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