85 lines
2.3 KiB
C++
85 lines
2.3 KiB
C++
/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Copyright 2017 Danny Robson <danny@nerdcruft.net>
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*/
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#include "./queue.hpp"
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#include <iostream>
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using util::job::queue;
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///////////////////////////////////////////////////////////////////////////////
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queue::queue ():
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queue (std::thread::hardware_concurrency () ?: 1)
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{ ; }
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//-----------------------------------------------------------------------------
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queue::queue (unsigned thread_count):
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m_loop ([] (store &s) {
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args obj;
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while (true) {
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// acquire the work lock and see if we need to quit, continue,
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// or sleep
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std::unique_lock<std::mutex> lk (s.mutex);
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if (s.pending.empty ()) {
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s.cv.wait (lk, [&] () {
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return s.stopping.load () || !s.pending.empty ();
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});
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}
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if (s.stopping.load ())
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break;
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// extract the arguments and forward them to the functor
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obj = std::move (s.pending.front ());
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s.pending.pop_front ();
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lk.unlock ();
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s.cv.notify_one ();
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obj.function (obj);
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}
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}),
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m_threads (thread_count)
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{
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for (auto &t: m_threads)
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t = std::thread (m_loop, std::ref (m_store));
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}
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//-----------------------------------------------------------------------------
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queue::~queue ()
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{
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// tell everyone we want to quit
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{
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std::lock_guard<std::mutex> lk {m_store.mutex};
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m_store.stopping.store (true);
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}
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m_store.cv.notify_all ();
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// wait for everyone to tidy up. perhaps we'd like to use a timeout, but
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// if things deadlock then it's the users fault currently.
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std::for_each (
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std::begin (m_threads),
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std::end (m_threads),
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[] (auto &t)
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{
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t.join ();
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});
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}
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