bug512.go

     1  // run
     2  
     3  // Copyright 2021 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  // Gccgo did not make a copy of a value receiver when using a
     8  // goroutine to call a method.
     9  
    10  package main
    11  
    12  import (
    13  	"sync"
    14  	"sync/atomic"
    15  )
    16  
    17  var wg sync.WaitGroup
    18  
    19  type S struct {
    20  	i1, i2 int32
    21  }
    22  
    23  var done int32
    24  
    25  func (s S) Check(v1, v2 int32) {
    26  	for {
    27  		if g1 := atomic.LoadInt32(&s.i1); v1 != g1 {
    28  			panic(g1)
    29  		}
    30  		if g2 := atomic.LoadInt32(&s.i2); v2 != g2 {
    31  			panic(g2)
    32  		}
    33  		if atomic.LoadInt32(&done) != 0 {
    34  			break
    35  		}
    36  	}
    37  	wg.Done()
    38  }
    39  
    40  func F() {
    41  	s := S{1, 2}
    42  	go s.Check(1, 2)
    43  	atomic.StoreInt32(&s.i1, 3)
    44  	atomic.StoreInt32(&s.i2, 4)
    45  	atomic.StoreInt32(&done, 1)
    46  }
    47  
    48  func main() {
    49  	wg.Add(1)
    50  	F()
    51  	wg.Wait()
    52  }
    53
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