finalizer_test.go

     1  // Copyright 2012 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package race_test
     6  
     7  import (
     8  	"runtime"
     9  	"sync"
    10  	"testing"
    11  	"time"
    12  )
    13  
    14  func TestNoRaceFin(t *testing.T) {
    15  	c := make(chan bool)
    16  	go func() {
    17  		x := new(string)
    18  		runtime.SetFinalizer(x, func(x *string) {
    19  			*x = "foo"
    20  		})
    21  		*x = "bar"
    22  		c <- true
    23  	}()
    24  	<-c
    25  	runtime.GC()
    26  	time.Sleep(100 * time.Millisecond)
    27  }
    28  
    29  var finVar struct {
    30  	sync.Mutex
    31  	cnt int
    32  }
    33  
    34  func TestNoRaceFinGlobal(t *testing.T) {
    35  	c := make(chan bool)
    36  	go func() {
    37  		x := new(string)
    38  		runtime.SetFinalizer(x, func(x *string) {
    39  			finVar.Lock()
    40  			finVar.cnt++
    41  			finVar.Unlock()
    42  		})
    43  		c <- true
    44  	}()
    45  	<-c
    46  	runtime.GC()
    47  	time.Sleep(100 * time.Millisecond)
    48  	finVar.Lock()
    49  	finVar.cnt++
    50  	finVar.Unlock()
    51  }
    52  
    53  func TestRaceFin(t *testing.T) {
    54  	c := make(chan bool)
    55  	y := 0
    56  	_ = y
    57  	go func() {
    58  		x := new(string)
    59  		runtime.SetFinalizer(x, func(x *string) {
    60  			y = 42
    61  		})
    62  		c <- true
    63  	}()
    64  	<-c
    65  	runtime.GC()
    66  	time.Sleep(100 * time.Millisecond)
    67  	y = 66
    68  }
    69
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