display-test: test if threads are woken up on EAGAIN

When wl_connection_read() in wl_display_read_events() returns with EAGAIN,
we want the sleeping threads to be woken up. Test it!

Signed-off-by: Marek Chalupa <mchqwerty@gmail.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>

diff --git a/tests/display-test.c b/tests/display-test.c
index 451cabd..a1e45b1 100644 (file)
--- a/tests/display-test.c
+++ b/tests/display-test.c
@@ -495,6 +495,45 @@ TEST(threading_cancel_read_tst)
        display_destroy(d);
 }
 
+static void
+threading_read_eagain(void)
+{
+       struct client *c = client_connect();
+       pthread_t th1, th2, th3;
+
+       register_reading(c->wl_display);
+
+       th1 = create_thread(c, thread_prepare_and_read);
+       th2 = create_thread(c, thread_prepare_and_read);
+       th3 = create_thread(c, thread_prepare_and_read);
+
+       /* All the threads are sleeping, waiting until read or cancel
+        * is called. Since we have no data on socket waiting,
+        * the wl_connection_read should end up with error and set errno
+        * to EAGAIN. Check if the threads are woken up in this case. */
+       assert(wl_display_read_events(c->wl_display) == 0);
+       /* errno should be still set to EAGAIN if wl_connection_read
+        * set it - check if we're testing the right case */
+       assert(errno == EAGAIN);
+
+       alarm(3);
+       pthread_join(th1, NULL);
+       pthread_join(th2, NULL);
+       pthread_join(th3, NULL);
+
+       client_disconnect(c);
+}
+
+TEST(threading_read_eagain_tst)
+{
+       struct display *d = display_create();
+       client_create(d, threading_read_eagain);
+
+       display_run(d);
+
+       display_destroy(d);
+}
+
 static void *
 thread_prepare_and_read2(void *data)
 {