port: experimental multithreaded audio

port/include/audio.h

@@ -6,7 +6,6 @@
 s32 audioInit(void);
 s32 audioGetBytesBuffered(void);
 s32 audioGetSamplesBuffered(void);
-void audioSetNextBuffer(const s16 *buf, u32 len);
-void audioEndFrame(void);
+void audioSubmitBuffer(const s16 *buf, u32 size);
 
 #endif

port/include/system.h

@@ -35,7 +35,11 @@ void *sysMemZeroAlloc(const u32 size);
 void sysMemFree(void *ptr);
 
 // hns is specified in 100ns units
-void sysSleep(const s64 hns);
+// do not use sysFrameLimiterSleep on any thread other than the main one
+void sysFrameLimiterSleep(const s64 hns);
+
+// us is specified in microseconds
+void sysSleep(const s64 us);
 
 // yield CPU if supported (e.g. during a busy loop)
 void sysCpuRelax(void);

port/include/thread.h

@@ -0,0 +1,27 @@
+#ifndef _IN_THREAD_H
+#define _IN_THREAD_H
+
+#include <PR/ultratypes.h>
+#include "platform.h"
+
+// TODO: backends
+#ifndef PLATFORM_USE_PTHREAD
+#error "No available thread backend."
+#endif
+
+#include <pthread.h>
+
+#define SYSMUTEX_STATIC_INIT PTHREAD_MUTEX_INITIALIZER
+
+typedef pthread_t systhread;
+typedef pthread_mutex_t sysmutex;
+
+typedef void *(*systhreadfn)(void *);
+
+s32 sysThreadCreate(systhread *thread, systhreadfn func, void *arg);
+s32 sysThreadJoin(systhread *thread, void **result);
+
+void sysMutexLock(sysmutex *mtx);
+void sysMutexUnlock(sysmutex *mtx);
+
+#endif // _IN_THREAD_H