add test for non-blocking channel ops

SVN=127595

test/chan/nonblock.go

+// $G $D/$F.go && $L $F.$A && ./$A.out
+
+// Copyright 2009 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.
+
+// Verify channel operations that test for blocking
+// Use several sizes and types of operands
+
+package main
+
+func pause() {
+	for i:=0; i<100; i++ { sys.gosched() }
+}
+
+func i32receiver(c *chan int32) {
+	<-c
+}
+
+func i32sender(c *chan int32) {
+	c -< 1
+}
+
+func i64receiver(c *chan int64) {
+	<-c
+}
+
+func i64sender(c *chan int64) {
+	c -< 1
+}
+
+func breceiver(c *chan bool) {
+	<-c
+}
+
+func bsender(c *chan bool) {
+	c -< true
+}
+
+func sreceiver(c *chan string) {
+	<-c
+}
+
+func ssender(c *chan string) {
+	c -< "hi"
+}
+
+func main() {
+	var i32 int32;
+	var i64 int64;
+	var b bool;
+	var s string;
+	var ok bool;
+
+	c32 := new(chan int32);
+	c64 := new(chan int64);
+	cb := new(chan bool);
+	cs := new(chan string);
+
+	i32, ok = <-c32;
+	if ok { panic "blocked i32sender" }
+
+	i64, ok = <-c64;
+	if ok { panic "blocked i64sender" }
+
+	b, ok = <-cb;
+	if ok { panic "blocked bsender" }
+
+	s, ok = <-cs;
+	if ok { panic "blocked ssender" }
+
+	go i32receiver(c32);
+	pause();
+	ok = c32 -< 1;
+	if !ok { panic "i32receiver" }
+	go i32sender(c32);
+	pause();
+	i32, ok = <-c32;
+	if !ok { panic "i32sender" }
+
+	go i64receiver(c64);
+	pause();
+	ok = c64 -< 1;
+	if !ok { panic "i64receiver" }
+	go i64sender(c64);
+	pause();
+	i64, ok = <-c64;
+	if !ok { panic "i64sender" }
+
+	go breceiver(cb);
+	pause();
+	ok = cb -< true;
+	if !ok { panic "breceiver" }
+	go bsender(cb);
+	pause();
+	b, ok = <-cb;
+	if !ok { panic "bsender" }
+
+	go sreceiver(cs);
+	pause();
+	ok = cs -< "hi";
+	if !ok { panic "sreceiver" }
+	go ssender(cs);
+	pause();
+	s, ok = <-cs;
+	if !ok { panic "ssender" }
+}