1/***************************************************************************
2 *                                  _   _ ____  _
3 *  Project                     ___| | | |  _ \| |
4 *                             / __| | | | |_) | |
5 *                            | (__| |_| |  _ <| |___
6 *                             \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2011, 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 http://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/* This is a multi threaded application that uses a progress bar to show
23 * status.  It uses Gtk+ to make a smooth pulse.
24 *
25 * Written by Jud Bishop after studying the other examples provided with
26 * libcurl.
27 *
28 * To compile (on a single line):
29 * gcc -ggdb `pkg-config --cflags  --libs gtk+-2.0` -lcurl -lssl -lcrypto
30 *   -lgthread-2.0 -dl  smooth-gtk-thread.c -o smooth-gtk-thread
31 */
32
33#include <stdio.h>
34#include <gtk/gtk.h>
35#include <glib.h>
36#include <unistd.h>
37#include <pthread.h>
38
39#include <curl/curl.h>
40
41#define NUMT 4
42
43pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
44int j = 0;
45gint num_urls = 9; /* Just make sure this is less than urls[]*/
46const char * const urls[]= {
47  "90022",
48  "90023",
49  "90024",
50  "90025",
51  "90026",
52  "90027",
53  "90028",
54  "90029",
55  "90030"
56};
57
58size_t write_file(void *ptr, size_t size, size_t nmemb, FILE *stream)
59{
60  /* printf("write_file\n"); */
61  return fwrite(ptr, size, nmemb, stream);
62}
63
64/* http://xoap.weather.com/weather/local/46214?cc=*&dayf=5&unit=i */
65void *pull_one_url(void *NaN)
66{
67  CURL *curl;
68  CURLcode res;
69  gchar *http;
70  FILE *outfile;
71
72  /* Stop threads from entering unless j is incremented */
73  pthread_mutex_lock(&lock);
74  while ( j < num_urls )
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
88      outfile = fopen(urls[j], "w");
89      /* printf("fopen\n"); */
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
118gboolean 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
130void *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
170static gboolean cb_delete(GtkWidget *window, gpointer data)
171{
172  gtk_main_quit();
173  return FALSE;
174}
175
176int 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
229