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systemclock: Use a flag while waiting for the async thread to start

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Otherwise there can be spurious wakeups.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/7994>
This commit is contained in:
Sebastian Dröge 2024-11-28 15:25:47 +02:00 committed by GStreamer Marge Bot
parent 3cdc14df99
commit 37b9bfdd2e
1 changed files with 6 additions and 1 deletions
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7
subprojects/gstreamer/gst/gstsystemclock.c
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@ -571,6 +571,7 @@ ensure_entry_initialized (GstClockEntryImpl * entry_impl)
struct _GstSystemClockPrivate struct _GstSystemClockPrivate
{ {
GThread *thread; /* thread for async notify */ GThread *thread; /* thread for async notify */
gboolean starting;
gboolean stopping; gboolean stopping;
GList *entries; GList *entries;
@ -875,6 +876,7 @@ gst_system_clock_async_thread (GstClock * clock)
GST_CAT_DEBUG_OBJECT (GST_CAT_CLOCK, clock, "enter system clock thread"); GST_CAT_DEBUG_OBJECT (GST_CAT_CLOCK, clock, "enter system clock thread");
GST_SYSTEM_CLOCK_LOCK (clock); GST_SYSTEM_CLOCK_LOCK (clock);
/* signal spinup */ /* signal spinup */
priv->starting = FALSE;
GST_SYSTEM_CLOCK_BROADCAST (clock); GST_SYSTEM_CLOCK_BROADCAST (clock);
/* now enter our (almost) infinite loop */ /* now enter our (almost) infinite loop */
while (!priv->stopping) { while (!priv->stopping) {
@ -1316,6 +1318,7 @@ gst_system_clock_start_async (GstSystemClock * clock)
if (G_LIKELY (priv->thread != NULL)) if (G_LIKELY (priv->thread != NULL))
return TRUE; /* Thread already running. Nothing to do */ return TRUE; /* Thread already running. Nothing to do */
priv->starting = TRUE;
priv->thread = g_thread_try_new ("GstSystemClock", priv->thread = g_thread_try_new ("GstSystemClock",
(GThreadFunc) gst_system_clock_async_thread, clock, &error); (GThreadFunc) gst_system_clock_async_thread, clock, &error);
@ -1323,13 +1326,15 @@ gst_system_clock_start_async (GstSystemClock * clock)
goto no_thread; goto no_thread;
/* wait for it to spin up */ /* wait for it to spin up */
GST_SYSTEM_CLOCK_WAIT (clock); while (priv->starting)
GST_SYSTEM_CLOCK_WAIT (clock);
return TRUE; return TRUE;
/* ERRORS */ /* ERRORS */
no_thread: no_thread:
{ {
priv->starting = FALSE;
g_warning ("could not create async clock thread: %s", error->message); g_warning ("could not create async clock thread: %s", error->message);
g_error_free (error); g_error_free (error);
} }