handle_test.go

Documentation: runtime/cgo

     1  // Copyright 2021 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 cgo
     6  
     7  import (
     8  	"reflect"
     9  	"testing"
    10  )
    11  
    12  func TestHandle(t *testing.T) {
    13  	v := 42
    14  
    15  	tests := []struct {
    16  		v1 interface{}
    17  		v2 interface{}
    18  	}{
    19  		{v1: v, v2: v},
    20  		{v1: &v, v2: &v},
    21  		{v1: nil, v2: nil},
    22  	}
    23  
    24  	for _, tt := range tests {
    25  		h1 := NewHandle(tt.v1)
    26  		h2 := NewHandle(tt.v2)
    27  
    28  		if uintptr(h1) == 0 || uintptr(h2) == 0 {
    29  			t.Fatalf("NewHandle returns zero")
    30  		}
    31  
    32  		if uintptr(h1) == uintptr(h2) {
    33  			t.Fatalf("Duplicated Go values should have different handles, but got equal")
    34  		}
    35  
    36  		h1v := h1.Value()
    37  		h2v := h2.Value()
    38  		if !reflect.DeepEqual(h1v, h2v) || !reflect.DeepEqual(h1v, tt.v1) {
    39  			t.Fatalf("Value of a Handle got wrong, got %+v %+v, want %+v", h1v, h2v, tt.v1)
    40  		}
    41  
    42  		h1.Delete()
    43  		h2.Delete()
    44  	}
    45  
    46  	siz := 0
    47  	handles.Range(func(k, v interface{}) bool {
    48  		siz++
    49  		return true
    50  	})
    51  	if siz != 0 {
    52  		t.Fatalf("handles are not cleared, got %d, want %d", siz, 0)
    53  	}
    54  }
    55  
    56  func TestInvalidHandle(t *testing.T) {
    57  	t.Run("zero", func(t *testing.T) {
    58  		h := Handle(0)
    59  
    60  		defer func() {
    61  			if r := recover(); r != nil {
    62  				return
    63  			}
    64  			t.Fatalf("Delete of zero handle did not trigger a panic")
    65  		}()
    66  
    67  		h.Delete()
    68  	})
    69  
    70  	t.Run("invalid", func(t *testing.T) {
    71  		h := NewHandle(42)
    72  
    73  		defer func() {
    74  			if r := recover(); r != nil {
    75  				h.Delete()
    76  				return
    77  			}
    78  			t.Fatalf("Invalid handle did not trigger a panic")
    79  		}()
    80  
    81  		Handle(h + 1).Delete()
    82  	})
    83  }
    84  
    85  func BenchmarkHandle(b *testing.B) {
    86  	b.Run("non-concurrent", func(b *testing.B) {
    87  		for i := 0; i < b.N; i++ {
    88  			h := NewHandle(i)
    89  			_ = h.Value()
    90  			h.Delete()
    91  		}
    92  	})
    93  	b.Run("concurrent", func(b *testing.B) {
    94  		b.RunParallel(func(pb *testing.PB) {
    95  			var v int
    96  			for pb.Next() {
    97  				h := NewHandle(v)
    98  				_ = h.Value()
    99  				h.Delete()
   100  			}
   101  		})
   102  	})
   103  }
   104
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