151 lines
3.5 KiB
C
151 lines
3.5 KiB
C
/*****************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* $Id$
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*
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* A multi-threaded example that uses pthreads and fetches 4 remote files at
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* once over HTTPS. The lock callbacks and stuff assume OpenSSL or GnuTLS
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* (libgcrypt) so far.
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*
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* OpenSSL docs for this:
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* http://www.openssl.org/docs/crypto/threads.html
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* gcrypt docs for this:
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* http://gnupg.org/documentation/manuals/gcrypt/Multi_002dThreading.html
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*/
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#define USE_OPENSSL /* or USE_GNUTLS accordingly */
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#include <stdio.h>
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#include <pthread.h>
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#include <curl/curl.h>
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#define NUMT 4
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/* we have this global to let the callback get easy access to it */
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static pthread_mutex_t *lockarray;
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#ifdef USE_OPENSSL
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#include <openssl/crypto.h>
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static void lock_callback(int mode, int type, char *file, int line)
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{
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(void)file;
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(void)line;
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if (mode & CRYPTO_LOCK) {
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pthread_mutex_lock(&(lockarray[type]));
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}
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else {
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pthread_mutex_unlock(&(lockarray[type]));
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}
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}
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static unsigned long thread_id(void)
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{
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unsigned long ret;
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ret=(unsigned long)pthread_self();
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return(ret);
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}
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static void init_locks(void)
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{
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int i;
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lockarray=(pthread_mutex_t *)OPENSSL_malloc(CRYPTO_num_locks() *
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sizeof(pthread_mutex_t));
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for (i=0; i<CRYPTO_num_locks(); i++) {
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pthread_mutex_init(&(lockarray[i]),NULL);
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}
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CRYPTO_set_id_callback((unsigned long (*)())thread_id);
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CRYPTO_set_locking_callback((void (*)())lock_callback);
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}
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static void kill_locks(void)
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{
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int i;
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CRYPTO_set_locking_callback(NULL);
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for (i=0; i<CRYPTO_num_locks(); i++)
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pthread_mutex_destroy(&(lockarray[i]));
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OPENSSL_free(lockarray);
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}
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#endif
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#ifdef USE_GNUTLS
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#include <gcrypt.h>
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#include <errno.h>
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GCRY_THREAD_OPTION_PTHREAD_IMPL;
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void init_locks(void)
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{
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gcry_control(GCRYCTL_SET_THREAD_CBS);
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}
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#define kill_locks()
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#endif
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/* List of URLs to fetch.*/
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const char * const urls[]= {
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"https://www.sf.net/",
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"https://www.openssl.org/",
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"https://www.sf.net/",
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"https://www.openssl.org/",
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};
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static void *pull_one_url(void *url)
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{
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CURL *curl;
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curl = curl_easy_init();
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curl_easy_setopt(curl, CURLOPT_URL, url);
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/* this example doesn't verify the server's certificate, which means we
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might be downloading stuff from an impostor */
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curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
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curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
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curl_easy_perform(curl); /* ignores error */
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curl_easy_cleanup(curl);
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return NULL;
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}
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int main(int argc, char **argv)
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{
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pthread_t tid[NUMT];
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int i;
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int error;
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(void)argc; /* we don't use any arguments in this example */
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(void)argv;
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/* Must initialize libcurl before any threads are started */
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curl_global_init(CURL_GLOBAL_ALL);
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init_locks();
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for(i=0; i< NUMT; i++) {
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error = pthread_create(&tid[i],
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NULL, /* default attributes please */
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pull_one_url,
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(void *)urls[i]);
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if(0 != error)
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fprintf(stderr, "Couldn't run thread number %d, errno %d\n", i, error);
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else
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fprintf(stderr, "Thread %d, gets %s\n", i, urls[i]);
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}
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/* now wait for all threads to terminate */
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for(i=0; i< NUMT; i++) {
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error = pthread_join(tid[i], NULL);
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fprintf(stderr, "Thread %d terminated\n", i);
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}
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kill_locks();
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return 0;
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}
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