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test: Potentially fix a race in thread-pool-slow test

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It’s failed on a CI machine
(https://gitlab.gnome.org/GNOME/glib/-/jobs/2006694) with log:
```
[unused] => pushed 100 threads onto the idle pool
[unused] stopping unused threads
[unused] waiting ONE second for threads to die
[unused] waiting ONE second for threads to die
[unused] waiting ONE second for threads to die
[unused] waiting ONE second for threads to die
[unused] waiting ONE second for threads to die
[unused] stopped idle threads, 9 remain
Bail out! GLib:ERROR:../glib/tests/thread-pool-slow.c:113:test_thread_stop_unused: assertion failed (g_thread_pool_get_num_unused_threads () == 0): (9 == 0)
```

I can’t reproduce this locally, but it’s possible that it failed because
a one second wait was not enough to enqueue all the jobs (on a heavily
loaded machine), and hence some jobs spawned thread pool threads after
calling `g_thread_pool_stop_unused_threads()`, leading to the assertion
failure.

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>
This commit is contained in:
Philip Withnall 2022-05-18 15:37:19 +01:00
parent 89b1fe42d7
commit afc0883652
1 changed files with 16 additions and 2 deletions
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18
glib/tests/thread-pool-slow.c
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@ -61,22 +61,36 @@ test_thread_functions (void)
g_assert_cmpint (g_thread_pool_get_max_idle_time (), ==, 0);
}
static void
thread_wait_func (gpointer data,
gpointer user_data)
{
guint timeout_ms = GPOINTER_TO_UINT (data);
guint *n_threads_executed = user_data;
g_usleep (timeout_ms);
g_atomic_int_inc (n_threads_executed);
}
static void
test_thread_stop_unused (void)
{
GThreadPool *pool;
guint i;
guint limit = 100;
guint n_threads_executed = 0;
/* Spawn a few threads. */
g_thread_pool_set_max_unused_threads (-1);
pool = g_thread_pool_new ((GFunc) g_usleep, NULL, -1, FALSE, NULL);
pool = g_thread_pool_new (thread_wait_func, &n_threads_executed, -1, FALSE, NULL);
for (i = 0; i < limit; i++)
g_thread_pool_push (pool, GUINT_TO_POINTER (1000), NULL);
/* Wait for the threads to migrate. */
g_usleep (G_USEC_PER_SEC);
while ((guint) g_atomic_int_get (&n_threads_executed) < limit)
g_usleep (100);
g_thread_pool_stop_unused_threads ();