gio/tests/network-monitor-race.c

   1 /*
   2  * Copyright (C) 2018 Red Hat, Inc.
   3  *
   4  * This library is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU Lesser General Public License as
   6  * published by the Free Software Foundation; either version 2.1 of the
   7  * licence, or (at your option) any later version.
   8  *
   9  * This is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  12  * License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public License
  15  * along with this library; if not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <glib/glib.h>
  19 #include <gio/gio.h>
  20
  21 #define MAX_RUNS 20
  22
  23 static gboolean
  24 quit_loop (gpointer user_data)
  25 {
  26   g_main_loop_quit (user_data);
  27
  28   return FALSE;
  29 }
  30
  31 static gpointer
  32 thread_func (gpointer user_data)
  33 {
  34   g_network_monitor_get_default ();
  35   g_timeout_add (100, quit_loop, user_data);
  36
  37   return NULL;
  38 }
  39
  40 static gboolean
  41 call_func (gpointer user_data)
  42 {
  43   GThread *thread;
  44
  45   thread = g_thread_new (NULL, thread_func, user_data);
  46   g_thread_unref (thread);
  47
  48   return FALSE;
  49 }
  50
  51 /* Test that calling g_network_monitor_get_default() in a thread doesn’t cause
  52  * a crash. This is a probabilistic test; since it’s testing a race condition,
  53  * it can’t deterministically reproduce the problem. The threading has to
  54  * happen in subprocesses, since the result of g_network_monitor_get_default()
  55  * is unavoidably cached once created. */
  56 static void
  57 test_network_monitor (void)
  58 {
  59   guint ii;
  60
  61   g_test_bug ("793727");
  62
  63   if (g_test_subprocess ())
  64     {
  65        GMainLoop *main_loop;
  66
  67        main_loop = g_main_loop_new (NULL, FALSE);
  68        g_timeout_add (1, call_func, main_loop);
  69        g_main_loop_run (main_loop);
  70        g_main_loop_unref (main_loop);
  71
  72        return;
  73     }
  74
  75   for (ii = 0; ii < MAX_RUNS; ii++)
  76     {
  77        g_test_trap_subprocess (NULL, 0, 0);
  78        g_test_trap_assert_passed ();
  79     }
  80 }
  81
  82 int
  83 main (int argc, char *argv[])
  84 {
  85   g_test_init (&argc, &argv, NULL);
  86   g_test_bug_base ("https://bugzilla.gnome.org/show_bug.cgi?id=");
  87
  88   g_test_add_func ("/network-monitor/create-in-thread",
  89                    test_network_monitor);
  90
  91   return g_test_run ();
  92 }