushed | |
| I, [2024-04-19T09:23:04.753252 #23681] INFO -- : > queue size: 5: `19` pushing... | |
| I, [2024-04-19T09:23:04.755807 #23681] INFO -- : > queue size: 5: `19` pushed | |
| I, [2024-04-19T09:23:04.755842 #23681] INFO -- : > queue size: 5: `20` pushing... | |
| I, [2024-04-19T09:23:05.748653 #23681] INFO -- : 10 | |
| I, [2024-04-19T09:23:05.748913 #23681] INFO -- : 11 | |
| I, [2024-04-19T09:23:05.754761 #23681] INFO -- : 12 | |
| I, [2024-04-19T09:23:05.755085 #23681] INFO -- : 13 | |
| I, [2024-04-19T09:23:05.756269 #23681] INFO -- : 14 | |
| I, [2024-04-19T09:23:06.750502 #23681] INFO -- : > queue size: 5: `20` pushed | |
| I, [2024-04-19T09:23:06.750711 #23681] INFO -- : > queue size: 5: `21` pushing... | |
| I, [2024-04-19T09:23:06.750970 #23681] INFO -- : > queue size: 5: `21` pushed | |
| I, [2024-04-19T09:23:06.751057 #23681] INFO -- : > queue size: 5: `22` pushing... | |
| I, [2024-04-19T09:23:06.756180 #23681] INFO -- : > queue size: 5: `22` pushed | |
| I, [2024-04-19T09:23:06.756282 #23681] INFO -- : > queue size: 5: `23` pushing... | |
| I, [2024-04-19T09:23:06.757186 #23681] INFO -- : > queue size: 5: `23` pushed | |
| I, [2024-04-19T09:23:06.757250 #23681] INFO -- : > queue size: 5: `24` pushing... | |
| I, [2024-04-19T09:23:06.757537 #23681] INFO -- : > queue size: 5: `24` pushed | |
| I, [2024-04-19T09:23:06.757590 #23681] INFO -- : > queue size: 5: `25` pushing... | |
| I, [2024-04-19T09:23:07.751239 #23681] INFO -- : 15 | |
| I, [2024-04-19T09:23:07.751441 #23681] INFO -- : 16 | |
| I, [2024-04-19T09:23:07.758272 #23681] INFO -- : 17 | |
| I, [2024-04-19T09:23:07.759168 #23681] INFO -- : 18 | |
| I, [2024-04-19T09:23:07.760531 #23681] INFO -- : 19 | |
| I, [2024-04-19T09:23:08.754048 #23681] INFO -- : > queue size: 5: `25` pushed | |
| I, [2024-04-19T09:23:08.754155 #23681] INFO -- : > queue size: 5: `26` pushing... | |
| I, [2024-04-19T09:23:08.755400 #23681] INFO -- : > queue size: 5: `26` pushed | |
| I, [2024-04-19T09:23:08.755455 #23681] INFO -- : > queue size: 5: `27` pushing... | |
| I, [2024-04-19T09:23:08.761295 #23681] INFO -- : > queue size: 4: `27` pushed | |
| I, [2024-04-19T09:23:08.761383 #23681] INFO -- : > queue size: 4: `28` pushing... | |
| I, [2024-04-19T09:23:08.761414 #23681] INFO -- : > queue size: 5: `28` pushed | |
| I, [2024-04-19T09:23:08.761437 #23681] INFO -- : > queue size: 5: `29` pushing... | |
| I, [2024-04-19T09:23:08.763427 #23681] INFO -- : > queue size: 5: `29` pushed | |
| I, [2024-04-19T09:23:08.763463 #23681] INFO -- : > stopping... | |
| I, [2024-04-19T09:23:09.755312 #23681] INFO -- : 20 | |
| I, [2024-04-19T09:23:09.759050 #23681] INFO -- : 21 | |
| I, [2024-04-19T09:23:09.762835 #23681] INFO -- : 22 | |
| I, [2024-04-19T09:23:09.763110 #23681] INFO -- : 23 | |
| I, [2024-04-19T09:23:09.764942 #23681] INFO -- : 24 | |
| I, [2024-04-19T09:23:11.759153 #23681] INFO -- : 25 | |
| I, [2024-04-19T09:23:11.765669 #23681] INFO -- : 27 | |
| I, [2024-04-19T09:23:11.766846 #23681] INFO -- : 28 | |
| I, [2024-04-19T09:23:11.768197 #23681] INFO -- : 26 | |
| I, [2024-04-19T09:23:11.768303 #23681] INFO -- : 29 | |
| I, [2024-04-19T09:23:12.772832 #23681] INFO -- : > stopped! | |
| =end |
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| describe ThreadPool do | |
| it 'runs tasks in parallel with the specified parallelism' do | |
| mutex = Mutex.new | |
| values = [] | |
| t0 = Time.zone.now | |
| pool = ThreadPool.new(5) | |
| 10.times do |i| | |
| pool.post do | |
| sleep 1 | |
| mutex.synchronize { values << i } | |
| end | |
| end | |
| pool.shutdown | |
| t1 = Time.zone.now | |
| expect(values).to match_array(10.times.to_a) | |
| expect((t1 - t0).floor).to eq(2) | |
| end | |
| context 'when it raised exceptions on worker threads' do | |
| it 'stops to run tasks and it raises the exception on shutdown' do | |
| mutex = Mutex.new | |
| values = [] | |
| pool = ThreadPool.new(5) | |
| 10.times do |i| | |
| posted = pool.post do | |
| if i == 4 | |
| sleep 0.5 | |
| raise StandardError, "error" | |
| else | |
| sleep 1 | |
| mutex.synchronize { values << i } | |
| end | |
| end | |
| break unless posted | |
| end | |
| expect { pool.shutdown }.to raise_error(StandardError, "error") | |
| expect(values).to match_array([0, 1, 2, 3]) | |
| end | |
| end | |
| end |
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