Mercurial > hgrepos > Python2 > PyMuPDF

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>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
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1 /*
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2 * The copyright in this software is being made available under the 2-clauses
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3 * BSD License, included below. This software may be subject to other third
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4 * party and contributor rights, including patent rights, and no such rights
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5 * are granted under this license.
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6 *
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7 * Copyright (c) 2016, Even Rouault
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8 * All rights reserved.
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9 *
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10 * Redistribution and use in source and binary forms, with or without
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11 * modification, are permitted provided that the following conditions
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12 * are met:
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13 * 1. Redistributions of source code must retain the above copyright
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14 * notice, this list of conditions and the following disclaimer.
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15 * 2. Redistributions in binary form must reproduce the above copyright
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16 * notice, this list of conditions and the following disclaimer in the
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17 * documentation and/or other materials provided with the distribution.
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18 *
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19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
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20 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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22 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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23 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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29 * POSSIBILITY OF SUCH DAMAGE.
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30 */
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32 #ifndef THREAD_H
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33 #define THREAD_H
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35 #include "openjpeg.h"
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37 /**
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38 @file thread.h
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39 @brief Thread API
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41 The functions in thread.c have for goal to manage mutex, conditions, thread
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42 creation and thread pools that accept jobs.
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43 */
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45 /** @defgroup THREAD THREAD - Mutex, conditions, threads and thread pools */
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46 /*@{*/
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48 /** @name Mutex */
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49 /*@{*/
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51 /** Opaque type for a mutex */
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52 typedef struct opj_mutex_t opj_mutex_t;
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54 /** Creates a mutex.
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55 * @return the mutex or NULL in case of error (can for example happen if the library
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56 * is built without thread support)
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57 */
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58 opj_mutex_t* opj_mutex_create(void);
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60 /** Lock/acquire the mutex.
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61 * @param mutex the mutex to acquire.
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62 */
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63 void opj_mutex_lock(opj_mutex_t* mutex);
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65 /** Unlock/release the mutex.
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66 * @param mutex the mutex to release.
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67 */
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68 void opj_mutex_unlock(opj_mutex_t* mutex);
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70 /** Destroy a mutex
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71 * @param mutex the mutex to destroy.
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72 */
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73 void opj_mutex_destroy(opj_mutex_t* mutex);
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75 /*@}*/
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77 /** @name Condition */
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78 /*@{*/
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80 /** Opaque type for a condition */
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81 typedef struct opj_cond_t opj_cond_t;
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83 /** Creates a condition.
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84 * @return the condition or NULL in case of error (can for example happen if the library
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85 * is built without thread support)
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86 */
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87 opj_cond_t* opj_cond_create(void);
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88
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89 /** Wait for the condition to be signaled.
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90 * The semantics is the same as the POSIX pthread_cond_wait.
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91 * The provided mutex *must* be acquired before calling this function, and
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92 * released afterwards.
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93 * The mutex will be released by this function while it must wait for the condition
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94 * and reacquired afterwards.
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95 * In some particular situations, the function might return even if the condition is not signaled
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96 * with opj_cond_signal(), hence the need to check with an application level
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97 * mechanism.
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98 *
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99 * Waiting thread :
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100 * \code
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101 * opj_mutex_lock(mutex);
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102 * while( !some_application_level_condition )
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103 * {
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104 * opj_cond_wait(cond, mutex);
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105 * }
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106 * opj_mutex_unlock(mutex);
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107 * \endcode
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108 *
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109 * Signaling thread :
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110 * \code
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111 * opj_mutex_lock(mutex);
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112 * some_application_level_condition = TRUE;
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113 * opj_cond_signal(cond);
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114 * opj_mutex_unlock(mutex);
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115 * \endcode
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116 *
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117 * @param cond the condition to wait.
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118 * @param mutex the mutex (in acquired state before calling this function)
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119 */
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120 void opj_cond_wait(opj_cond_t* cond, opj_mutex_t* mutex);
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121
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122 /** Signal waiting threads on a condition.
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123 * One of the thread waiting with opj_cond_wait() will be waken up.
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124 * It is strongly advised that this call is done with the mutex that is used
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125 * by opj_cond_wait(), in a acquired state.
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126 * @param cond the condition to signal.
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127 */
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128 void opj_cond_signal(opj_cond_t* cond);
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129
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130 /** Destroy a condition
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131 * @param cond the condition to destroy.
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132 */
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133 void opj_cond_destroy(opj_cond_t* cond);
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134
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135 /*@}*/
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136
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137 /** @name Thread */
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138 /*@{*/
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139
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140 /** Opaque type for a thread handle */
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141 typedef struct opj_thread_t opj_thread_t;
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142
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143 /** User function to execute in a thread
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144 * @param user_data user data provided with opj_thread_create()
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145 */
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146 typedef void (*opj_thread_fn)(void* user_data);
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147
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148 /** Creates a new thread.
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149 * @param thread_fn Function to run in the new thread.
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150 * @param user_data user data provided to the thread function. Might be NULL.
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151 * @return a thread handle or NULL in case of failure (can for example happen if the library
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152 * is built without thread support)
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153 */
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154 opj_thread_t* opj_thread_create(opj_thread_fn thread_fn, void* user_data);
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155
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156 /** Wait for a thread to be finished and release associated resources to the
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157 * thread handle.
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158 * @param thread the thread to wait for being finished.
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159 */
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160 void opj_thread_join(opj_thread_t* thread);
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161
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162 /*@}*/
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163
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164 /** @name Thread local storage */
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165 /*@{*/
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166 /** Opaque type for a thread local storage */
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167 typedef struct opj_tls_t opj_tls_t;
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168
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169 /** Get a thread local value corresponding to the provided key.
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170 * @param tls thread local storage handle
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171 * @param key key whose value to retrieve.
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172 * @return value associated with the key, or NULL is missing.
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173 */
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174 void* opj_tls_get(opj_tls_t* tls, int key);
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175
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176 /** Type of the function used to free a TLS value */
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177 typedef void (*opj_tls_free_func)(void* value);
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178
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179 /** Set a thread local value corresponding to the provided key.
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180 * @param tls thread local storage handle
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181 * @param key key whose value to set.
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182 * @param value value to set (may be NULL).
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183 * @param free_func function to call currently installed value.
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184 * @return OPJ_TRUE if successful.
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185 */
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186 OPJ_BOOL opj_tls_set(opj_tls_t* tls, int key, void* value,
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187 opj_tls_free_func free_func);
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188
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189 /*@}*/
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190
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191 /** @name Thread pool */
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192 /*@{*/
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193
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194 /** Opaque type for a thread pool */
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195 typedef struct opj_thread_pool_t opj_thread_pool_t;
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196
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197 /** Create a new thread pool.
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198 * num_thread must nominally be >= 1 to create a real thread pool. If num_threads
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199 * is negative or null, then a dummy thread pool will be created. All functions
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200 * operating on the thread pool will work, but job submission will be run
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201 * synchronously in the calling thread.
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202 *
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203 * @param num_threads the number of threads to allocate for this thread pool.
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204 * @return a thread pool handle, or NULL in case of failure (can for example happen if the library
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205 * is built without thread support)
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206 */
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207 opj_thread_pool_t* opj_thread_pool_create(int num_threads);
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208
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209 /** User function to execute in a thread
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210 * @param user_data user data provided with opj_thread_create()
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211 * @param tls handle to thread local storage
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212 */
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213 typedef void (*opj_job_fn)(void* user_data, opj_tls_t* tls);
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214
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215
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216 /** Submit a new job to be run by one of the thread in the thread pool.
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217 * The job ( thread_fn, user_data ) will be added in the queue of jobs managed
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218 * by the thread pool, and run by the first thread that is no longer busy.
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219 *
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220 * @param tp the thread pool handle.
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221 * @param job_fn Function to run. Must not be NULL.
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222 * @param user_data User data provided to thread_fn.
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223 * @return OPJ_TRUE if the job was successfully submitted.
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224 */
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225 OPJ_BOOL opj_thread_pool_submit_job(opj_thread_pool_t* tp, opj_job_fn job_fn,
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226 void* user_data);
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227
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228 /** Wait that no more than max_remaining_jobs jobs are remaining in the queue of
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229 * the thread pool. The aim of this function is to avoid submitting too many
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230 * jobs while the thread pool cannot cope fast enough with them, which would
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231 * result potentially in out-of-memory situations with too many job descriptions
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232 * being queued.
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233 *
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234 * @param tp the thread pool handle
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235 * @param max_remaining_jobs maximum number of jobs allowed to be queued without waiting.
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236 */
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237 void opj_thread_pool_wait_completion(opj_thread_pool_t* tp,
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238 int max_remaining_jobs);
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239
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240 /** Return the number of threads associated with the thread pool.
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241 *
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242 * @param tp the thread pool handle.
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243 * @return number of threads associated with the thread pool.
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244 */
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245 int opj_thread_pool_get_thread_count(opj_thread_pool_t* tp);
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246
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247 /** Destroy a thread pool.
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248 * @param tp the thread pool handle.
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249 */
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250 void opj_thread_pool_destroy(opj_thread_pool_t* tp);
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251
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252 /*@}*/
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253
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254 /*@}*/
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255
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256 #endif /* THREAD_H */