VENDOR intensifies

vendor/github.com/ncw/rclone/lib/pacer/tokens.go

@@ -0,0 +1,31 @@
+// Tokens for controlling concurrency
+
+package pacer
+
+// TokenDispenser is for controlling concurrency
+type TokenDispenser struct {
+	tokens chan struct{}
+}
+
+// NewTokenDispenser makes a pool of n tokens
+func NewTokenDispenser(n int) *TokenDispenser {
+	td := &TokenDispenser{
+		tokens: make(chan struct{}, n),
+	}
+	// Fill up the upload tokens
+	for i := 0; i < n; i++ {
+		td.tokens <- struct{}{}
+	}
+	return td
+}
+
+// Get gets a token from the pool - don't forget to return it with Put
+func (td *TokenDispenser) Get() {
+	<-td.tokens
+	return
+}
+
+// Put returns a token
+func (td *TokenDispenser) Put() {
+	td.tokens <- struct{}{}
+}