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package queue // import "github.com/docker/docker/libcontainerd/queue"
import "sync"
// Queue is the structure used for holding functions in a queue.
type Queue struct {
sync.Mutex
fns map[string]chan struct{}
}
// Append adds an item to a queue.
func (q *Queue) Append(id string, f func()) {
q.Lock()
defer q.Unlock()
if q.fns == nil {
q.fns = make(map[string]chan struct{})
}
done := make(chan struct{})
fn, ok := q.fns[id]
q.fns[id] = done
go func() {
if ok {
<-fn
}
f()
close(done)
q.Lock()
if q.fns[id] == done {
delete(q.fns, id)
}
q.Unlock()
}()
}
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