Annotation of embedaddon/curl/docs/examples/smooth-gtk-thread.c, revision 1.1.1.1
1.1 misho 1: /***************************************************************************
2: * _ _ ____ _
3: * Project ___| | | | _ \| |
4: * / __| | | | |_) | |
5: * | (__| |_| | _ <| |___
6: * \___|\___/|_| \_\_____|
7: *
8: * Copyright (C) 1998 - 2019, 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:
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 */
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:
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:
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:
167: static gboolean cb_delete(GtkWidget *window, gpointer data)
168: {
169: gtk_main_quit();
170: return FALSE;
171: }
172:
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: }
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