1 | // |
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2 | // SynchronizedObject.h |
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3 | // |
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4 | // $Id: //poco/1.3/Foundation/include/Poco/SynchronizedObject.h#2 $ |
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5 | // |
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6 | // Library: Foundation |
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7 | // Package: Threading |
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8 | // Module: SynchronizedObject |
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9 | // |
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10 | // Definition of the SynchronizedObject class. |
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11 | // |
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12 | // Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH. |
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13 | // and Contributors. |
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14 | // |
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15 | // Permission is hereby granted, free of charge, to any person or organization |
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16 | // obtaining a copy of the software and accompanying documentation covered by |
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17 | // this license (the "Software") to use, reproduce, display, distribute, |
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18 | // execute, and transmit the Software, and to prepare derivative works of the |
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19 | // Software, and to permit third-parties to whom the Software is furnished to |
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20 | // do so, all subject to the following: |
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21 | // |
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22 | // The copyright notices in the Software and this entire statement, including |
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23 | // the above license grant, this restriction and the following disclaimer, |
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24 | // must be included in all copies of the Software, in whole or in part, and |
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25 | // all derivative works of the Software, unless such copies or derivative |
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26 | // works are solely in the form of machine-executable object code generated by |
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27 | // a source language processor. |
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28 | // |
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29 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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30 | // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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31 | // FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT |
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32 | // SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE |
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33 | // FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, |
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34 | // ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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35 | // DEALINGS IN THE SOFTWARE. |
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36 | // |
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37 | |
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38 | |
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39 | #ifndef Foundation_SynchronizedObject_INCLUDED |
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40 | #define Foundation_SynchronizedObject_INCLUDED |
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41 | |
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42 | |
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43 | #include "Poco/Foundation.h" |
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44 | #include "Poco/Mutex.h" |
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45 | #include "Poco/Event.h" |
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46 | |
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47 | |
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48 | namespace Poco { |
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49 | |
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50 | |
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51 | class Foundation_API SynchronizedObject |
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52 | /// This class aggregates a Mutex and an Event |
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53 | /// and can act as a base class for all objects |
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54 | /// requiring synchronization in a multithreaded |
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55 | /// scenario. |
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56 | { |
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57 | public: |
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58 | typedef Poco::ScopedLock<SynchronizedObject> ScopedLock; |
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59 | |
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60 | SynchronizedObject(); |
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61 | /// Creates the object. |
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62 | |
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63 | virtual ~SynchronizedObject(); |
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64 | /// Destroys the object. |
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65 | |
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66 | void lock() const; |
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67 | /// Locks the object. Blocks if the object |
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68 | /// is locked by another thread. |
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69 | |
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70 | bool tryLock() const; |
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71 | /// Tries to lock the object. Returns false immediately |
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72 | /// if the object is already locked by another thread |
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73 | /// Returns true if the object was successfully locked. |
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74 | |
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75 | void unlock() const; |
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76 | /// Unlocks the object so that it can be locked by |
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77 | /// other threads. |
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78 | |
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79 | void notify() const; |
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80 | /// Signals the object. |
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81 | /// Exactly only one thread waiting for the object |
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82 | /// can resume execution. |
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83 | |
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84 | void wait() const; |
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85 | /// Waits for the object to become signalled. |
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86 | |
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87 | void wait(long milliseconds) const; |
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88 | /// Waits for the object to become signalled. |
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89 | /// Throws a TimeoutException if the object |
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90 | /// does not become signalled within the specified |
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91 | /// time interval. |
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92 | |
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93 | bool tryWait(long milliseconds) const; |
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94 | /// Waits for the object to become signalled. |
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95 | /// Returns true if the object |
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96 | /// became signalled within the specified |
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97 | /// time interval, false otherwise. |
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98 | |
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99 | private: |
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100 | mutable Mutex _mutex; |
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101 | mutable Event _event; |
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102 | }; |
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103 | |
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104 | |
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105 | // |
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106 | // inlines |
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107 | // |
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108 | inline void SynchronizedObject::lock() const |
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109 | { |
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110 | _mutex.lock(); |
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111 | } |
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112 | |
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113 | |
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114 | inline bool SynchronizedObject::tryLock() const |
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115 | { |
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116 | return _mutex.tryLock(); |
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117 | } |
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118 | |
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119 | |
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120 | inline void SynchronizedObject::unlock() const |
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121 | { |
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122 | _mutex.unlock(); |
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123 | } |
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124 | |
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125 | |
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126 | inline void SynchronizedObject::notify() const |
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127 | { |
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128 | _event.set(); |
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129 | } |
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130 | |
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131 | |
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132 | inline void SynchronizedObject::wait() const |
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133 | { |
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134 | _event.wait(); |
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135 | } |
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136 | |
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137 | |
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138 | inline void SynchronizedObject::wait(long milliseconds) const |
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139 | { |
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140 | _event.wait(milliseconds); |
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141 | } |
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142 | |
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143 | |
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144 | inline bool SynchronizedObject::tryWait(long milliseconds) const |
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145 | { |
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146 | return _event.tryWait(milliseconds); |
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147 | } |
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148 | |
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149 | |
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150 | } // namespace Poco |
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151 | |
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152 | |
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153 | #endif // Foundation_SynchronizedObject_INCLUDED |
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