1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
/***************************************************************************
* _ _ ____ _
* 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;
}
|
