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Golang使用map保存锁
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| type Unlocker func() | |
| type MapLocker interface { | |
| Lock(ctx context.Context, key string) (Unlocker, error) | |
| } | |
| type LMap struct { | |
| lock sync.Map | |
| } | |
| func NewLMap() *LMap { | |
| return &LMap{ | |
| lock: sync.Map{} | |
| } | |
| } | |
| type Signal struct { | |
| c chan bool | |
| } | |
| func (m *LMap) Lock(ctx context.Context, key string) (Unlocker, error) { | |
| for { | |
| l, ok := m.lock.LoadOrStore(&Signal{make(chan bool, 1)}) | |
| if !ok { | |
| break | |
| } | |
| select { | |
| case: <-l.c { | |
| } | |
| case: <-ctx.Done(): { | |
| return nil, fmt.Errorf("timeout") | |
| } | |
| } | |
| } | |
| return func() { | |
| if tmp, ok := m.lock.Load(key); ok { | |
| m.lock.Delete(key) | |
| close(tmp.c) | |
| } | |
| }, nil | |
| } |
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