1 files changed, 51 insertions, 0 deletions
diff --git a/doc/progs/server.go b/doc/progs/server.go
new file mode 100644
index 000000000..b498b53a6
--- /dev/null
+++ b/doc/progs/server.go
@@ -0,0 +1,51 @@
+// 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.
+
+package main
+
+import "fmt"
+
+type request struct {
+	a, b   int
+	replyc chan int
+}
+
+type binOp func(a, b int) int
+
+func run(op binOp, req *request) {
+	reply := op(req.a, req.b)
+	req.replyc <- reply
+}
+
+func server(op binOp, service chan *request) {
+	for {
+		req := <-service
+		go run(op, req) // don't wait for it
+	}
+}
+
+func startServer(op binOp) chan *request {
+	req := make(chan *request)
+	go server(op, req)
+	return req
+}
+
+func main() {
+	adder := startServer(func(a, b int) int { return a + b })
+	const N = 100
+	var reqs [N]request
+	for i := 0; i < N; i++ {
+		req := &reqs[i]
+		req.a = i
+		req.b = i + N
+		req.replyc = make(chan int)
+		adder <- req
+	}
+	for i := N - 1; i >= 0; i-- { // doesn't matter what order
+		if <-reqs[i].replyc != N+2*i {
+			fmt.Println("fail at", i)
+		}
+	}
+	fmt.Println("done")
+}