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1 /***************************************************************************
2  *                                  _   _ ____  _
3  *  Project                     ___| | | |  _ \| |
4  *                             / __| | | | |_) | |
5  *                            | (__| |_| |  _ <| |___
6  *                             \___|\___/|_| \_\_____|
7  *
8  * Copyright (C) 2019 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
9  *
10  * This software is licensed as described in the file COPYING, which
11  * you should have received as part of this distribution. The terms
12  * are also available at https://curl.se/docs/copyright.html.
13  *
14  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15  * copies of the Software, and permit persons to whom the Software is
16  * furnished to do so, under the terms of the COPYING file.
17  *
18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19  * KIND, either express or implied.
20  *
21  ***************************************************************************/
22 /*
23  * KNOW_BUGS "A shared connection cache is not thread-safe"
24  *
25  * This source code was used to verify shared connection cache but since this
26  * is a known issue the test is no longer built or run. This code is here to
27  * allow for testing once someone gets to work on fixing this.
28  */
29 #include "test.h"
30 
31 #include "testutil.h"
32 #include "warnless.h"
33 #include "memdebug.h"
34 
35 #ifdef HAVE_PTHREAD_H
36 #include <pthread.h>
37 #include <time.h>
38 
39 /* number of threads to fire up in parallel */
40 #define NUM_THREADS 67
41 
42 /* for how many seconds each thread will loop */
43 #define RUN_FOR_SECONDS 7
44 
45 static pthread_mutex_t connlock;
46 
write_db(void * ptr,size_t size,size_t nmemb,void * data)47 static size_t write_db(void *ptr, size_t size, size_t nmemb, void *data)
48 {
49   /* not interested in the downloaded bytes, return the size */
50   (void)ptr;  /* unused */
51   (void)data; /* unused */
52   return (size_t)(size * nmemb);
53 }
54 
lock_cb(CURL * handle,curl_lock_data data,curl_lock_access access,void * userptr)55 static void lock_cb(CURL *handle, curl_lock_data data,
56                     curl_lock_access access, void *userptr)
57 {
58   (void)access; /* unused */
59   (void)userptr; /* unused */
60   (void)handle; /* unused */
61   (void)data; /* unused */
62   pthread_mutex_lock(&connlock);
63 }
64 
unlock_cb(CURL * handle,curl_lock_data data,void * userptr)65 static void unlock_cb(CURL *handle, curl_lock_data data,
66                       void *userptr)
67 {
68   (void)userptr; /* unused */
69   (void)handle;  /* unused */
70   (void)data;    /* unused */
71   pthread_mutex_unlock(&connlock);
72 }
73 
init_locks(void)74 static void init_locks(void)
75 {
76   pthread_mutex_init(&connlock, NULL);
77 }
78 
kill_locks(void)79 static void kill_locks(void)
80 {
81   pthread_mutex_destroy(&connlock);
82 }
83 
84 struct initurl {
85   const char *url;
86   CURLSH *share;
87   int threadno;
88 };
89 
run_thread(void * ptr)90 static void *run_thread(void *ptr)
91 {
92   struct initurl *u = (struct initurl *)ptr;
93   int i;
94   time_t end = time(NULL) + RUN_FOR_SECONDS;
95 
96   for(i = 0; time(NULL) < end; i++) {
97     CURL *curl = curl_easy_init();
98     curl_easy_setopt(curl, CURLOPT_URL, u->url);
99     curl_easy_setopt(curl, CURLOPT_VERBOSE, 0L);
100     curl_easy_setopt(curl, CURLOPT_SHARE, u->share);
101     curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_db);
102     curl_easy_perform(curl); /* ignores error */
103     curl_easy_cleanup(curl);
104     fprintf(stderr, "Thread %d transfer %d\n", u->threadno, i);
105   }
106 
107   return NULL;
108 }
109 
test(char * URL)110 int test(char *URL)
111 {
112   pthread_t tid[NUM_THREADS];
113   int i;
114   CURLSH *share;
115   struct initurl url[NUM_THREADS];
116 
117   /* Must initialize libcurl before any threads are started */
118   curl_global_init(CURL_GLOBAL_ALL);
119 
120   share = curl_share_init();
121   curl_share_setopt(share, CURLSHOPT_LOCKFUNC, lock_cb);
122   curl_share_setopt(share, CURLSHOPT_UNLOCKFUNC, unlock_cb);
123   curl_share_setopt(share, CURLSHOPT_SHARE, CURL_LOCK_DATA_CONNECT);
124 
125   init_locks();
126 
127   for(i = 0; i< NUM_THREADS; i++) {
128     int error;
129     url[i].url = URL;
130     url[i].share = share;
131     url[i].threadno = i;
132     error = pthread_create(&tid[i], NULL, run_thread, &url[i]);
133     if(0 != error)
134       fprintf(stderr, "Couldn't run thread number %d, errno %d\n", i, error);
135     else
136       fprintf(stderr, "Thread %d, gets %s\n", i, URL);
137   }
138 
139   /* now wait for all threads to terminate */
140   for(i = 0; i< NUM_THREADS; i++) {
141     pthread_join(tid[i], NULL);
142     fprintf(stderr, "Thread %d terminated\n", i);
143   }
144 
145   kill_locks();
146 
147   curl_share_cleanup(share);
148   curl_global_cleanup();
149   return 0;
150 }
151 
152 #else /* without pthread, this test doesn't work */
test(char * URL)153 int test(char *URL)
154 {
155   (void)URL;
156   return 0;
157 }
158 #endif
159