1 | // Copyright (C) 2001-2003 |
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2 | // William E. Kempf |
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3 | // |
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4 | // Distributed under the Boost Software License, Version 1.0. (See accompanying |
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5 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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6 | |
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7 | #include <boost/thread/mutex.hpp> |
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8 | #include <boost/thread/condition.hpp> |
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9 | #include <boost/thread/thread.hpp> |
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10 | #include <boost/thread/xtime.hpp> |
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11 | #include <iostream> |
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12 | #include <time.h> |
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13 | |
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14 | namespace |
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15 | { |
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16 | boost::mutex iomx; |
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17 | } // namespace |
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18 | |
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19 | class canteen |
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20 | { |
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21 | public: |
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22 | canteen() : m_chickens(0) { } |
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23 | |
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24 | void get(int id) |
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25 | { |
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26 | boost::mutex::scoped_lock lock(m_mutex); |
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27 | while (m_chickens == 0) |
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28 | { |
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29 | { |
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30 | boost::mutex::scoped_lock lock(iomx); |
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31 | std::cout << "(" << clock() << ") Phil" << id << |
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32 | ": wot, no chickens? I'll WAIT ..." << std::endl; |
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33 | } |
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34 | m_condition.wait(lock); |
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35 | } |
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36 | { |
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37 | boost::mutex::scoped_lock lock(iomx); |
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38 | std::cout << "(" << clock() << ") Phil" << id << |
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39 | ": those chickens look good ... one please ..." << std::endl; |
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40 | } |
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41 | m_chickens--; |
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42 | } |
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43 | void put(int value) |
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44 | { |
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45 | boost::mutex::scoped_lock lock(m_mutex); |
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46 | { |
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47 | boost::mutex::scoped_lock lock(iomx); |
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48 | std::cout << "(" << clock() |
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49 | << ") Chef: ouch ... make room ... this dish is " |
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50 | << "very hot ..." << std::endl; |
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51 | } |
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52 | boost::xtime xt; |
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53 | boost::xtime_get(&xt, boost::TIME_UTC); |
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54 | xt.sec += 3; |
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55 | boost::thread::sleep(xt); |
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56 | m_chickens += value; |
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57 | { |
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58 | boost::mutex::scoped_lock lock(iomx); |
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59 | std::cout << "(" << clock() << |
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60 | ") Chef: more chickens ... " << m_chickens << |
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61 | " now available ... NOTIFYING ..." << std::endl; |
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62 | } |
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63 | m_condition.notify_all(); |
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64 | } |
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65 | |
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66 | private: |
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67 | boost::mutex m_mutex; |
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68 | boost::condition m_condition; |
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69 | int m_chickens; |
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70 | }; |
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71 | |
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72 | canteen g_canteen; |
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73 | |
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74 | void chef() |
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75 | { |
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76 | const int chickens = 4; |
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77 | { |
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78 | boost::mutex::scoped_lock lock(iomx); |
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79 | std::cout << "(" << clock() << ") Chef: starting ..." << std::endl; |
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80 | } |
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81 | for (;;) |
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82 | { |
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83 | { |
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84 | boost::mutex::scoped_lock lock(iomx); |
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85 | std::cout << "(" << clock() << ") Chef: cooking ..." << std::endl; |
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86 | } |
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87 | boost::xtime xt; |
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88 | boost::xtime_get(&xt, boost::TIME_UTC); |
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89 | xt.sec += 2; |
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90 | boost::thread::sleep(xt); |
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91 | { |
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92 | boost::mutex::scoped_lock lock(iomx); |
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93 | std::cout << "(" << clock() << ") Chef: " << chickens |
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94 | << " chickens, ready-to-go ..." << std::endl; |
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95 | } |
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96 | g_canteen.put(chickens); |
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97 | } |
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98 | } |
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99 | |
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100 | struct phil |
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101 | { |
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102 | phil(int id) : m_id(id) { } |
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103 | void run() { |
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104 | { |
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105 | boost::mutex::scoped_lock lock(iomx); |
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106 | std::cout << "(" << clock() << ") Phil" << m_id |
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107 | << ": starting ..." << std::endl; |
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108 | } |
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109 | for (;;) |
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110 | { |
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111 | if (m_id > 0) |
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112 | { |
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113 | boost::xtime xt; |
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114 | boost::xtime_get(&xt, boost::TIME_UTC); |
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115 | xt.sec += 3; |
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116 | boost::thread::sleep(xt); |
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117 | } |
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118 | { |
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119 | boost::mutex::scoped_lock lock(iomx); |
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120 | std::cout << "(" << clock() << ") Phil" << m_id |
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121 | << ": gotta eat ..." << std::endl; |
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122 | } |
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123 | g_canteen.get(m_id); |
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124 | { |
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125 | boost::mutex::scoped_lock lock(iomx); |
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126 | std::cout << "(" << clock() << ") Phil" << m_id |
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127 | << ": mmm ... that's good ..." << std::endl; |
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128 | } |
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129 | } |
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130 | } |
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131 | static void do_thread(void* param) { |
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132 | static_cast<phil*>(param)->run(); |
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133 | } |
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134 | |
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135 | int m_id; |
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136 | }; |
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137 | |
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138 | struct thread_adapt |
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139 | { |
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140 | thread_adapt(void (*func)(void*), void* param) |
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141 | : _func(func), _param(param) |
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142 | { |
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143 | } |
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144 | int operator()() const |
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145 | { |
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146 | _func(_param); |
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147 | return 0; |
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148 | } |
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149 | |
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150 | void (*_func)(void*); |
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151 | void* _param; |
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152 | }; |
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153 | |
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154 | class thread_adapter |
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155 | { |
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156 | public: |
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157 | thread_adapter(void (*func)(void*), void* param) |
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158 | : _func(func), _param(param) |
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159 | { |
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160 | } |
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161 | void operator()() const { _func(_param); } |
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162 | private: |
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163 | void (*_func)(void*); |
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164 | void* _param; |
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165 | }; |
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166 | |
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167 | int main(int argc, char* argv[]) |
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168 | { |
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169 | boost::thread thrd_chef(&chef); |
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170 | phil p[] = { phil(0), phil(1), phil(2), phil(3), phil(4) }; |
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171 | boost::thread thrd_phil0(thread_adapter(&phil::do_thread, &p[0])); |
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172 | boost::thread thrd_phil1(thread_adapter(&phil::do_thread, &p[1])); |
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173 | boost::thread thrd_phil2(thread_adapter(&phil::do_thread, &p[2])); |
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174 | boost::thread thrd_phil3(thread_adapter(&phil::do_thread, &p[3])); |
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175 | boost::thread thrd_phil4(thread_adapter(&phil::do_thread, &p[4])); |
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176 | |
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177 | thrd_chef.join(); |
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178 | thrd_phil0.join(); |
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179 | thrd_phil1.join(); |
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180 | thrd_phil2.join(); |
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181 | thrd_phil3.join(); |
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182 | thrd_phil4.join(); |
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183 | |
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184 | return 0; |
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185 | } |
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