blob: 297e48a47d76f3866bac6b03563e994492711437 [file] [log] [blame]
// Copyright 2015 The etcd Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package wait
import "sync"
type WaitTime interface {
// Wait returns a chan that waits on the given logical deadline.
// The chan will be triggered when Trigger is called with a
// deadline that is later than the one it is waiting for.
Wait(deadline uint64) <-chan struct{}
// Trigger triggers all the waiting chans with an earlier logical deadline.
Trigger(deadline uint64)
}
var closec chan struct{}
func init() { closec = make(chan struct{}); close(closec) }
type timeList struct {
l sync.Mutex
lastTriggerDeadline uint64
m map[uint64]chan struct{}
}
func NewTimeList() *timeList {
return &timeList{m: make(map[uint64]chan struct{})}
}
func (tl *timeList) Wait(deadline uint64) <-chan struct{} {
tl.l.Lock()
defer tl.l.Unlock()
if tl.lastTriggerDeadline >= deadline {
return closec
}
ch := tl.m[deadline]
if ch == nil {
ch = make(chan struct{})
tl.m[deadline] = ch
}
return ch
}
func (tl *timeList) Trigger(deadline uint64) {
tl.l.Lock()
defer tl.l.Unlock()
tl.lastTriggerDeadline = deadline
for t, ch := range tl.m {
if t <= deadline {
delete(tl.m, t)
close(ch)
}
}
}