move files, still need to fix exports and compile errors

src/util/util.go

@@ -0,0 +1,49 @@
+package yggdrasil
+
+// These are misc. utility functions that didn't really fit anywhere else
+
+import "runtime"
+
+// A wrapper around runtime.Gosched() so it doesn't need to be imported elsewhere.
+func util_yield() {
+	runtime.Gosched()
+}
+
+// A wrapper around runtime.LockOSThread() so it doesn't need to be imported elsewhere.
+func util_lockthread() {
+	runtime.LockOSThread()
+}
+
+// A wrapper around runtime.UnlockOSThread() so it doesn't need to be imported elsewhere.
+func util_unlockthread() {
+	runtime.UnlockOSThread()
+}
+
+// This is used to buffer recently used slices of bytes, to prevent allocations in the hot loops.
+// It's used like a sync.Pool, but with a fixed size and typechecked without type casts to/from interface{} (which were making the profiles look ugly).
+var byteStore chan []byte
+
+// Initializes the byteStore
+func util_initByteStore() {
+	if byteStore == nil {
+		byteStore = make(chan []byte, 32)
+	}
+}
+
+// Gets an empty slice from the byte store, if one is available, or else returns a new nil slice.
+func util_getBytes() []byte {
+	select {
+	case bs := <-byteStore:
+		return bs[:0]
+	default:
+		return nil
+	}
+}
+
+// Puts a slice in the store, if there's room, or else returns and lets the slice get collected.
+func util_putBytes(bs []byte) {
+	select {
+	case byteStore <- bs:
+	default:
+	}
+}