forked from premiere/premiere-libtorrent
129 lines
3.3 KiB
C++
129 lines
3.3 KiB
C++
/*
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Copyright (c) 2010, Arvid Norberg
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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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
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <functional>
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#include <atomic>
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#include <list>
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#include <thread>
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#include <mutex>
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#include <condition_variable>
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#include "test.hpp"
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#include "libtorrent/time.hpp"
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using namespace lt;
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namespace {
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void fun(std::condition_variable* s, std::mutex* m, int* waiting, int i)
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{
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std::printf("thread %d waiting\n", i);
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std::unique_lock<std::mutex> l(*m);
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*waiting += 1;
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s->wait(l);
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std::printf("thread %d done\n", i);
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}
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void increment(std::condition_variable* s, std::mutex* m, int* waiting, std::atomic<int>* c)
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{
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std::unique_lock<std::mutex> l(*m);
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*waiting += 1;
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s->wait(l);
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l.unlock();
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for (int i = 0; i < 1000000; ++i)
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++*c;
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}
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void decrement(std::condition_variable* s, std::mutex* m, int* waiting, std::atomic<int>* c)
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{
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std::unique_lock<std::mutex> l(*m);
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*waiting += 1;
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s->wait(l);
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l.unlock();
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for (int i = 0; i < 1000000; ++i)
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--*c;
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}
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} // anonymous namespace
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TORRENT_TEST(threads)
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{
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std::condition_variable cond;
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std::mutex m;
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std::vector<std::thread> threads;
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int waiting = 0;
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for (int i = 0; i < 20; ++i)
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{
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threads.emplace_back(&fun, &cond, &m, &waiting, i);
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}
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// make sure all threads are waiting on the condition_variable
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std::unique_lock<std::mutex> l(m);
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while (waiting < 20)
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{
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l.unlock();
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std::this_thread::sleep_for(lt::milliseconds(10));
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l.lock();
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}
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cond.notify_all();
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l.unlock();
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for (auto& t : threads) t.join();
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threads.clear();
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waiting = 0;
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std::atomic<int> c(0);
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for (int i = 0; i < 3; ++i)
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{
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threads.emplace_back(&increment, &cond, &m, &waiting, &c);
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threads.emplace_back(&decrement, &cond, &m, &waiting, &c);
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}
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// make sure all threads are waiting on the condition_variable
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l.lock();
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while (waiting < 6)
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{
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l.unlock();
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std::this_thread::sleep_for(lt::milliseconds(10));
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l.lock();
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}
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cond.notify_all();
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l.unlock();
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for (auto& t : threads) t.join();
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TEST_CHECK(c == 0);
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}
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