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Source file test/fixedbugs/bug320.go

Documentation: test/fixedbugs

  // run
  
  // 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.
  
  package main
  
  func main() {
  	c := make(chan int, 1)
  	dummy := make(chan int)
  	v := 0x12345678
  	for i := 0; i < 10; i++ {
  		// 6g had a bug that caused select to pass &t to
  		// selectrecv before allocating the memory for t,
  		// which caused non-deterministic crashes.
  		// This test looks for the bug by checking that the
  		// value received actually ends up in t.
  		// If the allocation happens after storing through
  		// whatever garbage &t holds, the later reference
  		// to t in the case body will use the new pointer and
  		// not see the received value.
  		v += 0x1020304
  		c <- v
  		select {
  		case t := <-c:
  			go func() {
  				f(t)
  			}()
  			escape(&t)
  			if t != v {
  				println(i, v, t)
  				panic("wrong values")
  			}
  		case dummy <- 1:
  		}
  	}
  }
  
  func escape(*int) {
  }
  
  func f(int) {
  }
  
  

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