1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 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 /* <DESC>
23 * A multi threaded application that uses a progress bar to show
24 * status. It uses Gtk+ to make a smooth pulse.
25 * </DESC>
26 */
27 /*
28 * Written by Jud Bishop after studying the other examples provided with
29 * libcurl.
30 *
31 * To compile (on a single line):
32 * gcc -ggdb `pkg-config --cflags --libs gtk+-2.0` -lcurl -lssl -lcrypto
33 * -lgthread-2.0 -dl smooth-gtk-thread.c -o smooth-gtk-thread
34 */
35
36 #include <stdio.h>
37 #include <gtk/gtk.h>
38 #include <glib.h>
39 #include <unistd.h>
40 #include <pthread.h>
41
42 #include <curl/curl.h>
43
44 #define NUMT 4
45
46 pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
47 int j = 0;
48 gint num_urls = 9; /* Just make sure this is less than urls[]*/
49 const char * const urls[]= {
50 "90022",
51 "90023",
52 "90024",
53 "90025",
54 "90026",
55 "90027",
56 "90028",
57 "90029",
58 "90030"
59 };
60
write_file(void * ptr,size_t size,size_t nmemb,FILE * stream)61 size_t write_file(void *ptr, size_t size, size_t nmemb, FILE *stream)
62 {
63 /* printf("write_file\n"); */
64 return fwrite(ptr, size, nmemb, stream);
65 }
66
67 /* https://weather.com/weather/today/l/46214?cc=*&dayf=5&unit=i */
pull_one_url(void * NaN)68 void *pull_one_url(void *NaN)
69 {
70 /* Stop threads from entering unless j is incremented */
71 pthread_mutex_lock(&lock);
72 while(j < num_urls) {
73 CURL *curl;
74 gchar *http;
75
76 printf("j = %d\n", j);
77
78 http =
79 g_strdup_printf("xoap.weather.com/weather/local/%s?cc=*&dayf=5&unit=i\n",
80 urls[j]);
81
82 printf("http %s", http);
83
84 curl = curl_easy_init();
85 if(curl) {
86
87 FILE *outfile = fopen(urls[j], "wb");
88
89 /* Set the URL and transfer type */
90 curl_easy_setopt(curl, CURLOPT_URL, http);
91
92 /* Write to the file */
93 curl_easy_setopt(curl, CURLOPT_WRITEDATA, outfile);
94 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_file);
95
96 j++; /* critical line */
97 pthread_mutex_unlock(&lock);
98
99 curl_easy_perform(curl);
100
101 fclose(outfile);
102 printf("fclose\n");
103
104 curl_easy_cleanup(curl);
105 }
106 g_free(http);
107
108 /* Adds more latency, testing the mutex.*/
109 sleep(1);
110
111 } /* end while */
112 return NULL;
113 }
114
115
pulse_bar(gpointer data)116 gboolean pulse_bar(gpointer data)
117 {
118 gdk_threads_enter();
119 gtk_progress_bar_pulse(GTK_PROGRESS_BAR (data));
120 gdk_threads_leave();
121
122 /* Return true so the function will be called again;
123 * returning false removes this timeout function.
124 */
125 return TRUE;
126 }
127
create_thread(void * progress_bar)128 void *create_thread(void *progress_bar)
129 {
130 pthread_t tid[NUMT];
131 int i;
132
133 /* Make sure I don't create more threads than urls. */
134 for(i = 0; i < NUMT && i < num_urls ; i++) {
135 int error = pthread_create(&tid[i],
136 NULL, /* default attributes please */
137 pull_one_url,
138 NULL);
139 if(0 != error)
140 fprintf(stderr, "Couldn't run thread number %d, errno %d\n", i, error);
141 else
142 fprintf(stderr, "Thread %d, gets %s\n", i, urls[i]);
143 }
144
145 /* Wait for all threads to terminate. */
146 for(i = 0; i < NUMT && i < num_urls; i++) {
147 pthread_join(tid[i], NULL);
148 fprintf(stderr, "Thread %d terminated\n", i);
149 }
150
151 /* This stops the pulsing if you have it turned on in the progress bar
152 section */
153 g_source_remove(GPOINTER_TO_INT(g_object_get_data(G_OBJECT(progress_bar),
154 "pulse_id")));
155
156 /* This destroys the progress bar */
157 gtk_widget_destroy(progress_bar);
158
159 /* [Un]Comment this out to kill the program rather than pushing close. */
160 /* gtk_main_quit(); */
161
162
163 return NULL;
164
165 }
166
cb_delete(GtkWidget * window,gpointer data)167 static gboolean cb_delete(GtkWidget *window, gpointer data)
168 {
169 gtk_main_quit();
170 return FALSE;
171 }
172
main(int argc,char ** argv)173 int main(int argc, char **argv)
174 {
175 GtkWidget *top_window, *outside_frame, *inside_frame, *progress_bar;
176
177 /* Must initialize libcurl before any threads are started */
178 curl_global_init(CURL_GLOBAL_ALL);
179
180 /* Init thread */
181 g_thread_init(NULL);
182 gdk_threads_init();
183 gdk_threads_enter();
184
185 gtk_init(&argc, &argv);
186
187 /* Base window */
188 top_window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
189
190 /* Frame */
191 outside_frame = gtk_frame_new(NULL);
192 gtk_frame_set_shadow_type(GTK_FRAME(outside_frame), GTK_SHADOW_OUT);
193 gtk_container_add(GTK_CONTAINER(top_window), outside_frame);
194
195 /* Frame */
196 inside_frame = gtk_frame_new(NULL);
197 gtk_frame_set_shadow_type(GTK_FRAME(inside_frame), GTK_SHADOW_IN);
198 gtk_container_set_border_width(GTK_CONTAINER(inside_frame), 5);
199 gtk_container_add(GTK_CONTAINER(outside_frame), inside_frame);
200
201 /* Progress bar */
202 progress_bar = gtk_progress_bar_new();
203 gtk_progress_bar_pulse(GTK_PROGRESS_BAR (progress_bar));
204 /* Make uniform pulsing */
205 gint pulse_ref = g_timeout_add(300, pulse_bar, progress_bar);
206 g_object_set_data(G_OBJECT(progress_bar), "pulse_id",
207 GINT_TO_POINTER(pulse_ref));
208 gtk_container_add(GTK_CONTAINER(inside_frame), progress_bar);
209
210 gtk_widget_show_all(top_window);
211 printf("gtk_widget_show_all\n");
212
213 g_signal_connect(G_OBJECT (top_window), "delete-event",
214 G_CALLBACK(cb_delete), NULL);
215
216 if(!g_thread_create(&create_thread, progress_bar, FALSE, NULL) != 0)
217 g_warning("can't create the thread");
218
219 gtk_main();
220 gdk_threads_leave();
221 printf("gdk_threads_leave\n");
222
223 return 0;
224 }
225