github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/pkg/refs/refcounter_state.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 refs
    16  
    17  // +stateify savable
    18  type savedReference struct {
    19  	obj interface{}
    20  }
    21  
    22  func (w *WeakRef) saveObj() savedReference {
    23  	// We load the object directly, because it is typed. This will be
    24  	// serialized and loaded as a typed value.
    25  	return savedReference{w.obj.Load()}
    26  }
    27  
    28  func (w *WeakRef) loadObj(v savedReference) {
    29  	// See note above. This will be serialized and loaded typed. So we're okay
    30  	// as long as refs aren't changing during save and load (which they should
    31  	// not be).
    32  	//
    33  	// w.user is loaded before loadObj is called.
    34  	w.init(v.obj.(RefCounter), w.user)
    35  }