[pulseaudio-discuss] [PATCH] mainloop, glib-mainloop: time_restart could cause incorrect event ordering

[Ben Brewer]

From: Ben Brewer <benbrewer at codethink.co.uk>

This fixes a bug where calling time_restart can leave the current event
in the cache, even though the restart scheduled the event in the future.
This would cause the event to get executed more frequently than it should.
---
 src/pulse/glib-mainloop.c |    6 ++++--
 src/pulse/mainloop.c      |    6 ++++--
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/src/pulse/glib-mainloop.c b/src/pulse/glib-mainloop.c
index bd24913..34f3556 100644
--- a/src/pulse/glib-mainloop.c
+++ b/src/pulse/glib-mainloop.c
@@ -328,13 +328,15 @@ static void glib_time_restart(pa_time_event*e, const struct timeval *tv) {
     if ((e->enabled = !!tv))
         e->timeval = *tv;
 
+    if (e->mainloop->cached_next_time_event == e)
+        e->mainloop->cached_next_time_event = NULL;
+
     if (e->mainloop->cached_next_time_event && e->enabled) {
         g_assert(e->mainloop->cached_next_time_event->enabled);
 
         if (pa_timeval_cmp(tv, &e->mainloop->cached_next_time_event->timeval) < 0)
             e->mainloop->cached_next_time_event = e;
-    } else if (e->mainloop->cached_next_time_event == e)
-        e->mainloop->cached_next_time_event = NULL;
+    }
 }
 
 static void glib_time_free(pa_time_event *e) {
diff --git a/src/pulse/mainloop.c b/src/pulse/mainloop.c
index 60fbbb9..0e1fba0 100644
--- a/src/pulse/mainloop.c
+++ b/src/pulse/mainloop.c
@@ -379,13 +379,15 @@ static void mainloop_time_restart(pa_time_event *e, const struct timeval *tv) {
         pa_mainloop_wakeup(e->mainloop);
     }
 
+    if (e->mainloop->cached_next_time_event == e)
+        e->mainloop->cached_next_time_event = NULL;
+
     if (e->mainloop->cached_next_time_event && e->enabled) {
         pa_assert(e->mainloop->cached_next_time_event->enabled);
 
         if (t < e->mainloop->cached_next_time_event->time)
             e->mainloop->cached_next_time_event = e;
-    } else if (e->mainloop->cached_next_time_event == e)
-        e->mainloop->cached_next_time_event = NULL;
+    }
 }
 
 static void mainloop_time_free(pa_time_event *e) {
-- 
1.7.9.5