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annotate src/modules/thread/Channel.cpp @ 1101:025c67973ad4 minor

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Make Channels more thread-safe (I know, I know..)
author Bart van Strien <bart.bes+projects@gmail.com>
date Wed, 04 Jul 2012 20:22:54 +0200
parents a74672ba1320
children fc7143cc0818
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1 /**
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2 * Copyright (c) 2006-2012 LOVE Development Team
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3 *
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4 * This software is provided 'as-is', without any express or implied
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5 * warranty. In no event will the authors be held liable for any damages
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6 * arising from the use of this software.
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7 *
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8 * Permission is granted to anyone to use this software for any purpose,
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9 * including commercial applications, and to alter it and redistribute it
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10 * freely, subject to the following restrictions:
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11 *
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12 * 1. The origin of this software must not be misrepresented; you must not
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13 * claim that you wrote the original software. If you use this software
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14 * in a product, an acknowledgment in the product documentation would be
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15 * appreciated but is not required.
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16 * 2. Altered source versions must be plainly marked as such, and must not be
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17 * misrepresented as being the original software.
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18 * 3. This notice may not be removed or altered from any source distribution.
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19 **/
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20
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21 #include "Channel.h"
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22 #include <map>
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23 #include <string>
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24
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25 namespace love
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26 {
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27 namespace thread
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28 {
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29 static std::map<std::string, Channel*> namedChannels;
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30 static Mutex *namedChannelMutex;
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31 Channel *Channel::getChannel(const std::string &name)
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32 {
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33 if (!namedChannelMutex)
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34 namedChannelMutex = newMutex();
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35 Lock l(namedChannelMutex);
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36 if (!namedChannels.count(name))
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37 namedChannels[name] = new Channel(name);
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38 else
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39 namedChannels[name]->retain();
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40 return namedChannels[name];
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41 }
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42
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43 Channel::Channel()
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44 : named(false)
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45 {
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46 mutex = newMutex();
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47 cond = newConditional();
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48 }
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49
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50 Channel::Channel(const std::string &name)
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51 : named(true), name(name)
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52 {
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53 mutex = newMutex();
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54 cond = newConditional();
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55 }
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56
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57 Channel::~Channel()
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58 {
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59 while (!queue.empty())
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60 {
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61 queue.front()->release();
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62 queue.pop();
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63 }
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64
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65 delete mutex;
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66 delete cond;
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67 if (named)
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68 namedChannels.erase(name);
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69 }
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70
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71 void Channel::push(Variant *var)
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72 {
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73 if (!var)
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74 return;
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75 Lock l(mutex);
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76 var->retain();
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77 // Keep a reference to ourselves
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78 // if we're non-empty and named.
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79 if (named && queue.empty())
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80 retain();
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81 queue.push(var);
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82 cond->signal();
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83 }
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84
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85 Variant *Channel::pop()
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86 {
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87 Lock l(mutex);
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88 if (queue.empty())
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89 return 0;
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90
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91 Variant *var = queue.front();
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92 queue.pop();
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93
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94 // Release our reference to ourselves
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95 // if we're empty and named.
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96 if (named && queue.empty())
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97 release();
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98 return var;
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99 } // NOTE: Returns a retained Variant
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100
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101 Variant *Channel::demand()
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102 {
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103 Variant *var;
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104 while (!(var = pop()))
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105 {
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106 mutex->lock();
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107 cond->wait(mutex);
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108 mutex->unlock();
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109 }
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110 return var;
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111 }
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112
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113 Variant *Channel::peek()
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114 {
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115 Lock l(mutex);
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116 if (queue.empty())
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117 return 0;
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118
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119 Variant *var = queue.front();
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120 var->retain();
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121 return var;
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122 }
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123
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124 int Channel::count()
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125 {
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126 Lock l(mutex);
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127 return queue.size();
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128 }
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129
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130 void Channel::clear()
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131 {
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132 Lock l(mutex);
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133
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134 // We're already empty.
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135 if (queue.empty())
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136 return;
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137
1098
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138 while (!queue.empty())
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139 {
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140 queue.front()->release();
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141 queue.pop();
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142 }
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143
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144 // Once again, release our own
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145 // reference if we're named.
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146 if (named)
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147 release();
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148 }
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149
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150 void Channel::release()
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151 {
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152 if (named)
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153 namedChannelMutex->lock();
025c67973ad4 Make Channels more thread-safe (I know, I know..)
Bart van Strien <bart.bes+projects@gmail.com>
parents: 1098
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154
025c67973ad4 Make Channels more thread-safe (I know, I know..)
Bart van Strien <bart.bes+projects@gmail.com>
parents: 1098
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155 Object::release();
025c67973ad4 Make Channels more thread-safe (I know, I know..)
Bart van Strien <bart.bes+projects@gmail.com>
parents: 1098
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156
025c67973ad4 Make Channels more thread-safe (I know, I know..)
Bart van Strien <bart.bes+projects@gmail.com>
parents: 1098
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157 if (named)
025c67973ad4 Make Channels more thread-safe (I know, I know..)
Bart van Strien <bart.bes+projects@gmail.com>
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158 namedChannelMutex->unlock();
025c67973ad4 Make Channels more thread-safe (I know, I know..)
Bart van Strien <bart.bes+projects@gmail.com>
parents: 1098
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159 }
1098
a74672ba1320 Merge in channels from love-experiments
Bart van Strien <bart.bes+projects@gmail.com>
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160 } // thread
a74672ba1320 Merge in channels from love-experiments
Bart van Strien <bart.bes+projects@gmail.com>
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161 } // love