mirror of
https://github.com/autc04/Retro68.git
synced 2024-09-08 20:55:01 +00:00
84 lines
1.4 KiB
Go
84 lines
1.4 KiB
Go
|
// 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.
|
||
|
|
||
|
package runtime_test
|
||
|
|
||
|
import (
|
||
|
"runtime"
|
||
|
"sync"
|
||
|
"testing"
|
||
|
)
|
||
|
|
||
|
type response struct {
|
||
|
}
|
||
|
|
||
|
type myError struct {
|
||
|
}
|
||
|
|
||
|
func (myError) Error() string { return "" }
|
||
|
|
||
|
func doRequest(useSelect bool) (*response, error) {
|
||
|
type async struct {
|
||
|
resp *response
|
||
|
err error
|
||
|
}
|
||
|
ch := make(chan *async, 0)
|
||
|
done := make(chan struct{}, 0)
|
||
|
|
||
|
if useSelect {
|
||
|
go func() {
|
||
|
select {
|
||
|
case ch <- &async{resp: nil, err: myError{}}:
|
||
|
case <-done:
|
||
|
}
|
||
|
}()
|
||
|
} else {
|
||
|
go func() {
|
||
|
ch <- &async{resp: nil, err: myError{}}
|
||
|
}()
|
||
|
}
|
||
|
|
||
|
r := <-ch
|
||
|
runtime.Gosched()
|
||
|
return r.resp, r.err
|
||
|
}
|
||
|
|
||
|
func TestChanSendSelectBarrier(t *testing.T) {
|
||
|
testChanSendBarrier(true)
|
||
|
}
|
||
|
|
||
|
func TestChanSendBarrier(t *testing.T) {
|
||
|
testChanSendBarrier(false)
|
||
|
}
|
||
|
|
||
|
func testChanSendBarrier(useSelect bool) {
|
||
|
var wg sync.WaitGroup
|
||
|
var globalMu sync.Mutex
|
||
|
outer := 100
|
||
|
inner := 100000
|
||
|
if testing.Short() {
|
||
|
outer = 10
|
||
|
inner = 1000
|
||
|
}
|
||
|
for i := 0; i < outer; i++ {
|
||
|
wg.Add(1)
|
||
|
go func() {
|
||
|
defer wg.Done()
|
||
|
var garbage []byte
|
||
|
for j := 0; j < inner; j++ {
|
||
|
_, err := doRequest(useSelect)
|
||
|
_, ok := err.(myError)
|
||
|
if !ok {
|
||
|
panic(1)
|
||
|
}
|
||
|
garbage = make([]byte, 1<<10)
|
||
|
}
|
||
|
globalMu.Lock()
|
||
|
global = garbage
|
||
|
globalMu.Unlock()
|
||
|
}()
|
||
|
}
|
||
|
wg.Wait()
|
||
|
}
|