rclone/lib/pacer/tokens.go

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// 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
}
// Put returns a token
func (td *TokenDispenser) Put() {
td.tokens <- struct{}{}
}