1 // Copyright (C) 2011 Tim Blechmann 2 // 3 // Distributed under the Boost Software License, Version 1.0. (See 4 // accompanying file LICENSE_1_0.txt or copy at 5 // http://www.boost.org/LICENSE_1_0.txt) 6 7 #ifndef BOOST_LOCKFREE_TEST_HELPERS 8 #define BOOST_LOCKFREE_TEST_HELPERS 9 10 #include <set> 11 #include <boost/array.hpp> 12 #include <boost/lockfree/detail/atomic.hpp> 13 #include <boost/thread.hpp> 14 15 #include <boost/cstdint.hpp> 16 17 template <typename int_type> generate_id(void)18int_type generate_id(void) 19 { 20 static boost::lockfree::detail::atomic<int_type> generator(0); 21 return ++generator; 22 } 23 24 template <typename int_type, size_t buckets> 25 class static_hashed_set 26 { 27 28 public: calc_index(int_type id)29 int calc_index(int_type id) 30 { 31 // knuth hash ... does not need to be good, but has to be portable 32 size_t factor = size_t((float)buckets * 1.616f); 33 34 return ((size_t)id * factor) % buckets; 35 } 36 insert(int_type const & id)37 bool insert(int_type const & id) 38 { 39 std::size_t index = calc_index(id); 40 41 boost::lock_guard<boost::mutex> lock (ref_mutex[index]); 42 43 std::pair<typename std::set<int_type>::iterator, bool> p; 44 p = data[index].insert(id); 45 46 return p.second; 47 } 48 find(int_type const & id)49 bool find (int_type const & id) 50 { 51 std::size_t index = calc_index(id); 52 53 boost::lock_guard<boost::mutex> lock (ref_mutex[index]); 54 55 return data[index].find(id) != data[index].end(); 56 } 57 erase(int_type const & id)58 bool erase(int_type const & id) 59 { 60 std::size_t index = calc_index(id); 61 62 boost::lock_guard<boost::mutex> lock (ref_mutex[index]); 63 64 if (data[index].find(id) != data[index].end()) { 65 data[index].erase(id); 66 assert(data[index].find(id) == data[index].end()); 67 return true; 68 } 69 else 70 return false; 71 } 72 count_nodes(void) const73 std::size_t count_nodes(void) const 74 { 75 std::size_t ret = 0; 76 for (int i = 0; i != buckets; ++i) { 77 boost::lock_guard<boost::mutex> lock (ref_mutex[i]); 78 ret += data[i].size(); 79 } 80 return ret; 81 } 82 83 private: 84 boost::array<std::set<int_type>, buckets> data; 85 mutable boost::array<boost::mutex, buckets> ref_mutex; 86 }; 87 88 struct test_equal 89 { test_equaltest_equal90 test_equal(int i): 91 i(i) 92 {} 93 operator ()test_equal94 void operator()(int arg) const 95 { 96 BOOST_REQUIRE_EQUAL(arg, i); 97 } 98 99 int i; 100 }; 101 102 struct dummy_functor 103 { operator ()dummy_functor104 void operator()(int /* arg */) const 105 { 106 } 107 }; 108 109 110 #endif 111