// Copyright 2015 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 runtime_test
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import (
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"runtime"
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"sync"
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"testing"
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)
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type response struct {
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}
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type myError struct {
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}
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func (myError) Error() string { return "" }
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func doRequest(useSelect bool) (*response, error) {
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type async struct {
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resp *response
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err error
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}
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ch := make(chan *async, 0)
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done := make(chan struct{}, 0)
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if useSelect {
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go func() {
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select {
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case ch <- &async{resp: nil, err: myError{}}:
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case <-done:
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}
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}()
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} else {
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go func() {
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ch <- &async{resp: nil, err: myError{}}
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}()
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}
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r := <-ch
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runtime.Gosched()
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return r.resp, r.err
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}
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func TestChanSendSelectBarrier(t *testing.T) {
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testChanSendBarrier(true)
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}
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func TestChanSendBarrier(t *testing.T) {
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testChanSendBarrier(false)
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}
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func testChanSendBarrier(useSelect bool) {
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var wg sync.WaitGroup
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var globalMu sync.Mutex
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outer := 100
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inner := 100000
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if testing.Short() || runtime.GOARCH == "wasm" {
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outer = 10
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inner = 1000
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}
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for i := 0; i < outer; i++ {
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wg.Add(1)
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go func() {
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defer wg.Done()
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var garbage []byte
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for j := 0; j < inner; j++ {
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_, err := doRequest(useSelect)
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_, ok := err.(myError)
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if !ok {
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panic(1)
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}
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garbage = make([]byte, 1<<10)
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}
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globalMu.Lock()
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global = garbage
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globalMu.Unlock()
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}()
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}
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wg.Wait()
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}
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