Updates for SCHED_RR in ALSA API, plus support in configure for powerpc64 (gs).

1 files changed, 15 insertions, 8 deletions

diff --git a/RtAudio.cpp b/RtAudio.cpp
index 8477ef9..68dabff 100644
--- a/RtAudio.cpp
+++ b/RtAudio.cpp
@@ -5881,22 +5881,21 @@ bool RtApiAlsa :: probeDeviceOpen( unsigned int device, StreamMode mode, unsigne
     pthread_attr_t attr;

     pthread_attr_init( &attr );

     pthread_attr_setdetachstate( &attr, PTHREAD_CREATE_JOINABLE );

+

 #ifdef SCHED_RR // Undefined with some OSes (eg: NetBSD 1.6.x with GNU Pthread)

     if ( options && options->flags & RTAUDIO_SCHEDULE_REALTIME ) {

-      struct sched_param param;

+      // We previously attempted to increase the audio callback priority

+      // to SCHED_RR here via the attributes.  However, while no errors

+      // were reported in doing so, it did not work.  So, now this is

+      // done in the alsaCallbackHandler function.

+      stream_.callbackInfo.doRealtime = true;

       int priority = options->priority;

       int min = sched_get_priority_min( SCHED_RR );

       int max = sched_get_priority_max( SCHED_RR );

       if ( priority < min ) priority = min;

       else if ( priority > max ) priority = max;

-      param.sched_priority = priority;

-      pthread_attr_setschedpolicy( &attr, SCHED_RR );

-      pthread_attr_setschedparam( &attr, &param );

+      stream_.callbackInfo.priority = priority;

     }

-    else

-      pthread_attr_setschedpolicy( &attr, SCHED_OTHER );

-#else

-    pthread_attr_setschedpolicy( &attr, SCHED_OTHER );

 #endif

 

     stream_.callbackInfo.isRunning = true;

@@ -6314,6 +6313,14 @@ extern "C" void *alsaCallbackHandler( void *ptr )
   RtApiAlsa *object = (RtApiAlsa *) info->object;

   bool *isRunning = &info->isRunning;

 

+#ifdef SCHED_RR // Undefined with some OSes (eg: NetBSD 1.6.x with GNU Pthread)

+  if ( &info->doRealtime ) {

+    pthread_t tID = pthread_self();	 // ID of this thread

+    sched_param prio = { info->priority }; // scheduling priority of thread

+    pthread_setschedparam( tID, SCHED_RR, &prio );

+  }

+#endif

+

   while ( *isRunning == true ) {

     pthread_testcancel();

     object->callbackEvent();