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124 lines
3.4 KiB
C++
124 lines
3.4 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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#include "common/threadpool.h"
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#include <cassert>
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#include <limits>
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#include <stdexcept>
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#include "cryptonote_config.h"
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#include "common/util.h"
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static __thread int depth = 0;
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namespace tools
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{
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threadpool::threadpool() : running(true), active(0) {
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boost::thread::attributes attrs;
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attrs.set_stack_size(THREAD_STACK_SIZE);
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max = tools::get_max_concurrency();
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size_t i = max;
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while(i--) {
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threads.push_back(boost::thread(attrs, boost::bind(&threadpool::run, this)));
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}
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}
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threadpool::~threadpool() {
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{
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const boost::unique_lock<boost::mutex> lock(mutex);
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running = false;
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has_work.notify_all();
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}
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for (size_t i = 0; i<threads.size(); i++) {
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threads[i].join();
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}
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}
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void threadpool::submit(waiter *obj, std::function<void()> f) {
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entry e = {obj, f};
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boost::unique_lock<boost::mutex> lock(mutex);
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if ((active == max && !queue.empty()) || depth > 0) {
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// if all available threads are already running
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// and there's work waiting, just run in current thread
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lock.unlock();
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++depth;
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f();
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--depth;
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} else {
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if (obj)
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obj->inc();
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queue.push_back(e);
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has_work.notify_one();
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}
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}
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int threadpool::get_max_concurrency() {
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return max;
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}
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void threadpool::waiter::wait() {
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boost::unique_lock<boost::mutex> lock(mt);
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while(num) cv.wait(lock);
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}
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void threadpool::waiter::inc() {
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const boost::unique_lock<boost::mutex> lock(mt);
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num++;
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}
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void threadpool::waiter::dec() {
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const boost::unique_lock<boost::mutex> lock(mt);
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num--;
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if (!num)
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cv.notify_one();
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}
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void threadpool::run() {
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boost::unique_lock<boost::mutex> lock(mutex);
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while (running) {
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entry e;
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while(queue.empty() && running)
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has_work.wait(lock);
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if (!running) break;
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active++;
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e = queue.front();
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queue.pop_front();
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lock.unlock();
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++depth;
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e.f();
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--depth;
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if (e.wo)
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e.wo->dec();
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lock.lock();
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active--;
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}
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}
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}
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