github.com/FlowerWrong/netstack@v0.0.0-20191009141956-e5848263af28/tcpip/link/sharedmem/sharedmem_unsafe.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  package sharedmem
    16  
    17  import (
    18  	"unsafe"
    19  )
    20  
    21  // sharedDataPointer converts the shared data slice into a pointer so that it
    22  // can be used in atomic operations.
    23  func sharedDataPointer(sharedData []byte) *uint32 {
    24  	return (*uint32)(unsafe.Pointer(&sharedData[0:4][0]))
    25  }