41 lines
1.0 KiB
Go
41 lines
1.0 KiB
Go
// Copyright (C) 2014 The Syncthing Authors.
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//
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// This program is free software: you can redistribute it and/or modify it
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// under the terms of the GNU General Public License as published by the Free
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// Software Foundation, either version 3 of the License, or (at your option)
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// any later version.
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//
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// This program is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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// more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this program. If not, see <http://www.gnu.org/licenses/>.
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// Package lamport implements a simple Lamport Clock for versioning
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package lamport
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import "sync"
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var Default = Clock{}
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type Clock struct {
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val uint64
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mut sync.Mutex
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}
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func (c *Clock) Tick(v uint64) uint64 {
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c.mut.Lock()
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if v > c.val {
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c.val = v + 1
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c.mut.Unlock()
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return v + 1
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} else {
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c.val++
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v = c.val
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c.mut.Unlock()
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return v
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}
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}
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