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// run
// Copyright 2019 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 the runtime can scan args of an unstarted goroutine
// which starts with a reflect-generated function.
package main
import (
"reflect"
"runtime"
)
const N = 100
func main() {
runtime.GOMAXPROCS(1)
// Run GC in a loop. This makes it more likely GC will catch
// an unstarted goroutine then if we were to GC after kicking
// everything off.
go func() {
for {
runtime.GC()
}
}()
c := make(chan bool, N)
for i := 0; i < N; i++ {
// Test both with an argument and without because this
// affects whether the compiler needs to generate a
// wrapper closure for the "go" statement.
f := reflect.MakeFunc(reflect.TypeOf(((func(*int))(nil))),
func(args []reflect.Value) []reflect.Value {
c <- true
return nil
}).Interface().(func(*int))
go f(nil)
g := reflect.MakeFunc(reflect.TypeOf(((func())(nil))),
func(args []reflect.Value) []reflect.Value {
c <- true
return nil
}).Interface().(func())
go g()
}
for i := 0; i < N*2; i++ {
<-c
}
}
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