first code/readme/license commit

src/yggdrasil/util.go

@@ -0,0 +1,79 @@
+package yggdrasil
+
+// These are misc. utility functions that didn't really fit anywhere else
+
+import "fmt"
+import "runtime"
+//import "sync"
+
+func Util_testAddrIDMask() {
+  for idx := 0 ; idx < 16 ; idx++ {
+    var orig NodeID
+    orig[8] = 42
+    for bidx := 0 ; bidx < idx ; bidx++ {
+      orig[bidx/8] |= (0x80 >> uint8(bidx % 8))
+    }
+    addr := address_addrForNodeID(&orig)
+    nid, mask := addr.getNodeIDandMask()
+    for b := 0 ; b < len(mask) ; b++ {
+      nid[b] &= mask[b]
+      orig[b] &= mask[b]
+    }
+    if *nid != orig {
+      fmt.Println(orig)
+      fmt.Println(*addr)
+      fmt.Println(*nid)
+      fmt.Println(*mask)
+      panic(idx)
+    }
+  }
+}
+
+func util_yield() {
+  runtime.Gosched()
+}
+
+func util_lockthread() {
+  runtime.LockOSThread()
+}
+
+func util_unlockthread() {
+  runtime.UnlockOSThread()
+}
+
+/*
+var byteStore sync.Pool = sync.Pool{
+  New: func () interface{} { return []byte(nil) },
+}
+
+func util_getBytes() []byte {
+  return byteStore.Get().([]byte)[:0]
+}
+
+func util_putBytes(bs []byte) {
+  byteStore.Put(bs) // FIXME? The cast to interface{} allocates...
+}
+*/
+
+var byteStore chan []byte
+
+func util_initByteStore() {
+  if byteStore == nil {
+    byteStore = make(chan []byte, 32)
+  }
+}
+
+func util_getBytes() []byte {
+  select {
+    case bs := <-byteStore: return bs[:0]
+    default: return nil
+  }
+}
+
+func util_putBytes(bs []byte) {
+  select {
+    case byteStore<-bs:
+    default:
+  }
+}
+