//go:build goexperiment.rangefunc

package main

import (
	"fmt"
	"iter"
	"runtime"
)

func init() {
	register("CoroLockOSThreadIterLock", func() {
		println("expect: OK")
		CoroLockOSThread(callerExhaust, iterLock)
	})
	register("CoroLockOSThreadIterLockYield", func() {
		println("expect: OS thread locking must match")
		CoroLockOSThread(callerExhaust, iterLockYield)
	})
	register("CoroLockOSThreadLock", func() {

// has not yet completed. See [Conn.SetDeadline], [Conn.SetReadDeadline], and
// [Conn.SetWriteDeadline].
func (c *Conn) Write(b []byte) (int, error) {
	// interlock with Close below
	for {
		x := c.activeCall.Load()
		if x&1 != 0 {
			return 0, net.ErrClosed
		}
		if c.activeCall.CompareAndSwap(x, x+2) {
			break
		}
	}
	defer c.activeCall.Add(-2)