128 lines
3.4 KiB
Go
128 lines
3.4 KiB
Go
// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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// Package mclock is a wrapper for a monotonic clock source
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package mclock
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import (
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"time"
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_ "unsafe" // for go:linkname
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)
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//go:noescape
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//go:linkname nanotime runtime.nanotime
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func nanotime() int64
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// AbsTime represents absolute monotonic time.
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type AbsTime int64
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// Now returns the current absolute monotonic time.
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func Now() AbsTime {
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return AbsTime(nanotime())
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}
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// Add returns t + d as absolute time.
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func (t AbsTime) Add(d time.Duration) AbsTime {
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return t + AbsTime(d)
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}
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// Sub returns t - t2 as a duration.
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func (t AbsTime) Sub(t2 AbsTime) time.Duration {
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return time.Duration(t - t2)
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}
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// The Clock interface makes it possible to replace the monotonic system clock with
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// a simulated clock.
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type Clock interface {
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Now() AbsTime
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Sleep(time.Duration)
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NewTimer(time.Duration) ChanTimer
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After(time.Duration) <-chan AbsTime
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AfterFunc(d time.Duration, f func()) Timer
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}
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// Timer is a cancellable event created by AfterFunc.
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type Timer interface {
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// Stop cancels the timer. It returns false if the timer has already
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// expired or been stopped.
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Stop() bool
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}
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// ChanTimer is a cancellable event created by NewTimer.
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type ChanTimer interface {
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Timer
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// The channel returned by C receives a value when the timer expires.
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C() <-chan AbsTime
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// Reset reschedules the timer with a new timeout.
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// It should be invoked only on stopped or expired timers with drained channels.
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Reset(time.Duration)
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}
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// System implements Clock using the system clock.
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type System struct{}
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// Now returns the current monotonic time.
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func (c System) Now() AbsTime {
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return Now()
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}
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// Sleep blocks for the given duration.
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func (c System) Sleep(d time.Duration) {
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time.Sleep(d)
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}
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// NewTimer creates a timer which can be rescheduled.
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func (c System) NewTimer(d time.Duration) ChanTimer {
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ch := make(chan AbsTime, 1)
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t := time.AfterFunc(d, func() {
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// This send is non-blocking because that's how time.Timer
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// behaves. It doesn't matter in the happy case, but does
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// when Reset is misused.
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select {
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case ch <- c.Now():
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default:
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}
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})
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return &systemTimer{t, ch}
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}
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// After returns a channel which receives the current time after d has elapsed.
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func (c System) After(d time.Duration) <-chan AbsTime {
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ch := make(chan AbsTime, 1)
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time.AfterFunc(d, func() { ch <- c.Now() })
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return ch
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}
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// AfterFunc runs f on a new goroutine after the duration has elapsed.
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func (c System) AfterFunc(d time.Duration, f func()) Timer {
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return time.AfterFunc(d, f)
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}
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type systemTimer struct {
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*time.Timer
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ch <-chan AbsTime
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}
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func (st *systemTimer) Reset(d time.Duration) {
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st.Timer.Reset(d)
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}
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func (st *systemTimer) C() <-chan AbsTime {
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return st.ch
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}
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