blob: 5c212b635643e467cc37654c4329afb5de456530 [file] [log] [blame]
// Copyright 2015 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.
//go:build ignore
// +build ignore
// This build tag means that "go build" does not build this file. Use "go run
// manual_test_program.go" to run it.
// You will also need to change "debug = false" to "debug = true" in mmap_*.go.
package main
import (
var garbage []byte
func main() {
// If you replace "manual_test_program.go" with the name of an empty (zero
// sized) file (and set "const debug = true") then you will not necessarily
// see two "munmap log messages", since some operating systems will not
// allow a zero sized mapping so there is no need for a finalizer to unmap.
const filename = "manual_test_program.go"
for _, explicitClose := range []bool{false, true} {
r, err := mmap.Open(filename)
if err != nil {
log.Fatalf("Open: %v", err)
println("Open succeeded; Len =", r.Len())
if explicitClose {
} else {
// Leak the *mmap.ReaderAt returned by mmap.Open. The finalizer
// should pick it up, if finalizers run at all.
println("Finished all explicit Close calls.")
println("Creating and collecting garbage.")
println("Look for two munmap log messages.")
println("Hit Ctrl-C to exit.")
rng := rand.New(rand.NewSource(1))
now := time.Now()
for {
garbage = make([]byte, rng.Intn(1<<20))
if time.Since(now) > 1*time.Second {
now = time.Now()