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// run
// Copyright 2023 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.
package main
import (
"sync"
"time"
)
type B struct {
pid int
f func() (uint64, error)
wg sync.WaitGroup
v uint64
}
func newB(pid int) *B {
return &B{
pid: pid,
}
}
//go:noinline
func Sq(i int) uint64 {
S++
return uint64(i * i)
}
type RO func(*B)
var ROSL = []RO{
Bad(),
}
func Bad() RO {
return func(b *B) {
b.f = func() (uint64, error) {
return Sq(b.pid), nil
}
}
}
func (b *B) startit() chan<- struct{} {
stop := make(chan struct{})
b.wg.Add(1)
go func() {
defer b.wg.Done()
var v uint64
for {
select {
case <-stop:
b.v = v
return
case <-time.After(1 * time.Millisecond):
r, err := b.f()
if err != nil {
panic("bad")
}
v = r
}
}
}()
return stop
}
var S, G int
//go:noinline
func rec(x int) int {
if x == 0 {
return 9
}
return rec(x-1) + 1
}
//go:noinline
func recur(x int) {
for i := 0; i < x; i++ {
G = rec(i)
}
}
func main() {
b := newB(17)
for _, opt := range ROSL {
opt(b)
}
stop := b.startit()
// see if we can get some stack growth/moving
recur(10101)
if stop != nil {
stop <- struct{}{}
}
}