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// $G $D/$F.go && $L $F.$A && ./$A.out

// Copyright 2009 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.

// trivial finalizer test

package main

import (
        "runtime"
        "time"
)

const N = 250

type A struct {
        b *B
        n int
}

type B struct {
        n int
}

var i int
var nfinal int
var final [N]int

// the unused return is to test finalizers with return values
func finalA(a *A) (unused [N]int) {
        if final[a.n] != 0 {
                println("finalA", a.n, final[a.n])
                panic("fail")
        }
        final[a.n] = 1
        return
}

func finalB(b *B) {
        if final[b.n] != 1 {
                println("finalB", b.n, final[b.n])
                panic("fail")
        }
        final[b.n] = 2
        nfinal++
}

func nofinalB(b *B) {
        panic("nofinalB run")
}

func main() {
        runtime.GOMAXPROCS(4)
        for i = 0; i < N; i++ {
                b := &B{i}
                a := &A{b, i}
                c := new(B)
                runtime.SetFinalizer(c, nofinalB)
                runtime.SetFinalizer(b, finalB)
                runtime.SetFinalizer(a, finalA)
                runtime.SetFinalizer(c, nil)
        }
        for i := 0; i < N; i++ {
                runtime.GC()
                runtime.Gosched()
                time.Sleep(1e6)
                if nfinal >= N*8/10 {
                        break
                }
        }
        if nfinal < N*8/10 {
                println("not enough finalizing:", nfinal, "/", N)
                panic("fail")
        }
}