port: experimental multithreaded audio

src/include/lib/audiomgr.h

@@ -17,7 +17,12 @@ OSMesgQueue *amgrGetFrameMesgQueue(void);
 void amgrStopThread(void);
 
 #ifndef PLATFORM_N64
-void amgrFrame(void);
+void amgrLock(void);
+void amgrUnlock(void);
+void amgrUpdateFrameCounter(u32 framecount);
+#else
+#define amgrLock() do {} while(0)
+#define amgrUnlock() do {} while(0)
 #endif
 
 #endif

src/include/platform.h

@@ -34,6 +34,9 @@
 	#error "64-bit platforms are currently not supported."
 #endif
 
+// threading backend
+#define PLATFORM_USE_PTHREAD 1
+
 // detect endianness
 #if defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__)
 	#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__