| /*************************************************************************** |
| * _ _ ____ _ |
| * Project ___| | | | _ \| | |
| * / __| | | | |_) | | |
| * | (__| |_| | _ <| |___ |
| * \___|\___/|_| \_\_____| |
| * |
| * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, 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.haxx.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> |
| * Multi-threaded transfers sharing a single connection pool |
| * </DESC> |
| * |
| * This example fires up NUM_THREADS threads and in each single thread, it |
| * downloads the same fixed URL a URL_ITERATIONS number of times. The received |
| * data is just thrown away. It sets up a single shared object that holds the |
| * connection cache and all easy handles in all threads share that same cache. |
| * |
| * This example uses pthreads for threads and mutexes, but should be easy to |
| * modify to use different thread/mutex system should you want to. |
| * |
| */ |
| |
| #include <stdio.h> |
| #include <pthread.h> |
| #include <curl/curl.h> |
| |
| /* |
| URL to fetch. If you select HTTPS, you need to use a TLS backend with mutex |
| locks taken care of (OpenSSL 1.1.x, NSS, etc) or add SSL mutex callbacks! |
| */ |
| #define URL "http://localhost/4KB" |
| |
| /* number of threads to fire up in parallel */ |
| #define NUM_THREADS 67 |
| |
| /* how many times each URL is transferred per thread */ |
| #define URL_ITERATIONS 11235 |
| |
| static pthread_mutex_t connlock; |
| |
| static size_t write_db(void *ptr, size_t size, size_t nmemb, void *data) |
| { |
| /* not interested in the downloaded bytes, return the size */ |
| (void)ptr; /* unused */ |
| (void)data; /* unused */ |
| return (size_t)(size * nmemb); |
| } |
| |
| static void lock_cb(CURL *handle, curl_lock_data data, |
| curl_lock_access access, void *userptr) |
| { |
| (void)access; /* unused */ |
| (void)userptr; /* unused */ |
| (void)handle; /* unused */ |
| (void)data; /* unused */ |
| pthread_mutex_lock(&connlock); |
| } |
| |
| static void unlock_cb(CURL *handle, curl_lock_data data, |
| void *userptr) |
| { |
| (void)userptr; /* unused */ |
| (void)handle; /* unused */ |
| (void)data; /* unused */ |
| pthread_mutex_unlock(&connlock); |
| } |
| |
| static void init_locks(void) |
| { |
| pthread_mutex_init(&connlock, NULL); |
| } |
| |
| static void kill_locks(void) |
| { |
| pthread_mutex_destroy(&connlock); |
| } |
| |
| struct initurl { |
| const char *url; |
| CURLSH *share; |
| int threadno; |
| }; |
| |
| static void *run_thread(void *ptr) |
| { |
| struct initurl *u = (struct initurl *)ptr; |
| int i; |
| |
| for(i = 0; i < URL_ITERATIONS; i++) { |
| CURL *curl = curl_easy_init(); |
| curl_easy_setopt(curl, CURLOPT_URL, u->url); |
| curl_easy_setopt(curl, CURLOPT_VERBOSE, 0L); |
| curl_easy_setopt(curl, CURLOPT_SHARE, u->share); |
| curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_db); |
| curl_easy_perform(curl); /* ignores error */ |
| curl_easy_cleanup(curl); |
| fprintf(stderr, "Thread %d transfer %d\n", u->threadno, i); |
| } |
| |
| return NULL; |
| } |
| |
| int main(void) |
| { |
| pthread_t tid[NUM_THREADS]; |
| int i; |
| CURLSH *share; |
| struct initurl url[NUM_THREADS]; |
| |
| /* Must initialize libcurl before any threads are started */ |
| curl_global_init(CURL_GLOBAL_ALL); |
| |
| share = curl_share_init(); |
| curl_share_setopt(share, CURLSHOPT_LOCKFUNC, lock_cb); |
| curl_share_setopt(share, CURLSHOPT_UNLOCKFUNC, unlock_cb); |
| curl_share_setopt(share, CURLSHOPT_SHARE, CURL_LOCK_DATA_CONNECT); |
| |
| init_locks(); |
| |
| for(i = 0; i< NUM_THREADS; i++) { |
| int error; |
| url[i].url = URL; |
| url[i].share = share; |
| url[i].threadno = i; |
| error = pthread_create(&tid[i], NULL, run_thread, &url[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, URL); |
| } |
| |
| /* now wait for all threads to terminate */ |
| for(i = 0; i< NUM_THREADS; i++) { |
| pthread_join(tid[i], NULL); |
| fprintf(stderr, "Thread %d terminated\n", i); |
| } |
| |
| kill_locks(); |
| |
| curl_share_cleanup(share); |
| curl_global_cleanup(); |
| return 0; |
| } |