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

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();

RtAudio.h

@@ -537,10 +537,12 @@ struct CallbackInfo {
   void *userData;
   void *apiInfo;   // void pointer for API specific callback information
   bool isRunning;
+  bool doRealtime;
+  int priority;
 
   // Default constructor.
   CallbackInfo()
-    :object(0), callback(0), userData(0), apiInfo(0), isRunning(false) {}
+  :object(0), callback(0), userData(0), apiInfo(0), isRunning(false), doRealtime(false) {}
 };
 
 // **************************************************************** //

config/config.sub

@@ -3,7 +3,7 @@
 #   Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
 #   Free Software Foundation, Inc.
 
-timestamp='2004-02-26'
+timestamp='2012-11-19'
 
 # This file is (in principle) common to ALL GNU software.
 # The presence of a machine in this file suggests that SOME GNU software
@@ -225,7 +225,7 @@ case $basic_machine in
 		| alpha | alphaev[4-8] | alphaev56 | alphapca5[67] \
 		| alphaev6[78] \
 		| we32k | ns16k | clipper | i370 | sh | sh[34] \
-		| powerpc | powerpcle \
+		| powerpc | powerpc64 | powerpcle \
 		| 1750a | dsp16xx | pdp10 | pdp11 \
 		| mips16 | mips64 | mipsel | mips64el \
 		| mips64orion | mips64orionel | mipstx39 | mipstx39el \
@@ -271,7 +271,7 @@ case $basic_machine in
 	      | alphaev6[78]-* \
 	      | we32k-* | cydra-* | ns16k-* | pn-* | np1-* | xps100-* \
 	      | clipper-* | orion-* \
-	      | sparclite-* | pdp10-* | pdp11-* | sh-* | powerpc-* | powerpcle-* \
+	      | sparclite-* | pdp10-* | pdp11-* | sh-* | powerpc-* | powerpc64-* | powerpcle-* \
 	      | sparc64-* | sparcv9-* | sparcv9b-* | sparc86x-* \
 	      | mips16-* | mips64-* | mipsel-* \
 	      | mips64el-* | mips64orion-* | mips64orionel-* \
@@ -721,6 +721,10 @@ case $basic_machine in
 	        ;;
 	ppc-*)	basic_machine=powerpc-`echo $basic_machine | sed 's/^[^-]*-//'`
 		;;
+	ppc64)	basic_machine=powerpc64-unknown
+	        ;;
+	ppc64-*)	basic_machine=powerpc64-`echo $basic_machine | sed 's/^[^-]*-//'`
+		;;
 	ppcle | powerpclittle | ppc-le | powerpc-little)
 		basic_machine=powerpcle-unknown
 	        ;;