63 lines
926 B
Go
63 lines
926 B
Go
/* SPDX-License-Identifier: GPL-2.0
|
|
*
|
|
* Copyright (C) 2017-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
|
|
*/
|
|
|
|
package main
|
|
|
|
import (
|
|
"sync/atomic"
|
|
)
|
|
|
|
/* Atomic Boolean */
|
|
|
|
const (
|
|
AtomicFalse = int32(iota)
|
|
AtomicTrue
|
|
)
|
|
|
|
type AtomicBool struct {
|
|
flag int32
|
|
}
|
|
|
|
func (a *AtomicBool) Get() bool {
|
|
return atomic.LoadInt32(&a.flag) == AtomicTrue
|
|
}
|
|
|
|
func (a *AtomicBool) Swap(val bool) bool {
|
|
flag := AtomicFalse
|
|
if val {
|
|
flag = AtomicTrue
|
|
}
|
|
return atomic.SwapInt32(&a.flag, flag) == AtomicTrue
|
|
}
|
|
|
|
func (a *AtomicBool) Set(val bool) {
|
|
flag := AtomicFalse
|
|
if val {
|
|
flag = AtomicTrue
|
|
}
|
|
atomic.StoreInt32(&a.flag, flag)
|
|
}
|
|
|
|
/* Integer manipulation */
|
|
|
|
func toInt32(n uint32) int32 {
|
|
mask := uint32(1 << 31)
|
|
return int32(-(n & mask) + (n & ^mask))
|
|
}
|
|
|
|
func min(a, b uint) uint {
|
|
if a > b {
|
|
return b
|
|
}
|
|
return a
|
|
}
|
|
|
|
func minUint64(a uint64, b uint64) uint64 {
|
|
if a > b {
|
|
return b
|
|
}
|
|
return a
|
|
}
|