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// 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() || runtime.GOARCH == "wasm" {
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()
}