| 62 | } |
| 63 | |
| 64 | func (m *lockMap) WaitOrLock(key interface{}, ttl time.Duration) (promise Promise, gotLock bool) { |
| 65 | p := make(chan struct{}) |
| 66 | |
| 67 | now := time.Now() |
| 68 | expiration := now.Add(ttl).UnixNano() |
| 69 | |
| 70 | m.l.Lock() |
| 71 | defer m.l.Unlock() |
| 72 | |
| 73 | if prev, ok := m.promises[key]; ok { |
| 74 | if prev.expiration > now.UnixNano() { |
| 75 | return prev.promise, false |
| 76 | } |
| 77 | |
| 78 | // Current entry is expired |
| 79 | prev.resolve() |
| 80 | } |
| 81 | |
| 82 | m.promises[key] = &entry{ |
| 83 | expiration: expiration, |
| 84 | promise: p, |
| 85 | } |
| 86 | |
| 87 | return p, true |
| 88 | } |
| 89 | |
| 90 | func (m *lockMap) Release(key interface{}) { |
| 91 | m.l.Lock() |