1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2017, 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.haxx.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 CURL *curl;
71 CURLcode res;
72 gchar *http;
73 FILE *outfile;
74
75 /* Stop threads from entering unless j is incremented */
76 pthread_mutex_lock(&lock);
77 while(j < num_urls) {
78 printf("j = %d\n", j);
79
80 http =
81 g_strdup_printf("xoap.weather.com/weather/local/%s?cc=*&dayf=5&unit=i\n",
82 urls[j]);
83
84 printf("http %s", http);
85
86 curl = curl_easy_init();
87 if(curl) {
88
89 outfile = fopen(urls[j], "wb");
90
91 /* Set the URL and transfer type */
92 curl_easy_setopt(curl, CURLOPT_URL, http);
93
94 /* Write to the file */
95 curl_easy_setopt(curl, CURLOPT_WRITEDATA, outfile);
96 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_file);
97
98 j++; /* critical line */
99 pthread_mutex_unlock(&lock);
100
101 res = curl_easy_perform(curl);
102
103 fclose(outfile);
104 printf("fclose\n");
105
106 curl_easy_cleanup(curl);
107 }
108 g_free(http);
109
110 /* Adds more latency, testing the mutex.*/
111 sleep(1);
112
113 } /* end while */
114 return NULL;
115 }
116
117
pulse_bar(gpointer data)118 gboolean pulse_bar(gpointer data)
119 {
120 gdk_threads_enter();
121 gtk_progress_bar_pulse(GTK_PROGRESS_BAR (data));
122 gdk_threads_leave();
123
124 /* Return true so the function will be called again;
125 * returning false removes this timeout function.
126 */
127 return TRUE;
128 }
129
create_thread(void * progress_bar)130 void *create_thread(void *progress_bar)
131 {
132 pthread_t tid[NUMT];
133 int i;
134 int error;
135
136 /* Make sure I don't create more threads than urls. */
137 for(i = 0; i < NUMT && i < num_urls ; i++) {
138 error = pthread_create(&tid[i],
139 NULL, /* default attributes please */
140 pull_one_url,
141 NULL);
142 if(0 != error)
143 fprintf(stderr, "Couldn't run thread number %d, errno %d\n", i, error);
144 else
145 fprintf(stderr, "Thread %d, gets %s\n", i, urls[i]);
146 }
147
148 /* Wait for all threads to terminate. */
149 for(i = 0; i < NUMT && i < num_urls; i++) {
150 error = pthread_join(tid[i], NULL);
151 fprintf(stderr, "Thread %d terminated\n", i);
152 }
153
154 /* This stops the pulsing if you have it turned on in the progress bar
155 section */
156 g_source_remove(GPOINTER_TO_INT(g_object_get_data(G_OBJECT(progress_bar),
157 "pulse_id")));
158
159 /* This destroys the progress bar */
160 gtk_widget_destroy(progress_bar);
161
162 /* [Un]Comment this out to kill the program rather than pushing close. */
163 /* gtk_main_quit(); */
164
165
166 return NULL;
167
168 }
169
cb_delete(GtkWidget * window,gpointer data)170 static gboolean cb_delete(GtkWidget *window, gpointer data)
171 {
172 gtk_main_quit();
173 return FALSE;
174 }
175
main(int argc,char ** argv)176 int main(int argc, char **argv)
177 {
178 GtkWidget *top_window, *outside_frame, *inside_frame, *progress_bar;
179
180 /* Must initialize libcurl before any threads are started */
181 curl_global_init(CURL_GLOBAL_ALL);
182
183 /* Init thread */
184 g_thread_init(NULL);
185 gdk_threads_init();
186 gdk_threads_enter();
187
188 gtk_init(&argc, &argv);
189
190 /* Base window */
191 top_window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
192
193 /* Frame */
194 outside_frame = gtk_frame_new(NULL);
195 gtk_frame_set_shadow_type(GTK_FRAME(outside_frame), GTK_SHADOW_OUT);
196 gtk_container_add(GTK_CONTAINER(top_window), outside_frame);
197
198 /* Frame */
199 inside_frame = gtk_frame_new(NULL);
200 gtk_frame_set_shadow_type(GTK_FRAME(inside_frame), GTK_SHADOW_IN);
201 gtk_container_set_border_width(GTK_CONTAINER(inside_frame), 5);
202 gtk_container_add(GTK_CONTAINER(outside_frame), inside_frame);
203
204 /* Progress bar */
205 progress_bar = gtk_progress_bar_new();
206 gtk_progress_bar_pulse(GTK_PROGRESS_BAR (progress_bar));
207 /* Make uniform pulsing */
208 gint pulse_ref = g_timeout_add(300, pulse_bar, progress_bar);
209 g_object_set_data(G_OBJECT(progress_bar), "pulse_id",
210 GINT_TO_POINTER(pulse_ref));
211 gtk_container_add(GTK_CONTAINER(inside_frame), progress_bar);
212
213 gtk_widget_show_all(top_window);
214 printf("gtk_widget_show_all\n");
215
216 g_signal_connect(G_OBJECT (top_window), "delete-event",
217 G_CALLBACK(cb_delete), NULL);
218
219 if(!g_thread_create(&create_thread, progress_bar, FALSE, NULL) != 0)
220 g_warning("can't create the thread");
221
222 gtk_main();
223 gdk_threads_leave();
224 printf("gdk_threads_leave\n");
225
226 return 0;
227 }
228