gitee.com/go-spring2/spring-base@v1.1.3/atomic/uintptr_test.go (about)

     1  /*
     2   * Copyright 2012-2019 the original author or authors.
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *      https://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  package atomic_test
    18  
    19  import (
    20  	"testing"
    21  	"unsafe"
    22  
    23  	"gitee.com/go-spring2/spring-base/assert"
    24  	"gitee.com/go-spring2/spring-base/atomic"
    25  )
    26  
    27  func TestUintptr(t *testing.T) {
    28  
    29  	// atomic.Uintptr and uintptr occupy the same space
    30  	assert.Equal(t, unsafe.Sizeof(atomic.Uintptr{}), uintptr(8))
    31  
    32  	var p atomic.Uintptr
    33  	assert.Equal(t, p.Load(), uintptr(0))
    34  
    35  	v := p.Add(0)
    36  	assert.Equal(t, v, uintptr(0))
    37  	assert.Equal(t, p.Load(), uintptr(0))
    38  
    39  	s1 := &properties{Data: 1}
    40  	p.Store(uintptr(unsafe.Pointer(s1)))
    41  	assert.Equal(t, p.Load(), uintptr(unsafe.Pointer(s1)))
    42  
    43  	s2 := &properties{Data: 2}
    44  	old := p.Swap(uintptr(unsafe.Pointer(s2)))
    45  	assert.Equal(t, old, uintptr(unsafe.Pointer(s1)))
    46  	assert.Equal(t, p.Load(), uintptr(unsafe.Pointer(s2)))
    47  
    48  	s3 := &properties{Data: 3}
    49  	swapped := p.CompareAndSwap(uintptr(unsafe.Pointer(s2)), uintptr(unsafe.Pointer(s3)))
    50  	assert.True(t, swapped)
    51  	assert.Equal(t, p.Load(), uintptr(unsafe.Pointer(s3)))
    52  
    53  	swapped = p.CompareAndSwap(uintptr(unsafe.Pointer(s2)), uintptr(unsafe.Pointer(s3)))
    54  	assert.False(t, swapped)
    55  	assert.Equal(t, p.Load(), uintptr(unsafe.Pointer(s3)))
    56  }