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annotate DPF-Prymula-audioplugins/dpf/distrho/extra/Runner.hpp @ 3:84e66ea83026
DPF-Prymula-audioplugins-0.231015-2
author | prymula <prymula76@outlook.com> |
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date | Mon, 16 Oct 2023 21:53:34 +0200 |
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1 /* |
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2 * DISTRHO Plugin Framework (DPF) |
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3 * Copyright (C) 2012-2022 Filipe Coelho <falktx@falktx.com> |
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4 * |
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5 * Permission to use, copy, modify, and/or distribute this software for any purpose with |
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6 * or without fee is hereby granted, provided that the above copyright notice and this |
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7 * permission notice appear in all copies. |
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8 * |
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9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD |
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10 * TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN |
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11 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
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12 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER |
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13 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN |
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14 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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15 */ |
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16 |
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17 #ifndef DISTRHO_RUNNER_HPP_INCLUDED |
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18 #define DISTRHO_RUNNER_HPP_INCLUDED |
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19 |
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20 #include "../DistrhoUtils.hpp" |
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21 |
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22 #ifndef DISTRHO_OS_WASM |
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23 # include "Thread.hpp" |
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24 #else |
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25 # include "String.hpp" |
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26 # include <emscripten/html5.h> |
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27 #endif |
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28 |
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29 START_NAMESPACE_DISTRHO |
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30 |
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31 #ifdef DISTRHO_RUNNER_INDIRECT_WASM_CALLS |
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32 long d_emscripten_set_interval(void (*)(void*), double, void*); |
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33 void d_emscripten_clear_interval(long); |
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34 #else |
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35 # define d_emscripten_set_interval emscripten_set_interval |
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36 # define d_emscripten_clear_interval emscripten_clear_interval |
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37 #endif |
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38 |
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39 // ------------------------------------------------------------------------------------------------------------------- |
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40 // Runner class |
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41 |
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42 /** |
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43 Runner class for DPF. |
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44 |
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45 This is a handy class that handles "idle" time in either background or main thread, |
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46 whichever is more suitable to the target platform. |
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47 Typically background threads on desktop platforms, main thread on web. |
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48 |
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49 A single function is expected to be implemented by subclasses, |
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50 which directly allows it to stop the runner by returning false. |
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51 |
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52 You can use it for quick operations that do not need to be handled in the main thread if possible. |
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53 The target is to spread out execution over many runs, instead of spending a lot of time on a single task. |
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54 */ |
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55 class Runner |
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56 { |
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57 protected: |
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58 /* |
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59 * Constructor. |
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60 */ |
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61 Runner(const char* const runnerName = nullptr) noexcept |
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62 #ifndef DISTRHO_OS_WASM |
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63 : fRunnerThread(this, runnerName), |
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64 fTimeInterval(0) |
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65 #else |
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66 : fRunnerName(runnerName), |
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67 fIntervalId(0) |
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68 #endif |
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69 { |
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70 } |
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71 |
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72 /* |
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73 * Destructor. |
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74 */ |
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75 virtual ~Runner() /*noexcept*/ |
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76 { |
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77 DISTRHO_SAFE_ASSERT(! isRunnerActive()); |
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78 |
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79 stopRunner(); |
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80 } |
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81 |
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82 /* |
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83 * Virtual function to be implemented by the subclass. |
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84 * Return true to keep running, false to stop execution. |
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85 */ |
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86 virtual bool run() = 0; |
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87 |
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88 /* |
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89 * Check if the runner should stop. |
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90 * To be called from inside the runner to know if a stop request has been made. |
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91 */ |
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92 bool shouldRunnerStop() const noexcept |
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93 { |
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94 #ifndef DISTRHO_OS_WASM |
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95 return fRunnerThread.shouldThreadExit(); |
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96 #else |
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97 return fIntervalId == 0; |
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98 #endif |
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99 } |
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100 |
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101 // --------------------------------------------------------------------------------------------------------------- |
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102 |
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103 public: |
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104 /* |
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105 * Check if the runner is active. |
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106 */ |
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107 bool isRunnerActive() noexcept |
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108 { |
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109 #ifndef DISTRHO_OS_WASM |
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110 return fRunnerThread.isThreadRunning(); |
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111 #else |
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112 return fIntervalId != 0; |
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113 #endif |
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114 } |
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115 |
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116 /* |
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117 * Start the thread. |
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118 */ |
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119 bool startRunner(const uint timeIntervalMilliseconds = 0) noexcept |
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120 { |
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121 #ifndef DISTRHO_OS_WASM |
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122 DISTRHO_SAFE_ASSERT_RETURN(!fRunnerThread.isThreadRunning(), false); |
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123 fTimeInterval = timeIntervalMilliseconds; |
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124 return fRunnerThread.startThread(); |
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125 #else |
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126 DISTRHO_SAFE_ASSERT_RETURN(fIntervalId == 0, false); |
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127 fIntervalId = d_emscripten_set_interval(_entryPoint, timeIntervalMilliseconds, this); |
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128 return true; |
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129 #endif |
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130 } |
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131 |
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132 /* |
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133 * Stop the runner. |
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134 * This will signal the runner to stop if active, and wait until it finishes. |
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135 */ |
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136 bool stopRunner() noexcept |
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137 { |
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138 #ifndef DISTRHO_OS_WASM |
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139 return fRunnerThread.stopThread(-1); |
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140 #else |
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141 signalRunnerShouldStop(); |
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142 return true; |
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143 #endif |
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144 } |
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145 |
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146 /* |
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147 * Tell the runner to stop as soon as possible. |
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148 */ |
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149 void signalRunnerShouldStop() noexcept |
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150 { |
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151 #ifndef DISTRHO_OS_WASM |
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152 fRunnerThread.signalThreadShouldExit(); |
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153 #else |
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154 if (fIntervalId != 0) |
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155 { |
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156 d_emscripten_clear_interval(fIntervalId); |
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157 fIntervalId = 0; |
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158 } |
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159 #endif |
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160 } |
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161 |
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162 // --------------------------------------------------------------------------------------------------------------- |
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163 |
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164 /* |
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165 * Returns the name of the runner. |
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166 * This is the name that gets set in the constructor. |
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167 */ |
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168 const String& getRunnerName() const noexcept |
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169 { |
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170 #ifndef DISTRHO_OS_WASM |
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171 return fRunnerThread.getThreadName(); |
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172 #else |
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173 return fRunnerName; |
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174 #endif |
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175 } |
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176 |
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177 // --------------------------------------------------------------------------------------------------------------- |
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178 |
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179 private: |
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180 #ifndef DISTRHO_OS_WASM |
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181 class RunnerThread : public Thread |
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182 { |
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183 Runner* const runner; |
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184 |
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185 public: |
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186 RunnerThread(Runner* const r, const char* const rn) |
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187 : Thread(rn), |
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188 runner(r) {} |
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189 |
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190 protected: |
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191 void run() override |
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192 { |
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193 const uint timeInterval = runner->fTimeInterval; |
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194 |
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195 while (!shouldThreadExit()) |
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196 { |
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197 bool stillRunning = false; |
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198 |
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199 try { |
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200 stillRunning = runner->run(); |
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201 } catch(...) {} |
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202 |
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203 if (stillRunning && !shouldThreadExit()) |
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204 { |
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205 if (timeInterval != 0) |
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206 d_msleep(timeInterval); |
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207 |
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208 // FIXME |
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209 // pthread_yield(); |
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210 continue; |
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211 } |
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212 |
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213 break; |
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214 } |
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215 } |
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216 } fRunnerThread; |
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217 |
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218 uint fTimeInterval; |
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219 #else |
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220 const String fRunnerName; |
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221 long fIntervalId; |
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222 |
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223 void _runEntryPoint() noexcept |
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224 { |
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225 bool stillRunning = false; |
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226 |
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227 try { |
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228 stillRunning = run(); |
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229 } catch(...) {} |
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230 |
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231 if (fIntervalId != 0 && !stillRunning) |
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232 { |
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233 d_emscripten_clear_interval(fIntervalId); |
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234 fIntervalId = 0; |
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235 } |
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236 } |
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237 |
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238 static void _entryPoint(void* const userData) noexcept |
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239 { |
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240 static_cast<Runner*>(userData)->_runEntryPoint(); |
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241 } |
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242 #endif |
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243 |
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244 DISTRHO_DECLARE_NON_COPYABLE(Runner) |
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245 }; |
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246 |
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247 // ------------------------------------------------------------------------------------------------------------------- |
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248 |
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249 END_NAMESPACE_DISTRHO |
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250 |
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251 #endif // DISTRHO_RUNNER_HPP_INCLUDED |