Branch data Line data Source code
1 : : #include <glib.h>
2 : : #ifdef G_OS_UNIX
3 : : #include <unistd.h>
4 : : #endif
5 : :
6 : : static GMainLoop *loop;
7 : :
8 : : static void
9 : 3 : stop_waiting (gpointer data)
10 : : {
11 : 3 : g_main_loop_quit (loop);
12 : 3 : }
13 : :
14 : : static gboolean
15 : 0 : unreachable_callback (gpointer data)
16 : : {
17 : : g_assert_not_reached ();
18 : :
19 : : return G_SOURCE_REMOVE;
20 : : }
21 : :
22 : : static void
23 : 0 : unreachable_void_callback (gpointer data)
24 : : {
25 : : g_assert_not_reached ();
26 : : }
27 : :
28 : : static void
29 : 1 : test_seconds (void)
30 : : {
31 : : guint id;
32 : :
33 : : /* Bug 642052 mentions that g_timeout_add_seconds(21475) schedules a
34 : : * job that runs once per second.
35 : : *
36 : : * Test that that isn't true anymore by scheduling two jobs:
37 : : * - one, as above
38 : : * - another that runs in 2100ms
39 : : *
40 : : * If everything is working properly, the 2100ms one should run first
41 : : * (and exit the mainloop). If we ever see the 21475 second job run
42 : : * then we have trouble (since it ran in less than 2 seconds).
43 : : *
44 : : * We need a timeout of at least 2 seconds because
45 : : * g_timeout_add_seconds() can add as much as an additional second of
46 : : * latency.
47 : : */
48 : 1 : g_test_bug ("https://bugzilla.gnome.org/show_bug.cgi?id=642052");
49 : 1 : loop = g_main_loop_new (NULL, FALSE);
50 : :
51 : 1 : g_timeout_add_once (2100, stop_waiting, NULL);
52 : 1 : id = g_timeout_add_seconds (21475, unreachable_callback, NULL);
53 : :
54 : 1 : g_main_loop_run (loop);
55 : 1 : g_main_loop_unref (loop);
56 : :
57 : 1 : g_source_remove (id);
58 : 1 : }
59 : :
60 : : static void
61 : 1 : test_seconds_once (void)
62 : : {
63 : : /* Use the same principle as in test_seconds() */
64 : 1 : loop = g_main_loop_new (NULL, FALSE);
65 : :
66 : 1 : g_timeout_add_once (2100, stop_waiting, NULL);
67 : 1 : g_timeout_add_seconds_once (21475, unreachable_void_callback, NULL);
68 : :
69 : 1 : g_main_loop_run (loop);
70 : 1 : g_main_loop_unref (loop);
71 : 1 : }
72 : :
73 : : static void
74 : 1 : test_weeks_overflow (void)
75 : : {
76 : : guint id;
77 : : guint interval_seconds;
78 : :
79 : : /* Internally, the guint interval (in seconds) was converted to milliseconds
80 : : * then stored in a guint variable. This meant that any interval larger than
81 : : * G_MAXUINT / 1000 would overflow.
82 : : *
83 : : * On a system with 32-bit guint, the interval (G_MAXUINT / 1000) + 1 seconds
84 : : * (49.7 days) would end wrapping to 704 milliseconds.
85 : : *
86 : : * Test that that isn't true anymore by scheduling two jobs:
87 : : * - one, as above
88 : : * - another that runs in 2100ms
89 : : *
90 : : * If everything is working properly, the 2100ms one should run first
91 : : * (and exit the mainloop). If we ever see the other job run
92 : : * then we have trouble (since it ran in less than 2 seconds).
93 : : *
94 : : * We need a timeout of at least 2 seconds because
95 : : * g_timeout_add_seconds() can add as much as an additional second of
96 : : * latency.
97 : : */
98 : 1 : g_test_bug ("https://gitlab.gnome.org/GNOME/glib/issues/1600");
99 : 1 : loop = g_main_loop_new (NULL, FALSE);
100 : :
101 : 1 : g_timeout_add_once (2100, stop_waiting, NULL);
102 : 1 : interval_seconds = 1 + G_MAXUINT / 1000;
103 : 1 : id = g_timeout_add_seconds (interval_seconds, unreachable_callback, NULL);
104 : :
105 : 1 : g_main_loop_run (loop);
106 : 1 : g_main_loop_unref (loop);
107 : :
108 : 1 : g_source_remove (id);
109 : 1 : }
110 : :
111 : : /* The ready_time for a GSource is stored as a gint64, as an absolute monotonic
112 : : * time in microseconds. To call poll(), this must be converted to a relative
113 : : * timeout, in milliseconds, as a gint. If the ready_time is sufficiently far
114 : : * in the future, the timeout will not fit. Previously, it would be narrowed in
115 : : * an implementation-defined way; if this gave a negative result, poll() would
116 : : * block forever.
117 : : *
118 : : * This test creates a GSource with the largest possible ready_time (a little
119 : : * over 292 millennia, assuming g_get_monotonic_time() starts from near 0 when
120 : : * the system boots), adds it to a GMainContext, queries it for the parameters
121 : : * to pass to poll() -- essentially the first half of
122 : : * g_main_context_iteration() -- and checks that the timeout is a large
123 : : * positive number.
124 : : */
125 : : static void
126 : 1 : test_far_future_ready_time (void)
127 : : {
128 : 1 : GSourceFuncs source_funcs = { 0 };
129 : 1 : GMainContext *context = g_main_context_new ();
130 : 1 : GSource *source = g_source_new (&source_funcs, sizeof (GSource));
131 : : gboolean acquired, ready;
132 : : gint priority, timeout_, n_fds;
133 : :
134 : 1 : g_source_set_ready_time (source, G_MAXINT64);
135 : 1 : g_source_attach (source, context);
136 : :
137 : 1 : acquired = g_main_context_acquire (context);
138 : 1 : g_assert_true (acquired);
139 : :
140 : 1 : ready = g_main_context_prepare (context, &priority);
141 : 1 : g_assert_false (ready);
142 : :
143 : 1 : n_fds = 0;
144 : 1 : n_fds = g_main_context_query (context, priority, &timeout_, NULL, n_fds);
145 : :
146 : 1 : g_assert_cmpint (n_fds, >=, 0);
147 : :
148 : : /* The true timeout in milliseconds doesn't fit into a gint. We definitely
149 : : * don't want poll() to block forever:
150 : : */
151 : 1 : g_assert_cmpint (timeout_, >=, 0);
152 : : /* Instead, we want it to block for as long as possible: */
153 : 1 : g_assert_cmpint (timeout_, ==, G_MAXINT);
154 : :
155 : 1 : g_main_context_release (context);
156 : 1 : g_main_context_unref (context);
157 : 1 : g_source_unref (source);
158 : 1 : }
159 : :
160 : : static gint64 last_time;
161 : : static gint count;
162 : :
163 : : static gboolean
164 : 10 : test_func (gpointer data)
165 : : {
166 : : gint64 current_time;
167 : :
168 : 10 : current_time = g_get_monotonic_time ();
169 : :
170 : : /* We accept 2 on the first iteration because _add_seconds() can
171 : : * have an initial latency of 1 second, see its documentation.
172 : : *
173 : : * Allow up to 500ms leeway for rounding and scheduling.
174 : : */
175 [ + + ]: 10 : if (count == 0)
176 : 1 : g_assert_cmpint (current_time / 1000 - last_time / 1000, <=, 2500);
177 : : else
178 : 9 : g_assert_cmpint (current_time / 1000 - last_time / 1000, <=, 1500);
179 : :
180 : 10 : last_time = current_time;
181 : 10 : count++;
182 : :
183 : : /* Make the timeout take up to 0.1 seconds.
184 : : * We should still get scheduled for the next second.
185 : : */
186 : 10 : g_usleep (count * 10000);
187 : :
188 [ + + ]: 10 : if (count < 10)
189 : 9 : return TRUE;
190 : :
191 : 1 : g_main_loop_quit (loop);
192 : :
193 : 1 : return FALSE;
194 : : }
195 : :
196 : : static void
197 : 1 : test_rounding (void)
198 : : {
199 : 1 : loop = g_main_loop_new (NULL, FALSE);
200 : :
201 : 1 : last_time = g_get_monotonic_time ();
202 : 1 : g_timeout_add_seconds (1, test_func, NULL);
203 : :
204 : 1 : g_main_loop_run (loop);
205 : 1 : g_main_loop_unref (loop);
206 : 1 : }
207 : :
208 : : int
209 : 1 : main (int argc, char *argv[])
210 : : {
211 : 1 : g_test_init (&argc, &argv, NULL);
212 : :
213 : 1 : g_test_add_func ("/timeout/seconds", test_seconds);
214 : 1 : g_test_add_func ("/timeout/seconds-once", test_seconds_once);
215 : 1 : g_test_add_func ("/timeout/weeks-overflow", test_weeks_overflow);
216 : 1 : g_test_add_func ("/timeout/far-future-ready-time", test_far_future_ready_time);
217 : 1 : g_test_add_func ("/timeout/rounding", test_rounding);
218 : :
219 : 1 : return g_test_run ();
220 : : }
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