mirror of
https://github.com/golang/go
synced 2024-11-23 14:20:05 -07:00
644493f109
While we’re here, clean up a few comments. Fixes #15281 Change-Id: Ia6173e9941133db08f57bc80bdd3c5722122bfdb Reviewed-on: https://go-review.googlesource.com/22082 Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: David Chase <drchase@google.com>
65 lines
1.2 KiB
Go
65 lines
1.2 KiB
Go
// run
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// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import "runtime"
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func main() {
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{
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x := inuse()
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c := make(chan []byte, 10)
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c <- make([]byte, 10<<20)
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close(c)
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f1(c, x)
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}
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{
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x := inuse()
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c := make(chan []byte, 10)
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c <- make([]byte, 10<<20)
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close(c)
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f2(c, x)
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}
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}
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func f1(c chan []byte, start int64) {
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for x := range c {
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if delta := inuse() - start; delta < 9<<20 {
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println("BUG: f1: after alloc: expected delta at least 9MB, got: ", delta)
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println(x)
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}
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x = nil
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if delta := inuse() - start; delta > 1<<20 {
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println("BUG: f1: after alloc: expected delta below 1MB, got: ", delta)
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println(x)
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}
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}
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}
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func f2(c chan []byte, start int64) {
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for {
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x, ok := <-c
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if !ok {
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break
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}
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if delta := inuse() - start; delta < 9<<20 {
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println("BUG: f2: after alloc: expected delta at least 9MB, got: ", delta)
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println(x)
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}
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x = nil
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if delta := inuse() - start; delta > 1<<20 {
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println("BUG: f2: after alloc: expected delta below 1MB, got: ", delta)
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println(x)
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}
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}
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}
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func inuse() int64 {
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runtime.GC()
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var st runtime.MemStats
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runtime.ReadMemStats(&st)
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return int64(st.Alloc)
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}
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