88 lines
2.2 KiB
C++
88 lines
2.2 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 2018 Danny Robson <danny@nerdcruft.net>
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*/
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#include "./queue.hpp"
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#include "../raii.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_tasks {
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{}, util::pool<task> {4096}
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},
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m_pending (0),
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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 (&queue::loop, this);
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}
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//-----------------------------------------------------------------------------
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queue::~queue ()
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{
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m_stopping = true;
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// raise the semaphore enough times to resume all the worker threads
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for (size_t i = 0; i < m_threads.size (); ++i)
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m_pending.release ();
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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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for (auto &t: m_threads)
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t.join ();
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}
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///////////////////////////////////////////////////////////////////////////////
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void
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queue::loop ()
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{
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while (true) {
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m_pending.acquire ();
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if (m_stopping)
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return;
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util::scoped_counter running_count (m_running);
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CHECK (!m_tasks.pending->empty ());
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auto todo = [this] () {
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auto obj = m_tasks.pending.acquire ();
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auto res = obj->front ();
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obj->pop_front ();
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return res;
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} ();
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util::scoped_function cleanup ([&, this] () {
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m_tasks.store.destroy (todo);
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});
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todo->function (*todo);
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}
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}
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