mirror of
https://github.com/golang/go
synced 2024-09-06 00:19:45 +00:00
![Russ Cox](/assets/img/avatar_default.png)
* adds pass 3 to dequeue from channels eagerly various other cleanup/churn: * use switch on cas->send in each pass to factor out common code. * longer goto labels, commented at target * be more agressive about can't happen: throw instead of print + cope. * use "select" instead of "selectgo" in errors * use printf for debug prints when possible R=ken2, ken3 CC=golang-dev, r https://golang.org/cl/875041
49 lines
888 B
Go
49 lines
888 B
Go
// $G $D/$F.go && $L $F.$A && ./$A.out
|
|
|
|
// Copyright 2010 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 main
|
|
|
|
import "runtime"
|
|
|
|
func sender(c chan int, n int) {
|
|
for i := 0; i < n; i++ {
|
|
c <- 1
|
|
}
|
|
}
|
|
|
|
func receiver(c, dummy chan int, n int) {
|
|
for i := 0; i < n; i++ {
|
|
select {
|
|
case <-c:
|
|
// nothing
|
|
case <-dummy:
|
|
panic("dummy")
|
|
}
|
|
}
|
|
}
|
|
|
|
func main() {
|
|
runtime.MemProfileRate = 0
|
|
|
|
c := make(chan int)
|
|
dummy := make(chan int)
|
|
|
|
// warm up
|
|
go sender(c, 100000)
|
|
receiver(c, dummy, 100000)
|
|
runtime.GC()
|
|
runtime.MemStats.Alloc = 0
|
|
|
|
// second time shouldn't increase footprint by much
|
|
go sender(c, 100000)
|
|
receiver(c, dummy, 100000)
|
|
runtime.GC()
|
|
|
|
if runtime.MemStats.Alloc > 1e5 {
|
|
println("BUG: too much memory for 100,000 selects:", runtime.MemStats.Alloc)
|
|
}
|
|
}
|