[vlc-devel] [PATCH v3 2/8] libvlc: player: fix racy tests

[Romain Vimont]

In order to wait for a specific state, libvlc player tests used live
loops to read the player state.

Listen to state changes instead.
---
 test/Makefile.am           |  2 +-
 test/libvlc/media_player.c | 85 ++++++++++++++++++++++++--------------
 2 files changed, 55 insertions(+), 32 deletions(-)

diff --git a/test/Makefile.am b/test/Makefile.am
index 8343bea501..625f8d3453 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -98,7 +98,7 @@ test_libvlc_media_list_player_LDADD = $(LIBVLC)
 test_libvlc_media_list_SOURCES = libvlc/media_list.c
 test_libvlc_media_list_LDADD = $(LIBVLC)
 test_libvlc_media_player_SOURCES = libvlc/media_player.c
-test_libvlc_media_player_LDADD = $(LIBVLC)
+test_libvlc_media_player_LDADD = $(LIBVLCCORE) $(LIBVLC)
 test_libvlc_media_discoverer_SOURCES = libvlc/media_discoverer.c
 test_libvlc_media_discoverer_LDADD = $(LIBVLC)
 test_libvlc_renderer_discoverer_SOURCES = libvlc/renderer_discoverer.c
diff --git a/test/libvlc/media_player.c b/test/libvlc/media_player.c
index 5417fd7561..2489e6f5fa 100644
--- a/test/libvlc/media_player.c
+++ b/test/libvlc/media_player.c
@@ -21,30 +21,61 @@
  **********************************************************************/
 
 #include "test.h"
+#include <vlc_common.h>
 
-static void wait_playing(libvlc_media_player_t *mp)
+static void on_event(const struct libvlc_event_t *event, void *data)
 {
-    libvlc_state_t state;
-    do {
-        state = libvlc_media_player_get_state (mp);
-    } while(state != libvlc_Playing &&
-            state != libvlc_Error &&
-            state != libvlc_Ended );
-
-    state = libvlc_media_player_get_state (mp);
-    assert(state == libvlc_Playing || state == libvlc_Ended);
+    (void) event;
+    vlc_sem_t *sem = data;
+    vlc_sem_post(sem);
 }
 
-static void wait_paused(libvlc_media_player_t *mp)
+static void play_and_wait(libvlc_media_player_t *mp)
 {
-    libvlc_state_t state;
-    do {
-        state = libvlc_media_player_get_state (mp);
-    } while(state != libvlc_Paused &&
-            state != libvlc_Ended );
-
-    state = libvlc_media_player_get_state (mp);
-    assert(state == libvlc_Paused || state == libvlc_Ended);
+    libvlc_event_manager_t *em = libvlc_media_player_event_manager(mp);
+
+    vlc_sem_t sem;
+    vlc_sem_init(&sem, 0);
+
+    int res;
+    res = libvlc_event_attach(em, libvlc_MediaPlayerPlaying, on_event, &sem);
+    assert(!res);
+
+    libvlc_media_player_play(mp);
+
+    test_log("Waiting for playing\n");
+    vlc_sem_wait(&sem);
+
+    libvlc_event_detach(em, libvlc_MediaPlayerPlaying, on_event, &sem);
+
+    vlc_sem_destroy(&sem);
+}
+
+static void pause_and_wait(libvlc_media_player_t *mp)
+{
+    libvlc_event_manager_t *em = libvlc_media_player_event_manager(mp);
+
+    vlc_sem_t sem;
+    vlc_sem_init(&sem, 0);
+
+    int res;
+    res = libvlc_event_attach(em, libvlc_MediaPlayerPaused, on_event, &sem);
+    assert(!res);
+    res = libvlc_event_attach(em, libvlc_MediaPlayerEndReached, on_event, &sem);
+    assert(!res);
+
+    libvlc_media_player_set_pause(mp, true);
+
+    /* the end may have been already reached before attaching the event */
+    if (libvlc_media_player_get_state(mp) == libvlc_Playing)
+    {
+        test_log("Waiting for pause\n");
+        vlc_sem_wait(&sem);
+    }
+
+    vlc_sem_destroy(&sem);
+    libvlc_event_detach(em, libvlc_MediaPlayerPaused, on_event, &sem);
+    libvlc_event_detach(em, libvlc_MediaPlayerEndReached, on_event, &sem);
 }
 
 /* Test a bunch of A/V properties. This most does nothing since the current
@@ -111,9 +142,7 @@ static void test_media_player_set_media(const char** argv, int argc)
 
     libvlc_media_release (md);
 
-    libvlc_media_player_play (mp);
-
-    wait_playing (mp);
+    play_and_wait(mp);
 
     libvlc_media_player_stop (mp);
     libvlc_media_player_release (mp);
@@ -140,9 +169,7 @@ static void test_media_player_play_stop(const char** argv, int argc)
 
     libvlc_media_release (md);
 
-    libvlc_media_player_play (mi);
-
-    wait_playing (mi);
+    play_and_wait(mi);
 
     libvlc_media_player_stop (mi);
     libvlc_media_player_release (mi);
@@ -172,14 +199,10 @@ static void test_media_player_pause_stop(const char** argv, int argc)
     test_audio_video(mi);
     test_role(mi);
 
-    libvlc_media_player_play (mi);
-    test_log ("Waiting for playing\n");
-    wait_playing (mi);
+    play_and_wait(mi);
     test_audio_video(mi);
 
-    libvlc_media_player_set_pause (mi, true);
-    test_log ("Waiting for pause\n");
-    wait_paused (mi);
+    pause_and_wait(mi);
     test_audio_video(mi);
 
     libvlc_media_player_stop (mi);
-- 
2.20.1