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 | #ifndef BOOST_CONDITION_WEK070601_HPP |
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8 | #define BOOST_CONDITION_WEK070601_HPP |
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9 | |
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10 | #include <boost/thread/detail/config.hpp> |
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11 | |
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12 | #include <boost/thread/exceptions.hpp> |
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13 | #include <boost/utility.hpp> |
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14 | #include <boost/thread/detail/lock.hpp> |
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15 | |
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16 | #if defined(BOOST_HAS_PTHREADS) |
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17 | # include <pthread.h> |
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18 | #elif defined(BOOST_HAS_MPTASKS) |
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19 | # include "scoped_critical_region.hpp" |
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20 | #endif |
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21 | |
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22 | namespace boost { |
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23 | |
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24 | struct xtime; |
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25 | // disable warnings about non dll import |
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26 | // see: http://www.boost.org/more/separate_compilation.html#dlls |
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27 | #ifdef BOOST_MSVC |
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28 | # pragma warning(push) |
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29 | # pragma warning(disable: 4251 4231 4660 4275) |
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30 | #endif |
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31 | |
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32 | namespace detail { |
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33 | |
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34 | class BOOST_THREAD_DECL condition_impl : private noncopyable |
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35 | { |
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36 | friend class condition; |
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37 | |
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38 | public: |
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39 | condition_impl(); |
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40 | ~condition_impl(); |
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41 | |
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42 | void notify_one(); |
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43 | void notify_all(); |
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44 | |
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45 | #if (defined(BOOST_HAS_WINTHREADS) || defined(BOOST_HAS_MPTASKS)) |
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46 | void enter_wait(); |
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47 | void do_wait(); |
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48 | bool do_timed_wait(const xtime& xt); |
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49 | #elif defined(BOOST_HAS_PTHREADS) |
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50 | void do_wait(pthread_mutex_t* pmutex); |
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51 | bool do_timed_wait(const xtime& xt, pthread_mutex_t* pmutex); |
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52 | #endif |
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53 | |
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54 | #if defined(BOOST_HAS_WINTHREADS) |
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55 | void* m_gate; |
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56 | void* m_queue; |
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57 | void* m_mutex; |
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58 | unsigned m_gone; // # threads that timed out and never made it to m_queue |
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59 | unsigned long m_blocked; // # threads blocked on the condition |
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60 | unsigned m_waiting; // # threads no longer waiting for the condition but |
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61 | // still waiting to be removed from m_queue |
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62 | #elif defined(BOOST_HAS_PTHREADS) |
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63 | pthread_cond_t m_condition; |
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64 | #elif defined(BOOST_HAS_MPTASKS) |
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65 | MPSemaphoreID m_gate; |
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66 | MPSemaphoreID m_queue; |
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67 | threads::mac::detail::scoped_critical_region m_mutex; |
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68 | threads::mac::detail::scoped_critical_region m_mutex_mutex; |
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69 | unsigned m_gone; // # threads that timed out and never made it to m_queue |
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70 | unsigned long m_blocked; // # threads blocked on the condition |
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71 | unsigned m_waiting; // # threads no longer waiting for the condition but |
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72 | // still waiting to be removed from m_queue |
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73 | #endif |
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74 | }; |
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75 | |
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76 | } // namespace detail |
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77 | |
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78 | class condition : private noncopyable |
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79 | { |
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80 | public: |
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81 | condition() { } |
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82 | ~condition() { } |
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83 | |
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84 | void notify_one() { m_impl.notify_one(); } |
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85 | void notify_all() { m_impl.notify_all(); } |
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86 | |
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87 | template <typename L> |
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88 | void wait(L& lock) |
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89 | { |
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90 | if (!lock) |
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91 | throw lock_error(); |
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92 | |
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93 | do_wait(lock.m_mutex); |
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94 | } |
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95 | |
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96 | template <typename L, typename Pr> |
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97 | void wait(L& lock, Pr pred) |
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98 | { |
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99 | if (!lock) |
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100 | throw lock_error(); |
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101 | |
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102 | while (!pred()) |
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103 | do_wait(lock.m_mutex); |
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104 | } |
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105 | |
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106 | template <typename L> |
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107 | bool timed_wait(L& lock, const xtime& xt) |
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108 | { |
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109 | if (!lock) |
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110 | throw lock_error(); |
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111 | |
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112 | return do_timed_wait(lock.m_mutex, xt); |
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113 | } |
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114 | |
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115 | template <typename L, typename Pr> |
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116 | bool timed_wait(L& lock, const xtime& xt, Pr pred) |
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117 | { |
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118 | if (!lock) |
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119 | throw lock_error(); |
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120 | |
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121 | while (!pred()) |
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122 | { |
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123 | if (!do_timed_wait(lock.m_mutex, xt)) |
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124 | return false; |
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125 | } |
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126 | |
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127 | return true; |
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128 | } |
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129 | |
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130 | private: |
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131 | detail::condition_impl m_impl; |
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132 | |
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133 | template <typename M> |
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134 | void do_wait(M& mutex) |
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135 | { |
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136 | #if (defined(BOOST_HAS_WINTHREADS) || defined(BOOST_HAS_MPTASKS)) |
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137 | m_impl.enter_wait(); |
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138 | #endif |
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139 | |
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140 | typedef detail::thread::lock_ops<M> |
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141 | #if defined(__HP_aCC) && __HP_aCC <= 33900 && !defined(BOOST_STRICT_CONFIG) |
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142 | # define lock_ops lock_ops_ // HP confuses lock_ops witht the template |
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143 | #endif |
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144 | lock_ops; |
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145 | |
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146 | typename lock_ops::lock_state state; |
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147 | lock_ops::unlock(mutex, state); |
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148 | |
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149 | #if defined(BOOST_HAS_PTHREADS) |
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150 | m_impl.do_wait(state.pmutex); |
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151 | #elif (defined(BOOST_HAS_WINTHREADS) || defined(BOOST_HAS_MPTASKS)) |
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152 | m_impl.do_wait(); |
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153 | #endif |
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154 | |
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155 | lock_ops::lock(mutex, state); |
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156 | #undef lock_ops |
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157 | } |
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158 | |
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159 | template <typename M> |
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160 | bool do_timed_wait(M& mutex, const xtime& xt) |
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161 | { |
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162 | #if (defined(BOOST_HAS_WINTHREADS) || defined(BOOST_HAS_MPTASKS)) |
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163 | m_impl.enter_wait(); |
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164 | #endif |
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165 | |
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166 | typedef detail::thread::lock_ops<M> |
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167 | #if defined(__HP_aCC) && __HP_aCC <= 33900 && !defined(BOOST_STRICT_CONFIG) |
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168 | # define lock_ops lock_ops_ // HP confuses lock_ops witht the template |
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169 | #endif |
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170 | lock_ops; |
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171 | |
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172 | typename lock_ops::lock_state state; |
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173 | lock_ops::unlock(mutex, state); |
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174 | |
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175 | bool ret = false; |
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176 | |
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177 | #if defined(BOOST_HAS_PTHREADS) |
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178 | ret = m_impl.do_timed_wait(xt, state.pmutex); |
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179 | #elif (defined(BOOST_HAS_WINTHREADS) || defined(BOOST_HAS_MPTASKS)) |
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180 | ret = m_impl.do_timed_wait(xt); |
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181 | #endif |
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182 | |
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183 | lock_ops::lock(mutex, state); |
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184 | #undef lock_ops |
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185 | |
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186 | return ret; |
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187 | } |
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188 | }; |
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189 | #ifdef BOOST_MSVC |
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190 | # pragma warning(pop) |
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191 | #endif |
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192 | } // namespace boost |
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193 | |
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194 | // Change Log: |
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195 | // 8 Feb 01 WEKEMPF Initial version. |
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196 | // 22 May 01 WEKEMPF Modified to use xtime for time outs. |
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197 | // 23 May 01 WEKEMPF Removed "duration" timed_waits, as they are too |
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198 | // difficult to use with spurious wakeups. |
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199 | // 3 Jan 03 WEKEMPF Modified for DLL implementation. |
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200 | |
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201 | #endif // BOOST_CONDITION_WEK070601_HPP |
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