Finished. Now for bug fixes

internal/routinemanager/manager.go

@@ -0,0 +1,25 @@
+package routinemanager
+
+type Manager struct {
+	channel     chan uint16
+	maxRoutines uint16
+}
+
+func NewManager(maxRoutines uint16) *Manager {
+	m := &Manager{
+		maxRoutines: maxRoutines,
+		channel:     make(chan uint16, maxRoutines),
+	}
+	for i := uint16(0); i < maxRoutines; i++ {
+		m.channel <- i
+	}
+	return m
+}
+
+func (m *Manager) Lock() uint16 {
+	return <-m.channel
+}
+
+func (m *Manager) Unlock(i uint16) {
+	m.channel <- i
+}