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48 lines
1.4 KiB
48 lines
1.4 KiB
// Go MySQL Driver - A MySQL-Driver for Go's database/sql package.
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//
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// Copyright 2022 The Go-MySQL-Driver Authors. All rights reserved.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// You can obtain one at http://mozilla.org/MPL/2.0/.
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//go:build !go1.19
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// +build !go1.19
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package mysql
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import "sync/atomic"
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/******************************************************************************
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* Sync utils *
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******************************************************************************/
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// atomicBool is an implementation of atomic.Bool for older version of Go.
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// it is a wrapper around uint32 for usage as a boolean value with
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// atomic access.
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type atomicBool struct {
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_ noCopy
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value uint32
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}
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// Load returns whether the current boolean value is true
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func (ab *atomicBool) Load() bool {
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return atomic.LoadUint32(&ab.value) > 0
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}
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// Store sets the value of the bool regardless of the previous value
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func (ab *atomicBool) Store(value bool) {
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if value {
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atomic.StoreUint32(&ab.value, 1)
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} else {
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atomic.StoreUint32(&ab.value, 0)
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}
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}
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// Swap sets the value of the bool and returns the old value.
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func (ab *atomicBool) Swap(value bool) bool {
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if value {
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return atomic.SwapUint32(&ab.value, 1) > 0
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}
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return atomic.SwapUint32(&ab.value, 0) > 0
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}
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