Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/docs/examples/threaded-shared-conn.c @ 32:72c1b70d4f5c

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author Franz Glasner <fzglas.hg@dom66.de>
date Sun, 21 Sep 2025 15:10:12 +0200
parents b50eed0cc0ef
children
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1 /***************************************************************************
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2 * _ _ ____ _
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3 * Project ___| | | | _ \| |
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4 * / __| | | | |_) | |
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5 * | (__| |_| | _ <| |___
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6 * \___|\___/|_| \_\_____|
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7 *
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8 * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
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9 *
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10 * This software is licensed as described in the file COPYING, which
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11 * you should have received as part of this distribution. The terms
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12 * are also available at https://curl.haxx.se/docs/copyright.html.
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13 *
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14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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15 * copies of the Software, and permit persons to whom the Software is
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16 * furnished to do so, under the terms of the COPYING file.
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17 *
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18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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19 * KIND, either express or implied.
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20 *
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21 ***************************************************************************/
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22 /* <DESC>
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23 * Multi-threaded transfers sharing a single connection pool
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24 * </DESC>
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25 *
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26 * This example fires up NUM_THREADS threads and in each single thread, it
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27 * downloads the same fixed URL a URL_ITERATIONS number of times. The received
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28 * data is just thrown away. It sets up a single shared object that holds the
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29 * connection cache and all easy handles in all threads share that same cache.
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30 *
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31 * This example uses pthreads for threads and mutexes, but should be easy to
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32 * modify to use different thread/mutex system should you want to.
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33 *
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34 */
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36 #include <stdio.h>
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37 #include <pthread.h>
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38 #include <curl/curl.h>
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40 /*
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41 URL to fetch. If you select HTTPS, you need to use a TLS backend with mutex
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42 locks taken care of (OpenSSL 1.1.x, NSS, etc) or add SSL mutex callbacks!
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43 */
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44 #define URL "http://localhost/4KB"
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46 /* number of threads to fire up in parallel */
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47 #define NUM_THREADS 67
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49 /* how many times each URL is transferred per thread */
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50 #define URL_ITERATIONS 11235
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52 static pthread_mutex_t connlock;
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54 static size_t write_db(void *ptr, size_t size, size_t nmemb, void *data)
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55 {
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56 /* not interested in the downloaded bytes, return the size */
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57 (void)ptr; /* unused */
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58 (void)data; /* unused */
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59 return (size_t)(size * nmemb);
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60 }
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62 static void lock_cb(CURL *handle, curl_lock_data data,
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63 curl_lock_access access, void *userptr)
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64 {
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65 (void)access; /* unused */
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66 (void)userptr; /* unused */
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67 (void)handle; /* unused */
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68 (void)data; /* unused */
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69 pthread_mutex_lock(&connlock);
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70 }
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72 static void unlock_cb(CURL *handle, curl_lock_data data,
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73 void *userptr)
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74 {
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75 (void)userptr; /* unused */
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76 (void)handle; /* unused */
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77 (void)data; /* unused */
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78 pthread_mutex_unlock(&connlock);
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79 }
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81 static void init_locks(void)
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82 {
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83 pthread_mutex_init(&connlock, NULL);
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84 }
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86 static void kill_locks(void)
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87 {
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88 pthread_mutex_destroy(&connlock);
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89 }
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91 struct initurl {
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92 const char *url;
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93 CURLSH *share;
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94 int threadno;
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95 };
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97 static void *run_thread(void *ptr)
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98 {
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99 struct initurl *u = (struct initurl *)ptr;
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100 int i;
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101
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102 for(i = 0; i < URL_ITERATIONS; i++) {
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103 CURL *curl = curl_easy_init();
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104 curl_easy_setopt(curl, CURLOPT_URL, u->url);
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105 curl_easy_setopt(curl, CURLOPT_VERBOSE, 0L);
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106 curl_easy_setopt(curl, CURLOPT_SHARE, u->share);
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107 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_db);
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108 curl_easy_perform(curl); /* ignores error */
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109 curl_easy_cleanup(curl);
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110 fprintf(stderr, "Thread %d transfer %d\n", u->threadno, i);
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111 }
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112
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113 return NULL;
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114 }
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115
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116 int main(void)
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117 {
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118 pthread_t tid[NUM_THREADS];
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119 int i;
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120 CURLSH *share;
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121 struct initurl url[NUM_THREADS];
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122
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123 /* Must initialize libcurl before any threads are started */
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124 curl_global_init(CURL_GLOBAL_ALL);
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125
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126 share = curl_share_init();
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127 curl_share_setopt(share, CURLSHOPT_LOCKFUNC, lock_cb);
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128 curl_share_setopt(share, CURLSHOPT_UNLOCKFUNC, unlock_cb);
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129 curl_share_setopt(share, CURLSHOPT_SHARE, CURL_LOCK_DATA_CONNECT);
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130
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131 init_locks();
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132
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133 for(i = 0; i< NUM_THREADS; i++) {
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134 int error;
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135 url[i].url = URL;
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136 url[i].share = share;
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137 url[i].threadno = i;
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138 error = pthread_create(&tid[i], NULL, run_thread, &url[i]);
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139 if(0 != error)
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140 fprintf(stderr, "Couldn't run thread number %d, errno %d\n", i, error);
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141 else
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142 fprintf(stderr, "Thread %d, gets %s\n", i, URL);
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143 }
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144
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145 /* now wait for all threads to terminate */
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146 for(i = 0; i< NUM_THREADS; i++) {
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147 pthread_join(tid[i], NULL);
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148 fprintf(stderr, "Thread %d terminated\n", i);
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149 }
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150
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151 kill_locks();
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152
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153 curl_share_cleanup(share);
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154 curl_global_cleanup();
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155 return 0;
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156 }