| 1 | // Copyright (C) 2010 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 | // bm.cpp |
| 7 | |
| 8 | // g++ test.cpp -lboost_thread-mt && ./a.out |
| 9 | |
| 10 | // the ration of XXX and YYY determines |
| 11 | // if this works or deadlocks |
| 12 | int XXX = 20; |
| 13 | int YYY = 10; |
| 14 | |
| 15 | #include <boost/thread/thread_only.hpp> |
| 16 | #include <boost/thread/shared_mutex.hpp> |
| 17 | |
| 18 | //#include <unistd.h> |
| 19 | #include <iostream> |
| 20 | #include <boost/detail/lightweight_test.hpp> |
| 21 | |
| 22 | using namespace std; |
| 23 | |
| 24 | //void sleepmillis(useconds_t miliis) |
| 25 | void sleepmillis(int miliis) |
| 26 | { |
| 27 | //usleep(miliis * 1000); |
| 28 | boost::this_thread::sleep(rel_time: boost::posix_time::milliseconds(miliis)); |
| 29 | } |
| 30 | |
| 31 | void worker1(boost::shared_mutex * lk, int * x) |
| 32 | { |
| 33 | (*x)++; // 1 |
| 34 | cout << "lock b try "<< *x << endl; |
| 35 | while (1) |
| 36 | { |
| 37 | if (lk->timed_lock(relative_time: boost::posix_time::milliseconds(XXX))) break; |
| 38 | sleepmillis(miliis: YYY); |
| 39 | } |
| 40 | cout << "lock b got "<< *x << endl; |
| 41 | (*x)++; // 2 |
| 42 | lk->unlock(); |
| 43 | } |
| 44 | |
| 45 | void worker2(boost::shared_mutex * lk, int * x) |
| 46 | { |
| 47 | cout << "lock c try"<< endl; |
| 48 | lk->lock_shared(); |
| 49 | (*x)++; |
| 50 | cout << "lock c got"<< endl; |
| 51 | lk->unlock_shared(); |
| 52 | cout << "lock c unlocked"<< endl; |
| 53 | (*x)++; |
| 54 | } |
| 55 | |
| 56 | int main() |
| 57 | { |
| 58 | |
| 59 | // create |
| 60 | boost::shared_mutex* lk = new boost::shared_mutex(); |
| 61 | |
| 62 | // read lock |
| 63 | cout << "lock a"<< endl; |
| 64 | lk->lock_shared(); |
| 65 | |
| 66 | int x1 = 0; |
| 67 | boost::thread t1(boost::bind(f: worker1, a1: lk, a2: &x1)); |
| 68 | while (!x1) |
| 69 | ; |
| 70 | BOOST_TEST(x1 == 1); |
| 71 | sleepmillis(miliis: 500); |
| 72 | BOOST_TEST(x1 == 1); |
| 73 | |
| 74 | int x2 = 0; |
| 75 | boost::thread t2(boost::bind(f: worker2, a1: lk, a2: &x2)); |
| 76 | t2.join(); |
| 77 | BOOST_TEST(x2 == 2); |
| 78 | |
| 79 | lk->unlock_shared(); |
| 80 | cout << "unlock a"<< endl; |
| 81 | |
| 82 | for (int i = 0; i < 2000; i++) |
| 83 | { |
| 84 | if (x1 == 2) break; |
| 85 | sleepmillis(miliis: 10); |
| 86 | } |
| 87 | |
| 88 | BOOST_TEST(x1 == 2); |
| 89 | t1.join(); |
| 90 | delete lk; |
| 91 | |
| 92 | return 0; |
| 93 | } |
| 94 |