Hello mpd developers,
after using mpd for quite some time I would like to contribute a little to
its development.
Under certain circumstances, on linux systems OutputThread fails to get
realtime scheduling. I think it would be useful to inform the user when
this happens. Therefore I'm submitting 2 patches.
Patch 1/2. Check the return value of sched_setscheduler() in
SetThreadRealtime. Report to the caller, if we were successful. To this end
SetThreadRealtime now returns false, if ached_setschedluer failed or true
on all other cases. On non-linux systems SetThreadRealtime does not do
anything and will always return true.
Patch 2/2. In OutputThread (seems to be the only caller of
SetThreadRelatime) the return value is checked. If SetThreadRealtime
failed, a warning is logged using LogWarning. I decide to put LogWarning
here, since the caller of SetThreadRealtime should decide how to handle
this.
Please let me know what you think about this.
Best,
Christian Halaszovich
---
src/thread/Util.hxx | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/src/thread/Util.hxx b/src/thread/Util.hxx
index ff8dbbe..5e63e44 100644
--- a/src/thread/Util.hxx
+++ b/src/thread/Util.hxx
@@ -81,10 +81,12 @@ SetThreadIdlePriority()
/**
* Raise the current thread's priority to "real-time" (very high).
+ * return value: true on success
*/
-static inline void
+static inline bool
SetThreadRealtime()
{
+ bool success = true;
#ifdef __linux__
struct sched_param sched_param;
sched_param.sched_priority = 50;
@@ -94,8 +96,9 @@ SetThreadRealtime()
policy |= SCHED_RESET_ON_FORK;
#endif
- sched_setscheduler(0, policy, &sched_param);
+ success = 0==sched_setscheduler(0, policy, &sched_param);
#endif
+ return success; // on non-linux machines we will always pretend it worked
};
#endif
--
1.9.1
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