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	: 82.25.127.225 / nivaandassociates.com
	: Linux in-mum-web845.main-hosting.eu 4.18.0-553.40.1.lve.el8.x86_64 #1 SMP Wed Feb 12 18:54:57 UTC 2025 x86_64

: /opt/golang/1.22.0/test/

files >> //opt/golang/1.22.0/test/atomicload.go

 // run

// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Check that we do loads exactly once. The SSA backend
// once tried to do the load in f twice, once sign extended
// and once zero extended.  This can cause problems in
// racy code, particularly sync/mutex.

package main

func f(p *byte) bool {
	x := *p
	a := int64(int8(x))
	b := int64(uint8(x))
	return a == b
}

func main() {
	var x byte
	const N = 1000000
	c := make(chan struct{})
	go func() {
		for i := 0; i < N; i++ {
			x = 1
		}
		c <- struct{}{}
	}()
	go func() {
		for i := 0; i < N; i++ {
			x = 2
		}
		c <- struct{}{}
	}()

	for i := 0; i < N; i++ {
		if !f(&x) {
			panic("non-atomic load!")
		}
	}
	<-c
	<-c
}