github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/pkg/atomicbitops/aligned_64bit.go (about)

     1  // Copyright 2021 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  // +build !arm,!mips,!386
    16  
    17  package atomicbitops
    18  
    19  import "sync/atomic"
    20  
    21  // AlignedAtomicInt64 is an atomic int64 that is guaranteed to be 64-bit
    22  // aligned, even on 32-bit systems. On most architectures, it's just a regular
    23  // int64.
    24  //
    25  // See aligned_unsafe.go in this directory for justification.
    26  //
    27  // +stateify savable
    28  type AlignedAtomicInt64 struct {
    29  	value int64
    30  }
    31  
    32  // Load is analagous to atomic.LoadInt64.
    33  func (aa *AlignedAtomicInt64) Load() int64 {
    34  	return atomic.LoadInt64(&aa.value)
    35  }
    36  
    37  // Store is analagous to atomic.StoreInt64.
    38  func (aa *AlignedAtomicInt64) Store(v int64) {
    39  	atomic.StoreInt64(&aa.value, v)
    40  }
    41  
    42  // Add is analagous to atomic.AddInt64.
    43  func (aa *AlignedAtomicInt64) Add(v int64) int64 {
    44  	return atomic.AddInt64(&aa.value, v)
    45  }
    46  
    47  // AlignedAtomicUint64 is an atomic uint64 that is guaranteed to be 64-bit
    48  // aligned, even on 32-bit systems. On most architectures, it's just a regular
    49  // uint64.
    50  //
    51  // See aligned_unsafe.go in this directory for justification.
    52  //
    53  // +stateify savable
    54  type AlignedAtomicUint64 struct {
    55  	value uint64
    56  }
    57  
    58  // Load is analagous to atomic.LoadUint64.
    59  func (aa *AlignedAtomicUint64) Load() uint64 {
    60  	return atomic.LoadUint64(&aa.value)
    61  }
    62  
    63  // Store is analagous to atomic.StoreUint64.
    64  func (aa *AlignedAtomicUint64) Store(v uint64) {
    65  	atomic.StoreUint64(&aa.value, v)
    66  }
    67  
    68  // Add is analagous to atomic.AddUint64.
    69  func (aa *AlignedAtomicUint64) Add(v uint64) uint64 {
    70  	return atomic.AddUint64(&aa.value, v)
    71  }