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Merge branch 'timer-test-fix' into 'main'

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tests: Fix an intermittent timing error with testing g_usleep(0)

See merge request GNOME/glib!3472
This commit is contained in:
Emmanuele Bassi 2023-06-21 11:06:04 +00:00
commit 43e133723c
1 changed files with 22 additions and 10 deletions
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32
glib/tests/timer.c
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@ -350,21 +350,33 @@ static void
test_usleep_with_zero_wait (void) test_usleep_with_zero_wait (void)
{ {
GTimer *timer; GTimer *timer;
gdouble elapsed0, elapsed1; unsigned int n_times_shorter = 0;
timer = g_timer_new (); timer = g_timer_new ();
g_timer_start (timer); /* Test that g_usleep(0) sleeps for less time than g_usleep(1). We can’t
g_usleep (0); * actually guarantee this, since the exact length of g_usleep(1) is not
elapsed0 = g_timer_elapsed (timer, NULL); * guaranteed, but we can say that it probably should be longer 9 times out
g_timer_stop (timer); * of 10. */
for (unsigned int i = 0; i < 10; i++)
{
gdouble elapsed0, elapsed1;
g_timer_start (timer); g_timer_start (timer);
g_usleep (1); g_usleep (0);
elapsed1 = g_timer_elapsed (timer, NULL); elapsed0 = g_timer_elapsed (timer, NULL);
g_timer_stop (timer); g_timer_stop (timer);
g_assert_cmpfloat (elapsed0, <=, elapsed1); g_timer_start (timer);
g_usleep (1);
elapsed1 = g_timer_elapsed (timer, NULL);
g_timer_stop (timer);
if (elapsed0 <= elapsed1)
n_times_shorter++;
}
g_assert_cmpuint (n_times_shorter, >=, 9);
g_clear_pointer (&timer, g_timer_destroy); g_clear_pointer (&timer, g_timer_destroy);
} }