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_XLOCK_WEK070601_HPP |
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8 | #define BOOST_XLOCK_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/utility.hpp> |
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13 | #include <boost/thread/exceptions.hpp> |
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14 | |
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15 | namespace boost { |
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16 | |
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17 | class condition; |
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18 | struct xtime; |
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19 | |
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20 | namespace detail { namespace thread { |
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21 | |
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22 | template <typename Mutex> |
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23 | class lock_ops : private noncopyable |
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24 | { |
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25 | private: |
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26 | lock_ops() { } |
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27 | |
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28 | public: |
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29 | typedef typename Mutex::cv_state lock_state; |
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30 | |
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31 | static void lock(Mutex& m) |
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32 | { |
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33 | m.do_lock(); |
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34 | } |
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35 | static bool trylock(Mutex& m) |
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36 | { |
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37 | return m.do_trylock(); |
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38 | } |
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39 | static bool timedlock(Mutex& m, const xtime& xt) |
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40 | { |
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41 | return m.do_timedlock(xt); |
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42 | } |
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43 | static void unlock(Mutex& m) |
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44 | { |
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45 | m.do_unlock(); |
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46 | } |
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47 | static void lock(Mutex& m, lock_state& state) |
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48 | { |
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49 | m.do_lock(state); |
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50 | } |
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51 | static void unlock(Mutex& m, lock_state& state) |
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52 | { |
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53 | m.do_unlock(state); |
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54 | } |
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55 | }; |
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56 | |
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57 | template <typename Mutex> |
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58 | class scoped_lock : private noncopyable |
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59 | { |
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60 | public: |
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61 | typedef Mutex mutex_type; |
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62 | |
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63 | explicit scoped_lock(Mutex& mx, bool initially_locked=true) |
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64 | : m_mutex(mx), m_locked(false) |
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65 | { |
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66 | if (initially_locked) lock(); |
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67 | } |
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68 | ~scoped_lock() |
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69 | { |
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70 | if (m_locked) unlock(); |
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71 | } |
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72 | |
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73 | void lock() |
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74 | { |
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75 | if (m_locked) throw lock_error(); |
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76 | lock_ops<Mutex>::lock(m_mutex); |
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77 | m_locked = true; |
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78 | } |
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79 | void unlock() |
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80 | { |
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81 | if (!m_locked) throw lock_error(); |
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82 | lock_ops<Mutex>::unlock(m_mutex); |
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83 | m_locked = false; |
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84 | } |
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85 | |
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86 | bool locked() const { return m_locked; } |
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87 | operator const void*() const { return m_locked ? this : 0; } |
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88 | |
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89 | private: |
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90 | friend class boost::condition; |
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91 | |
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92 | Mutex& m_mutex; |
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93 | bool m_locked; |
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94 | }; |
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95 | |
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96 | template <typename TryMutex> |
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97 | class scoped_try_lock : private noncopyable |
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98 | { |
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99 | public: |
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100 | typedef TryMutex mutex_type; |
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101 | |
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102 | explicit scoped_try_lock(TryMutex& mx) |
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103 | : m_mutex(mx), m_locked(false) |
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104 | { |
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105 | try_lock(); |
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106 | } |
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107 | scoped_try_lock(TryMutex& mx, bool initially_locked) |
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108 | : m_mutex(mx), m_locked(false) |
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109 | { |
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110 | if (initially_locked) lock(); |
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111 | } |
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112 | ~scoped_try_lock() |
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113 | { |
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114 | if (m_locked) unlock(); |
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115 | } |
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116 | |
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117 | void lock() |
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118 | { |
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119 | if (m_locked) throw lock_error(); |
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120 | lock_ops<TryMutex>::lock(m_mutex); |
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121 | m_locked = true; |
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122 | } |
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123 | bool try_lock() |
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124 | { |
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125 | if (m_locked) throw lock_error(); |
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126 | return (m_locked = lock_ops<TryMutex>::trylock(m_mutex)); |
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127 | } |
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128 | void unlock() |
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129 | { |
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130 | if (!m_locked) throw lock_error(); |
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131 | lock_ops<TryMutex>::unlock(m_mutex); |
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132 | m_locked = false; |
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133 | } |
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134 | |
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135 | bool locked() const { return m_locked; } |
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136 | operator const void*() const { return m_locked ? this : 0; } |
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137 | |
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138 | private: |
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139 | friend class boost::condition; |
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140 | |
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141 | TryMutex& m_mutex; |
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142 | bool m_locked; |
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143 | }; |
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144 | |
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145 | template <typename TimedMutex> |
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146 | class scoped_timed_lock : private noncopyable |
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147 | { |
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148 | public: |
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149 | typedef TimedMutex mutex_type; |
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150 | |
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151 | scoped_timed_lock(TimedMutex& mx, const xtime& xt) |
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152 | : m_mutex(mx), m_locked(false) |
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153 | { |
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154 | timed_lock(xt); |
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155 | } |
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156 | scoped_timed_lock(TimedMutex& mx, bool initially_locked) |
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157 | : m_mutex(mx), m_locked(false) |
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158 | { |
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159 | if (initially_locked) lock(); |
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160 | } |
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161 | ~scoped_timed_lock() |
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162 | { |
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163 | if (m_locked) unlock(); |
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164 | } |
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165 | |
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166 | void lock() |
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167 | { |
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168 | if (m_locked) throw lock_error(); |
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169 | lock_ops<TimedMutex>::lock(m_mutex); |
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170 | m_locked = true; |
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171 | } |
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172 | bool try_lock() |
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173 | { |
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174 | if (m_locked) throw lock_error(); |
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175 | return (m_locked = lock_ops<TimedMutex>::trylock(m_mutex)); |
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176 | } |
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177 | bool timed_lock(const xtime& xt) |
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178 | { |
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179 | if (m_locked) throw lock_error(); |
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180 | return (m_locked = lock_ops<TimedMutex>::timedlock(m_mutex, xt)); |
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181 | } |
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182 | void unlock() |
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183 | { |
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184 | if (!m_locked) throw lock_error(); |
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185 | lock_ops<TimedMutex>::unlock(m_mutex); |
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186 | m_locked = false; |
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187 | } |
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188 | |
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189 | bool locked() const { return m_locked; } |
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190 | operator const void*() const { return m_locked ? this : 0; } |
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191 | |
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192 | private: |
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193 | friend class boost::condition; |
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194 | |
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195 | TimedMutex& m_mutex; |
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196 | bool m_locked; |
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197 | }; |
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198 | |
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199 | } // namespace thread |
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200 | } // namespace detail |
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201 | } // namespace boost |
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202 | |
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203 | #endif // BOOST_XLOCK_WEK070601_HPP |
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204 | |
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205 | // Change Log: |
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206 | // 8 Feb 01 WEKEMPF Initial version. |
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207 | // 22 May 01 WEKEMPF Modified to use xtime for time outs. |
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208 | // 30 Jul 01 WEKEMPF Moved lock types into boost::detail::thread. Renamed |
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209 | // some types. Added locked() methods. |
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