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- // Copyright (C) 2001-2003
- // William E. Kempf
- //
- // Distributed under the Boost Software License, Version 1.0. (See accompanying
- // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
- #define BOOST_THREAD_VERSION 2
- #include <boost/thread/mutex.hpp>
- #include <boost/thread/condition.hpp>
- #include <boost/thread/thread_only.hpp>
- #include <boost/thread/xtime.hpp>
- #include <iostream>
- #include <time.h>
- namespace
- {
- boost::mutex iomx;
- } // namespace
- class canteen
- {
- public:
- canteen() : m_chickens(0) { }
- void get(int id)
- {
- boost::unique_lock<boost::mutex> lock(m_mutex);
- while (m_chickens == 0)
- {
- {
- boost::unique_lock<boost::mutex> lk(iomx);
- std::cout << "(" << clock() << ") Phil" << id <<
- ": wot, no chickens? I'll WAIT ..." << std::endl;
- }
- m_condition.wait(lock);
- }
- {
- boost::unique_lock<boost::mutex> lk(iomx);
- std::cout << "(" << clock() << ") Phil" << id <<
- ": those chickens look good ... one please ..." << std::endl;
- }
- m_chickens--;
- }
- void put(int value)
- {
- boost::unique_lock<boost::mutex> lock(m_mutex);
- {
- boost::unique_lock<boost::mutex> lk(iomx);
- std::cout << "(" << clock()
- << ") Chef: ouch ... make room ... this dish is "
- << "very hot ..." << std::endl;
- }
- boost::xtime xt;
- boost::xtime_get(&xt, boost::TIME_UTC_);
- xt.sec += 3;
- boost::thread::sleep(xt);
- m_chickens += value;
- {
- boost::unique_lock<boost::mutex> lk(iomx);
- std::cout << "(" << clock() <<
- ") Chef: more chickens ... " << m_chickens <<
- " now available ... NOTIFYING ..." << std::endl;
- }
- m_condition.notify_all();
- }
- private:
- boost::mutex m_mutex;
- boost::condition m_condition;
- int m_chickens;
- };
- canteen g_canteen;
- void chef()
- {
- const int chickens = 4;
- {
- boost::unique_lock<boost::mutex> lock(iomx);
- std::cout << "(" << clock() << ") Chef: starting ..." << std::endl;
- }
- for (;;)
- {
- {
- boost::unique_lock<boost::mutex> lock(iomx);
- std::cout << "(" << clock() << ") Chef: cooking ..." << std::endl;
- }
- boost::xtime xt;
- boost::xtime_get(&xt, boost::TIME_UTC_);
- xt.sec += 2;
- boost::thread::sleep(xt);
- {
- boost::unique_lock<boost::mutex> lock(iomx);
- std::cout << "(" << clock() << ") Chef: " << chickens
- << " chickens, ready-to-go ..." << std::endl;
- }
- g_canteen.put(chickens);
- }
- }
- struct phil
- {
- phil(int id) : m_id(id) { }
- void run() {
- {
- boost::unique_lock<boost::mutex> lock(iomx);
- std::cout << "(" << clock() << ") Phil" << m_id
- << ": starting ..." << std::endl;
- }
- for (;;)
- {
- if (m_id > 0)
- {
- boost::xtime xt;
- boost::xtime_get(&xt, boost::TIME_UTC_);
- xt.sec += 3;
- boost::thread::sleep(xt);
- }
- {
- boost::unique_lock<boost::mutex> lk(iomx);
- std::cout << "(" << clock() << ") Phil" << m_id
- << ": gotta eat ..." << std::endl;
- }
- g_canteen.get(m_id);
- {
- boost::unique_lock<boost::mutex> lk(iomx);
- std::cout << "(" << clock() << ") Phil" << m_id
- << ": mmm ... that's good ..." << std::endl;
- }
- }
- }
- static void do_thread(void* param) {
- static_cast<phil*>(param)->run();
- }
- int m_id;
- };
- struct thread_adapt
- {
- thread_adapt(void (*func)(void*), void* param)
- : _func(func), _param(param)
- {
- }
- int operator()() const
- {
- _func(_param);
- return 0;
- }
- void (*_func)(void*);
- void* _param;
- };
- class thread_adapter
- {
- public:
- thread_adapter(void (*func)(void*), void* param)
- : _func(func), _param(param)
- {
- }
- void operator()() const { _func(_param); }
- private:
- void (*_func)(void*);
- void* _param;
- };
- int main()
- {
- boost::thread thrd_chef(&chef);
- phil p[] = { phil(0), phil(1), phil(2), phil(3), phil(4) };
- boost::thread thrd_phil0(thread_adapter(&phil::do_thread, &p[0]));
- boost::thread thrd_phil1(thread_adapter(&phil::do_thread, &p[1]));
- boost::thread thrd_phil2(thread_adapter(&phil::do_thread, &p[2]));
- boost::thread thrd_phil3(thread_adapter(&phil::do_thread, &p[3]));
- boost::thread thrd_phil4(thread_adapter(&phil::do_thread, &p[4]));
- thrd_chef.join();
- thrd_phil0.join();
- thrd_phil1.join();
- thrd_phil2.join();
- thrd_phil3.join();
- thrd_phil4.join();
- return 0;
- }
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