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// run // 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. // Test close(c), receive of closed channel. // // TODO(rsc): Doesn't check behavior of close(c) when there // are blocked senders/receivers. package main import "os" var failed bool type Chan interface { Send(int) Nbsend(int) bool Recv() (int) Nbrecv() (int, bool) Recv2() (int, bool) Nbrecv2() (int, bool, bool) Close() Impl() string } // direct channel operations when possible type XChan chan int func (c XChan) Send(x int) { c <- x } func (c XChan) Nbsend(x int) bool { select { case c <- x: return true default: return false } panic("nbsend") } func (c XChan) Recv() int { return <-c } func (c XChan) Nbrecv() (int, bool) { select { case x := <-c: return x, true default: return 0, false } panic("nbrecv") } func (c XChan) Recv2() (int, bool) { x, ok := <-c return x, ok } func (c XChan) Nbrecv2() (int, bool, bool) { select { case x, ok := <-c: return x, ok, true default: return 0, false, false } panic("nbrecv2") } func (c XChan) Close() { close(c) } func (c XChan) Impl() string { return "(<- operator)" } // indirect operations via select type SChan chan int func (c SChan) Send(x int) { select { case c <- x: } } func (c SChan) Nbsend(x int) bool { select { default: return false case c <- x: return true } panic("nbsend") } func (c SChan) Recv() int { select { case x := <-c: return x } panic("recv") } func (c SChan) Nbrecv() (int, bool) { select { default: return 0, false case x := <-c: return x, true } panic("nbrecv") } func (c SChan) Recv2() (int, bool) { select { case x, ok := <-c: return x, ok } panic("recv") } func (c SChan) Nbrecv2() (int, bool, bool) { select { default: return 0, false, false case x, ok := <-c: return x, ok, true } panic("nbrecv") } func (c SChan) Close() { close(c) } func (c SChan) Impl() string { return "(select)" } // indirect operations via larger selects var dummy = make(chan bool) type SSChan chan int func (c SSChan) Send(x int) { select { case c <- x: case <-dummy: } } func (c SSChan) Nbsend(x int) bool { select { default: return false case <-dummy: case c <- x: return true } panic("nbsend") } func (c SSChan) Recv() int { select { case <-dummy: case x := <-c: return x } panic("recv") } func (c SSChan) Nbrecv() (int, bool) { select { case <-dummy: default: return 0, false case x := <-c: return x, true } panic("nbrecv") } func (c SSChan) Recv2() (int, bool) { select { case <-dummy: case x, ok := <-c: return x, ok } panic("recv") } func (c SSChan) Nbrecv2() (int, bool, bool) { select { case <-dummy: default: return 0, false, false case x, ok := <-c: return x, ok, true } panic("nbrecv") } func (c SSChan) Close() { close(c) } func (c SSChan) Impl() string { return "(select)" } func shouldPanic(f func()) { defer func() { if recover() == nil { panic("did not panic") } }() f() } func test1(c Chan) { for i := 0; i < 3; i++ { // recv a close signal (a zero value) if x := c.Recv(); x != 0 { println("test1: recv on closed:", x, c.Impl()) failed = true } if x, ok := c.Recv2(); x != 0 || ok { println("test1: recv2 on closed:", x, ok, c.Impl()) failed = true } // should work with select: received a value without blocking, so selected == true. x, selected := c.Nbrecv() if x != 0 || !selected { println("test1: recv on closed nb:", x, selected, c.Impl()) failed = true } x, ok, selected := c.Nbrecv2() if x != 0 || ok || !selected { println("test1: recv2 on closed nb:", x, ok, selected, c.Impl()) failed = true } } // send should work with ,ok too: sent a value without blocking, so ok == true. shouldPanic(func() { c.Nbsend(1) }) // the value should have been discarded. if x := c.Recv(); x != 0 { println("test1: recv on closed got non-zero after send on closed:", x, c.Impl()) failed = true } // similarly Send. shouldPanic(func() { c.Send(2) }) if x := c.Recv(); x != 0 { println("test1: recv on closed got non-zero after send on closed:", x, c.Impl()) failed = true } } func testasync1(c Chan) { // should be able to get the last value via Recv if x := c.Recv(); x != 1 { println("testasync1: Recv did not get 1:", x, c.Impl()) failed = true } test1(c) } func testasync2(c Chan) { // should be able to get the last value via Recv2 if x, ok := c.Recv2(); x != 1 || !ok { println("testasync1: Recv did not get 1, true:", x, ok, c.Impl()) failed = true } test1(c) } func testasync3(c Chan) { // should be able to get the last value via Nbrecv if x, selected := c.Nbrecv(); x != 1 || !selected { println("testasync2: Nbrecv did not get 1, true:", x, selected, c.Impl()) failed = true } test1(c) } func testasync4(c Chan) { // should be able to get the last value via Nbrecv2 if x, ok, selected := c.Nbrecv2(); x != 1 || !ok || !selected { println("testasync2: Nbrecv did not get 1, true, true:", x, ok, selected, c.Impl()) failed = true } test1(c) } func closedsync() chan int { c := make(chan int) close(c) return c } func closedasync() chan int { c := make(chan int, 2) c <- 1 close(c) return c } var mks = []func(chan int) Chan { func(c chan int) Chan { return XChan(c) }, func(c chan int) Chan { return SChan(c) }, func(c chan int) Chan { return SSChan(c) }, } var testcloseds = []func(Chan) { testasync1, testasync2, testasync3, testasync4, } func main() { for _, mk := range mks { test1(mk(closedsync())) } for _, testclosed := range testcloseds { for _, mk := range mks { testclosed(mk(closedasync())) } } var ch chan int shouldPanic(func() { close(ch) }) ch = make(chan int) close(ch) shouldPanic(func() { close(ch) }) if failed { os.Exit(1) } }