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/*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * Copyright (C) 1998 - 2020, Daniel Stenberg, <[email protected]>, et al. * * This software is licensed as described in the file COPYING, which * you should have received as part of this distribution. The terms * are also available at https://curl.se/docs/copyright.html. * * You may opt to use, copy, modify, merge, publish, distribute and/or sell * copies of the Software, and permit persons to whom the Software is * furnished to do so, under the terms of the COPYING file. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ***************************************************************************/ /* <DESC> * A multi-threaded example that uses pthreads to fetch several files at once * </DESC> */ #include <stdio.h> #include <pthread.h> #include <curl/curl.h> #define NUMT 4 /* List of URLs to fetch. If you intend to use a SSL-based protocol here you might need to setup TLS library mutex callbacks as described here: https://curl.se/libcurl/c/threadsafe.html */ const char * const urls[NUMT]= { "https://curl.se/", "ftp://cool.haxx.se/", "https://www.cag.se/", "www.haxx.se" }; static void *pull_one_url(void *url) { CURL *curl; curl = curl_easy_init(); curl_easy_setopt(curl, CURLOPT_URL, url); curl_easy_perform(curl); /* ignores error */ curl_easy_cleanup(curl); return NULL; } /* int pthread_create(pthread_t *new_thread_ID, const pthread_attr_t *attr, void * (*start_func)(void *), void *arg); */ int main(int argc, char **argv) { pthread_t tid[NUMT]; int i; /* Must initialize libcurl before any threads are started */ curl_global_init(CURL_GLOBAL_ALL); for(i = 0; i< NUMT; i++) { int error = pthread_create(&tid[i], NULL, /* default attributes please */ pull_one_url, (void *)urls[i]); if(0 != error) fprintf(stderr, "Couldn't run thread number %d, errno %d\n", i, error); else fprintf(stderr, "Thread %d, gets %s\n", i, urls[i]); } /* now wait for all threads to terminate */ for(i = 0; i< NUMT; i++) { pthread_join(tid[i], NULL); fprintf(stderr, "Thread %d terminated\n", i); } curl_global_cleanup(); return 0; }