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9b98a6ac8f
If an exception is thrown, it is ignored. While this may hide a bug, this should only be system exceptions in boost, which is pretty unlikely. Morever, wait should be called manually before the dtor anyway. Add an error message if the dtor has to wait in case some such cases creep in so they get fixed. Coverity 182538
88 lines
2.8 KiB
C++
88 lines
2.8 KiB
C++
// Copyright (c) 2017-2018, The Monero Project
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
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// used to endorse or promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#pragma once
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#include <boost/thread/condition_variable.hpp>
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#include <boost/thread/mutex.hpp>
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#include <boost/thread/thread.hpp>
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#include <cstddef>
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#include <functional>
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#include <utility>
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#include <vector>
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#include <stdexcept>
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namespace tools
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{
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//! A global thread pool
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class threadpool
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{
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public:
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static threadpool& getInstance() {
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static threadpool instance;
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return instance;
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}
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// The waiter lets the caller know when all of its
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// tasks are completed.
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class waiter {
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boost::mutex mt;
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boost::condition_variable cv;
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int num;
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public:
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void inc();
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void dec();
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void wait(); //! Wait for a set of tasks to finish.
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waiter() : num(0){}
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~waiter();
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};
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// Submit a task to the pool. The waiter pointer may be
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// NULL if the caller doesn't care to wait for the
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// task to finish.
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void submit(waiter *waiter, std::function<void()> f);
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int get_max_concurrency();
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private:
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threadpool();
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~threadpool();
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typedef struct entry {
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waiter *wo;
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std::function<void()> f;
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} entry;
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std::deque<entry> queue;
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boost::condition_variable has_work;
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boost::mutex mutex;
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std::vector<boost::thread> threads;
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int active;
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int max;
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bool running;
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void run();
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};
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}
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