inet.af/netstack@v0.0.0-20220214151720-7585b01ddccf/atomicbitops/atomicbitops.go (about)

     1  // Copyright 2018 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  //go:build amd64 || arm64
    16  // +build amd64 arm64
    17  
    18  // Package atomicbitops provides extensions to the sync/atomic package.
    19  //
    20  // All read-modify-write operations implemented by this package have
    21  // acquire-release memory ordering (like sync/atomic).
    22  package atomicbitops
    23  
    24  // AndUint32 atomically applies bitwise AND operation to *addr with val.
    25  func AndUint32(addr *uint32, val uint32)
    26  
    27  // OrUint32 atomically applies bitwise OR operation to *addr with val.
    28  func OrUint32(addr *uint32, val uint32)
    29  
    30  // XorUint32 atomically applies bitwise XOR operation to *addr with val.
    31  func XorUint32(addr *uint32, val uint32)
    32  
    33  // CompareAndSwapUint32 is like sync/atomic.CompareAndSwapUint32, but returns
    34  // the value previously stored at addr.
    35  func CompareAndSwapUint32(addr *uint32, old, new uint32) uint32
    36  
    37  // AndUint64 atomically applies bitwise AND operation to *addr with val.
    38  func AndUint64(addr *uint64, val uint64)
    39  
    40  // OrUint64 atomically applies bitwise OR operation to *addr with val.
    41  func OrUint64(addr *uint64, val uint64)
    42  
    43  // XorUint64 atomically applies bitwise XOR operation to *addr with val.
    44  func XorUint64(addr *uint64, val uint64)
    45  
    46  // CompareAndSwapUint64 is like sync/atomic.CompareAndSwapUint64, but returns
    47  // the value previously stored at addr.
    48  func CompareAndSwapUint64(addr *uint64, old, new uint64) uint64