nexmon – Blame information for rev 1

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1 office 1 /*
2 * Author: Simon McVittie <simon.mcvittie@collabora.co.uk>
3 * Copyright © 2011 Nokia Corporation
4 *
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU Lesser General Public License as
7 * published by the Free Software Foundation; either version 2 of the
8 * License, or (at your option) any later version.
9 *
10 * See the included COPYING file for more information.
11 */
12  
13 #define GLIB_DISABLE_DEPRECATION_WARNINGS
14  
15 #include <glib.h>
16  
17 /* On smcv's laptop, 1e4 iterations didn't always exhibit the bug, but 1e5
18 * iterations exhibited it 10/10 times in practice. YMMV. */
19 #define ITERATIONS 100000
20  
21 static GStaticPrivate sp;
22 static GMutex *mutex;
23 static GCond *cond;
24 static guint i;
25  
26 static volatile gint freed = 0;
27  
28 static void
29 notify (gpointer p)
30 {
31 if (!g_atomic_int_compare_and_exchange (&freed, 0, 1))
32 {
33 g_error ("someone already freed it after %u iterations", i);
34 }
35 }
36  
37 static gpointer thread_func (gpointer nil)
38 {
39 /* wait for main thread to reach its g_cond_wait call */
40 g_mutex_lock (mutex);
41  
42 g_static_private_set (&sp, &sp, notify);
43 g_cond_broadcast (cond);
44 g_mutex_unlock (mutex);
45  
46 return nil;
47 }
48  
49 static void
50 testcase (void)
51 {
52 g_test_bug ("642026");
53  
54 mutex = g_mutex_new ();
55 cond = g_cond_new ();
56  
57 g_mutex_lock (mutex);
58  
59 for (i = 0; i < ITERATIONS; i++)
60 {
61 GThread *t1;
62  
63 g_static_private_init (&sp);
64 freed = 0;
65  
66 t1 = g_thread_create (thread_func, NULL, TRUE, NULL);
67  
68 /* wait for t1 to set up its thread-private data */
69 g_cond_wait (cond, mutex);
70  
71 /* exercise the bug, by racing with t1 to free the private data */
72 g_static_private_free (&sp);
73 g_thread_join (t1);
74 }
75  
76 g_cond_free (cond);
77 g_mutex_unlock (mutex);
78 g_mutex_free (mutex);
79 }
80  
81 int
82 main (int argc,
83 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 ("/glib/642026", testcase);
89  
90 return g_test_run ();
91 }