| 1 | // Copyright (C) 2014 Vicente Botet |
|---|---|
| 2 | // |
| 3 | // Distributed under the Boost Software License, Version 1.0. (See accompanying |
| 4 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| 5 | |
| 6 | #define BOOST_THREAD_VERSION 4 |
| 7 | |
| 8 | #include <boost/thread/shared_mutex.hpp> |
| 9 | #include <thread> |
| 10 | #include <mutex> |
| 11 | #include <shared_mutex> |
| 12 | #include <atomic> |
| 13 | #include <vector> |
| 14 | |
| 15 | using MutexT = boost::shared_mutex; |
| 16 | using ReaderLockT = std::lock_guard<MutexT>; |
| 17 | using WriterLockT = std::shared_lock<MutexT>; |
| 18 | |
| 19 | MutexT gMutex; |
| 20 | std::atomic<bool> running(true); |
| 21 | |
| 22 | |
| 23 | void myread() |
| 24 | { |
| 25 | long reads = 0; |
| 26 | while (running && reads < 100000) |
| 27 | { |
| 28 | ReaderLockT lock(gMutex); |
| 29 | std::this_thread::yield(); |
| 30 | ++reads; |
| 31 | } |
| 32 | } |
| 33 | |
| 34 | int main() |
| 35 | { |
| 36 | using namespace std; |
| 37 | |
| 38 | vector<thread> threads; |
| 39 | for (int i = 0; i < 256; ++i) |
| 40 | { |
| 41 | threads.emplace_back(args: thread(myread)); |
| 42 | } |
| 43 | |
| 44 | // string str; |
| 45 | // |
| 46 | // getline(std::cin, str); |
| 47 | running = false; |
| 48 | |
| 49 | for (auto& thread : threads) |
| 50 | { |
| 51 | thread.join(); |
| 52 | } |
| 53 | |
| 54 | return 0; |
| 55 | } |
| 56 | |
| 57 |