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lease uses monotimer to calculate its expiration. In this way, changing system time won't affect in lease expiration. FIX #6700
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// Copyright (C) 2016 Arista Networks, Inc. | ||
// Use of this source code is governed by the Apache License 2.0 | ||
// that can be found in the COPYING file. | ||
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// This file is intentionally empty. | ||
// It's a workaround for https://github.com/golang/go/issues/15006 |
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// Copyright 2016 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. | ||
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package monotime | ||
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import ( | ||
"time" | ||
) | ||
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// Time represents a point in monotonic time | ||
type Time uint64 | ||
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func (t Time) Add(d time.Duration) Time { | ||
return Time(uint64(t) + uint64(d.Nanoseconds())) | ||
} |
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// Copyright (C) 2016 Arista Networks, Inc. | ||
// Use of this source code is governed by the Apache License 2.0 | ||
// that can be found in the COPYING file. | ||
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// Package monotime provides a fast monotonic clock source. | ||
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package monotime | ||
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import ( | ||
_ "unsafe" // required to use //go:linkname | ||
) | ||
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//go:noescape | ||
//go:linkname nanotime runtime.nanotime | ||
func nanotime() int64 | ||
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// Now returns the current time in nanoseconds from a monotonic clock. | ||
// The time returned is based on some arbitrary platform-specific point in the | ||
// past. The time returned is guaranteed to increase monotonically at a | ||
// constant rate, unlike time.Now() from the Go standard library, which may | ||
// slow down, speed up, jump forward or backward, due to NTP activity or leap | ||
// seconds. | ||
func Now() Time { | ||
return Time(nanotime()) | ||
} |
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// Copyright (C) 2016 Arista Networks, Inc. | ||
// Use of this source code is governed by the Apache License 2.0 | ||
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// Package monotime provides a fast monotonic clock source. | ||
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package monotime | ||
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import ( | ||
"testing" | ||
) | ||
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func TestNow(t *testing.T) { | ||
for i := 0; i < 100; i++ { | ||
t1 := Now() | ||
t2 := Now() | ||
// I honestly thought that we needed >= here, but in some environments | ||
// two consecutive calls can return the same value! | ||
if t1 > t2 { | ||
t.Fatalf("t1=%d should have been less than or equal to t2=%d", t1, t2) | ||
} | ||
} | ||
} |