The first commit

src/done/yieldthread.c

@@ -0,0 +1,9 @@
+#include <ultra64.h>
+#include "osint.h"
+
+void osYieldThread(void){
+    register u32 saveMask = __osDisableInt();
+    __osRunningThread->state = OS_STATE_RUNNABLE;
+    __osEnqueueAndYield(&__osRunQueue);
+    __osRestoreInt(saveMask);
+}