mirror of
https://github.com/golang/go
synced 2024-11-02 13:42:29 +00:00
63 lines
1.2 KiB
Go
63 lines
1.2 KiB
Go
|
// run
|
||
|
|
|
||
|
|
// Copyright 2018 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.
|
||
|
|
|
||
|
|
// Make sure return values are always scanned, when
|
||
|
|
// calling methods (+functions, TODO) with reflect.
|
||
|
|
|
||
|
|
package main
|
||
|
|
|
||
|
|
import (
|
||
|
|
"reflect"
|
||
|
|
"runtime/debug"
|
||
|
|
"sync"
|
||
|
|
)
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
debug.SetGCPercent(1) // run GC frequently
|
||
|
|
var wg sync.WaitGroup
|
||
|
|
for i := 0; i < 20; i++ {
|
||
|
|
wg.Add(1)
|
||
|
|
go func() {
|
||
|
|
defer wg.Done()
|
||
|
|
for i := 0; i < 2000; i++ {
|
||
|
|
_test()
|
||
|
|
}
|
||
|
|
}()
|
||
|
|
}
|
||
|
|
wg.Wait()
|
||
|
|
}
|
||
|
|
|
||
|
|
type Stt struct {
|
||
|
|
Data interface{}
|
||
|
|
}
|
||
|
|
|
||
|
|
type My struct {
|
||
|
|
b byte
|
||
|
|
}
|
||
|
|
|
||
|
|
func (this *My) Run(rawData []byte) (Stt, error) {
|
||
|
|
var data string = "hello"
|
||
|
|
stt := Stt{
|
||
|
|
Data: data,
|
||
|
|
}
|
||
|
|
return stt, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func _test() (interface{}, error) {
|
||
|
|
f := reflect.ValueOf(&My{}).MethodByName("Run")
|
||
|
|
if method, ok := f.Interface().(func([]byte) (Stt, error)); ok {
|
||
|
|
s, e := method(nil)
|
||
|
|
// The bug in issue27695 happens here, during the return
|
||
|
|
// from the above call (at the end of reflect.callMethod
|
||
|
|
// when preparing to return). The result value that
|
||
|
|
// is assigned to s was not being scanned if GC happens
|
||
|
|
// to occur there.
|
||
|
|
i := interface{}(s)
|
||
|
|
return i, e
|
||
|
|
}
|
||
|
|
return nil, nil
|
||
|
|
}
|