/
kv.go
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/
kv.go
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/*
* Copyright (C) 2020-2022, IrineSistiana
*
* This file is part of mosdns.
*
* mosdns is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* mosdns is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package query_context
import "sync/atomic"
var kId atomic.Uint32
// RegKey returns a unique uint32 for the key used in
// Context.StoreValue, Context.GetValue.
// It should only be called during initialization.
func RegKey() uint32 {
i := kId.Add(1)
if i == 0 {
panic("key id overflowed")
}
return i
}