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timer.go
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timer.go
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// Copyright 2022 Northern.tech AS
//
// 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 worker
import "time"
// reusableTimer allows using the time.After interface without reallocations.
type reusableTimer time.Timer
func newStoppedTimer() *reusableTimer {
t := (*reusableTimer)(time.NewTimer(0))
t.Stop()
return t
}
// Stop ensures that the timer is stopped and the channel is cleared.
func (t *reusableTimer) Stop() {
if (*time.Timer)(t).Stop() {
select {
case <-t.C:
default:
}
}
}
func (t *reusableTimer) Reset(d time.Duration) {
t.Stop()
(*time.Timer)(t).Reset(d)
}
func (t *reusableTimer) After(d time.Duration) <-chan time.Time {
t.Reset(d)
return t.C
}