inet.af/netstack@v0.0.0-20220214151720-7585b01ddccf/atomicbitops/atomicbitops_noasm.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
    19  
    20  import (
    21  	"sync/atomic"
    22  )
    23  
    24  //go:nosplit
    25  func AndUint32(addr *uint32, val uint32) {
    26  	for {
    27  		o := atomic.LoadUint32(addr)
    28  		n := o & val
    29  		if atomic.CompareAndSwapUint32(addr, o, n) {
    30  			break
    31  		}
    32  	}
    33  }
    34  
    35  //go:nosplit
    36  func OrUint32(addr *uint32, val uint32) {
    37  	for {
    38  		o := atomic.LoadUint32(addr)
    39  		n := o | val
    40  		if atomic.CompareAndSwapUint32(addr, o, n) {
    41  			break
    42  		}
    43  	}
    44  }
    45  
    46  //go:nosplit
    47  func XorUint32(addr *uint32, val uint32) {
    48  	for {
    49  		o := atomic.LoadUint32(addr)
    50  		n := o ^ val
    51  		if atomic.CompareAndSwapUint32(addr, o, n) {
    52  			break
    53  		}
    54  	}
    55  }
    56  
    57  //go:nosplit
    58  func CompareAndSwapUint32(addr *uint32, old, new uint32) (prev uint32) {
    59  	for {
    60  		prev = atomic.LoadUint32(addr)
    61  		if prev != old {
    62  			return
    63  		}
    64  		if atomic.CompareAndSwapUint32(addr, old, new) {
    65  			return
    66  		}
    67  	}
    68  }
    69  
    70  //go:nosplit
    71  func AndUint64(addr *uint64, val uint64) {
    72  	for {
    73  		o := atomic.LoadUint64(addr)
    74  		n := o & val
    75  		if atomic.CompareAndSwapUint64(addr, o, n) {
    76  			break
    77  		}
    78  	}
    79  }
    80  
    81  //go:nosplit
    82  func OrUint64(addr *uint64, val uint64) {
    83  	for {
    84  		o := atomic.LoadUint64(addr)
    85  		n := o | val
    86  		if atomic.CompareAndSwapUint64(addr, o, n) {
    87  			break
    88  		}
    89  	}
    90  }
    91  
    92  //go:nosplit
    93  func XorUint64(addr *uint64, val uint64) {
    94  	for {
    95  		o := atomic.LoadUint64(addr)
    96  		n := o ^ val
    97  		if atomic.CompareAndSwapUint64(addr, o, n) {
    98  			break
    99  		}
   100  	}
   101  }
   102  
   103  //go:nosplit
   104  func CompareAndSwapUint64(addr *uint64, old, new uint64) (prev uint64) {
   105  	for {
   106  		prev = atomic.LoadUint64(addr)
   107  		if prev != old {
   108  			return
   109  		}
   110  		if atomic.CompareAndSwapUint64(addr, old, new) {
   111  			return
   112  		}
   113  	}
   114  }