Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/include/mupdf/helpers/mu-threads.h @ 40:aa33339d6b8a upstream

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ADD: MuPDF v1.26.10: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.5.
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 11:31:38 +0200
parents b50eed0cc0ef
children
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1 // Copyright (C) 2004-2021 Artifex Software, Inc.
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2 //
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3 // This file is part of MuPDF.
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4 //
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5 // MuPDF is free software: you can redistribute it and/or modify it under the
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6 // terms of the GNU Affero General Public License as published by the Free
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7 // Software Foundation, either version 3 of the License, or (at your option)
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8 // any later version.
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9 //
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10 // MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
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11 // WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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12 // FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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13 // details.
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14 //
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15 // You should have received a copy of the GNU Affero General Public License
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16 // along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
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17 //
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18 // Alternative licensing terms are available from the licensor.
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19 // For commercial licensing, see <https://www.artifex.com/> or contact
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20 // Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
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21 // CA 94129, USA, for further information.
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22
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23 #ifndef MUPDF_HELPERS_MU_THREADS_H
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24 #define MUPDF_HELPERS_MU_THREADS_H
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25
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26 /*
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27 Simple threading helper library.
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28 Includes implementations for Windows, pthreads,
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29 and "no threads".
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30
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31 The "no threads" implementation simply provides types
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32 and stub functions so that things will build, but abort
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33 if we try to call them. This simplifies the job for
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34 calling functions.
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35
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36 To build this library on a platform with no threading,
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37 define DISABLE_MUTHREADS (or extend the ifdeffery below
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38 so that it does so).
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39
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40 To build this library on a platform that uses a
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41 threading model other than windows threads or pthreads,
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42 extend the #ifdeffery below to set MUTHREAD_IMPL_TYPE
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43 to an unused value, and modify mu-threads.c
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44 appropriately.
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45 */
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46
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47 #if !defined(DISABLE_MUTHREADS)
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48 #ifdef _WIN32
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49 #define MU_THREAD_IMPL_TYPE 1
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50 #elif defined(HAVE_PTHREAD)
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51 #define MU_THREAD_IMPL_TYPE 2
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52 #else
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53 #define DISABLE_MUTHREADS
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54 #endif
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55 #endif
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56
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57 /*
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58 Types
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59 */
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60 typedef struct mu_thread mu_thread;
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61 typedef struct mu_semaphore mu_semaphore;
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62 typedef struct mu_mutex mu_mutex;
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63
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64 /*
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65 Semaphores
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66
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67 Created with a value of 0. Triggering a semaphore
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68 increments the value. Waiting on a semaphore reduces
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69 the value, blocking if it would become negative.
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70
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71 Never increment the value of a semaphore above 1, as
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72 this has undefined meaning in this implementation.
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73 */
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74
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75 /*
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76 Create a semaphore.
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77
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78 sem: Pointer to a mu_semaphore to populate.
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79
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80 Returns non-zero for error.
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81 */
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82 int mu_create_semaphore(mu_semaphore *sem);
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83
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84 /*
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85 Destroy a semaphore.
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86 Semaphores may safely be destroyed multiple
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87 times. Any semaphore initialised to zeros is
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88 safe to destroy.
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89
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90 Never destroy a semaphore that may be being waited
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91 upon, as this has undefined meaning in this
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92 implementation.
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93
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94 sem: Pointer to a mu_semaphore to destroy.
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95 */
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96 void mu_destroy_semaphore(mu_semaphore *sem);
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97
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98 /*
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99 Increment the value of the
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100 semaphore. Never blocks.
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101
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102 sem: The semaphore to increment.
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103
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104 Returns non-zero on error.
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105 */
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106 int mu_trigger_semaphore(mu_semaphore *sem);
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107
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108 /*
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109 Decrement the value of the
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110 semaphore, blocking if this would involve making
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111 the value negative.
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112
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113 sem: The semaphore to decrement.
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114
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115 Returns non-zero on error.
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116 */
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117 int mu_wait_semaphore(mu_semaphore *sem);
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118
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119 /*
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120 Threads
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121 */
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122
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123 /*
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124 The type for the function that a thread runs.
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125
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126 arg: User supplied data.
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127 */
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128 typedef void (mu_thread_fn)(void *arg);
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129
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130 /*
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131 Create a thread to run the
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132 supplied function with the supplied argument.
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133
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134 th: Pointer to mu_thread to populate with created
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135 threads information.
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136
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137 fn: The function for the thread to run.
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138
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139 arg: The argument to pass to fn.
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140 */
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141 int mu_create_thread(mu_thread *th, mu_thread_fn *fn, void *arg);
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142
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143 /*
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144 Destroy a thread. This function
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145 blocks until a thread has terminated normally, and
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146 destroys its storage. A mu_thread may safely be destroyed
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147 multiple times, as may any mu_thread initialised with
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148 zeros.
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149
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150 th: Pointer to mu_thread to destroy.
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151 */
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152 void mu_destroy_thread(mu_thread *th);
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153
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154 /*
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155 Mutexes
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156
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157 This implementation does not specify whether
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158 mutexes are recursive or not.
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159 */
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160
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161 /*
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162 Create a mutex.
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163
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164 mutex: pointer to a mu_mutex to populate.
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165
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166 Returns non-zero on error.
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167 */
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168 int mu_create_mutex(mu_mutex *mutex);
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169
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170 /*
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171 Destroy a mutex. A mu_mutex may
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172 safely be destroyed several times, as may a mu_mutex
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173 initialised with zeros. Never destroy locked mu_mutex.
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174
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175 mutex: Pointer to mu_mutex to destroy.
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176 */
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177 void mu_destroy_mutex(mu_mutex *mutex);
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178
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179 /*
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180 Lock a mutex.
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181
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182 mutex: Mutex to lock.
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183 */
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184 void mu_lock_mutex(mu_mutex *mutex);
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185
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186 /*
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187 Unlock a mutex.
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188
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189 mutex: Mutex to unlock.
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190 */
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191 void mu_unlock_mutex(mu_mutex *mutex);
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192
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193 /*
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194 Everything under this point is implementation specific.
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195 Only people looking to extend the capabilities of this
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196 helper module should need to look below here.
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197 */
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198
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199 #ifdef DISABLE_MUTHREADS
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200
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201 /* Null implementation */
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202 struct mu_semaphore
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203 {
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204 int dummy;
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205 };
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206
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207 struct mu_thread
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208 {
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209 int dummy;
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210 };
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211
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212 struct mu_mutex
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213 {
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214 int dummy;
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215 };
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216
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217 #elif MU_THREAD_IMPL_TYPE == 1
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218
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219 #include <windows.h>
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220
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221 /* Windows threads */
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222 struct mu_semaphore
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223 {
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224 HANDLE handle;
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225 };
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226
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227 struct mu_thread
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228 {
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229 HANDLE handle;
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230 mu_thread_fn *fn;
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231 void *arg;
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232 };
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233
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234 struct mu_mutex
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235 {
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236 CRITICAL_SECTION mutex;
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237 };
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238
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239 #elif MU_THREAD_IMPL_TYPE == 2
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240
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241 /*
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242 PThreads - without working unnamed semaphores.
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243
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244 Neither ios nor OSX supports unnamed semaphores.
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245 Named semaphores are a pain to use, so we implement
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246 our own semaphores using condition variables and
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247 mutexes.
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248 */
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249
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250 #include <pthread.h>
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251
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252 struct mu_semaphore
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253 {
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254 int count;
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255 pthread_mutex_t mutex;
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256 pthread_cond_t cond;
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257 };
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258
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259 struct mu_thread
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260 {
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261 pthread_t thread;
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262 mu_thread_fn *fn;
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263 void *arg;
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264 };
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265
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266 struct mu_mutex
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267 {
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268 pthread_mutex_t mutex;
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269 };
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270
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271 /*
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272 Add new threading implementations here, with
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273 #elif MU_THREAD_IMPL_TYPE == 3... etc.
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274 */
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275
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276 #else
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277 #error Unknown MU_THREAD_IMPL_TYPE setting
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278 #endif
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279
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280 #endif /* MUPDF_HELPERS_MU_THREADS_H */