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      1 // run
      2 
      3 // Copyright 2011 The Go Authors. All rights reserved.
      4 // Use of this source code is governed by a BSD-style
      5 // license that can be found in the LICENSE file.
      6 
      7 // Test select when discarding a value.
      8 
      9 package main
     10 
     11 import "runtime"
     12 
     13 func recv1(c <-chan int) {
     14 	<-c
     15 }
     16 
     17 func recv2(c <-chan int) {
     18 	select {
     19 	case <-c:
     20 	}
     21 }
     22 
     23 func recv3(c <-chan int) {
     24 	c2 := make(chan int)
     25 	select {
     26 	case <-c:
     27 	case <-c2:
     28 	}
     29 }
     30 
     31 func send1(recv func(<-chan int)) {
     32 	c := make(chan int)
     33 	go recv(c)
     34 	runtime.Gosched()
     35 	c <- 1
     36 }
     37 
     38 func send2(recv func(<-chan int)) {
     39 	c := make(chan int)
     40 	go recv(c)
     41 	runtime.Gosched()
     42 	select {
     43 	case c <- 1:
     44 	}
     45 }
     46 
     47 func send3(recv func(<-chan int)) {
     48 	c := make(chan int)
     49 	go recv(c)
     50 	runtime.Gosched()
     51 	c2 := make(chan int)
     52 	select {
     53 	case c <- 1:
     54 	case c2 <- 1:
     55 	}
     56 }
     57 
     58 func main() {
     59 	send1(recv1)
     60 	send2(recv1)
     61 	send3(recv1)
     62 	send1(recv2)
     63 	send2(recv2)
     64 	send3(recv2)
     65 	send1(recv3)
     66 	send2(recv3)
     67 	send3(recv3)
     68 }
     69