64 lines
1006 B
Go
64 lines
1006 B
Go
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/* SPDX-License-Identifier: GPL-2.0
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*
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* Copyright (C) 2017-2018 Jason A. Donenfeld <[email protected]>. All Rights Reserved.
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* Copyright (C) 2017-2018 Mathias N. Hall-Andersen <[email protected]>.
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*/
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package main
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import (
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"sync/atomic"
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)
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/* Atomic Boolean */
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const (
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AtomicFalse = int32(iota)
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AtomicTrue
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)
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type AtomicBool struct {
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flag int32
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}
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func (a *AtomicBool) Get() bool {
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return atomic.LoadInt32(&a.flag) == AtomicTrue
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}
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func (a *AtomicBool) Swap(val bool) bool {
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flag := AtomicFalse
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if val {
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flag = AtomicTrue
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}
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return atomic.SwapInt32(&a.flag, flag) == AtomicTrue
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}
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func (a *AtomicBool) Set(val bool) {
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flag := AtomicFalse
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if val {
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flag = AtomicTrue
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}
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atomic.StoreInt32(&a.flag, flag)
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}
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/* Integer manipulation */
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func toInt32(n uint32) int32 {
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mask := uint32(1 << 31)
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return int32(-(n & mask) + (n & ^mask))
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}
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func min(a, b uint) uint {
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if a > b {
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return b
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}
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return a
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}
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func minUint64(a uint64, b uint64) uint64 {
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if a > b {
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return b
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}
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return a
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}
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