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53fd522c0d
Follows suit with https://go-review.googlesource.com/#/c/20111. Generated by running $ grep -R 'Go Authors. All' * | cut -d":" -f1 | while read F;do perl -pi -e 's/Go Authors. All/Go Authors. All/g' $F;done The code in cmd/internal/unvendor wasn't changed. Fixes #15213 Change-Id: I4f235cee0a62ec435f9e8540a1ec08ae03b1a75f Reviewed-on: https://go-review.googlesource.com/21819 Reviewed-by: Ian Lance Taylor <iant@golang.org> Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
92 lines
1.7 KiB
Go
92 lines
1.7 KiB
Go
// run
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// Copyright 2014 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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// Scenario that used to leak arbitrarily many SudoG structs.
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// See golang.org/issue/9110.
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package main
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import (
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"runtime"
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"runtime/debug"
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"sync"
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"time"
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)
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func main() {
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runtime.GOMAXPROCS(1)
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debug.SetGCPercent(1000000) // only GC when we ask for GC
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var stats, stats1, stats2 runtime.MemStats
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release := func() {}
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for i := 0; i < 20; i++ {
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if i == 10 {
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// Should be warmed up by now.
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runtime.ReadMemStats(&stats1)
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}
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c := make(chan int)
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for i := 0; i < 10; i++ {
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go func() {
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select {
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case <-c:
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case <-c:
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case <-c:
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}
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}()
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}
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time.Sleep(1 * time.Millisecond)
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release()
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close(c) // let select put its sudog's into the cache
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time.Sleep(1 * time.Millisecond)
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// pick up top sudog
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var cond1 sync.Cond
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var mu1 sync.Mutex
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cond1.L = &mu1
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go func() {
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mu1.Lock()
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cond1.Wait()
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mu1.Unlock()
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}()
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time.Sleep(1 * time.Millisecond)
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// pick up next sudog
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var cond2 sync.Cond
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var mu2 sync.Mutex
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cond2.L = &mu2
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go func() {
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mu2.Lock()
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cond2.Wait()
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mu2.Unlock()
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}()
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time.Sleep(1 * time.Millisecond)
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// put top sudog back
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cond1.Broadcast()
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time.Sleep(1 * time.Millisecond)
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// drop cache on floor
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runtime.GC()
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// release cond2 after select has gotten to run
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release = func() {
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cond2.Broadcast()
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time.Sleep(1 * time.Millisecond)
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}
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}
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runtime.GC()
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runtime.ReadMemStats(&stats2)
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if int(stats2.HeapObjects)-int(stats1.HeapObjects) > 20 { // normally at most 1 or 2; was 300 with leak
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print("BUG: object leak: ", stats.HeapObjects, " -> ", stats1.HeapObjects, " -> ", stats2.HeapObjects, "\n")
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}
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}
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