runtime: run goroutines during init

Fixes issue 583.
Fixes issue 1776.
Fixes issue 2001.
Fixes issue 2112.

R=golang-dev, bradfitz, r, gri
CC=golang-dev
http://codereview.appspot.com/5265044

1 files changed, 44 insertions, 0 deletions

diff --git a/test/init1.go b/test/init1.go
new file mode 100644
index 000000000..9ce3c12ee
--- /dev/null
+++ b/test/init1.go
@@ -0,0 +1,44 @@
+// $G $D/$F.go && $L $F.$A && ./$A.out
+
+// Copyright 2011 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.
+
+// Test that goroutines and garbage collection run during init.
+
+package main
+
+import "runtime"
+
+var x []byte
+
+func init() {
+	c := make(chan int)
+	go send(c)
+	<-c
+	
+	const chunk = 1<<20
+	runtime.UpdateMemStats()
+	sys := runtime.MemStats.Sys	
+	b := make([]byte, chunk)
+	for i := range b {
+		b[i] = byte(i%10 + '0')
+	}
+	s := string(b)
+	for i := 0; i < 1000; i++ {
+		x = []byte(s)
+	}
+	runtime.UpdateMemStats()
+	sys1 := runtime.MemStats.Sys
+	if sys1-sys > chunk*50 {
+		println("allocated 1000 chunks of", chunk, "and used ", sys1-sys, "memory")
+	}
+}
+
+func send(c chan int) {
+	c <- 1
+}
+
+func main() {
+}
+