github.com/zuoyebang/bitalosdb@v1.1.1-0.20240516111551-79a8c4d8ce20/internal/cache/lrucache/value_invariants.go (about)

     1  // Copyright 2021 The Bitalosdb author(hustxrb@163.com) and other contributors.
     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 (invariants && !race) || (tracing && !race)
    16  // +build invariants,!race tracing,!race
    17  
    18  package lrucache
    19  
    20  import (
    21  	"fmt"
    22  	"os"
    23  
    24  	"github.com/zuoyebang/bitalosdb/internal/invariants"
    25  	"github.com/zuoyebang/bitalosdb/internal/manual"
    26  )
    27  
    28  func newValue(n int) *Value {
    29  	if n == 0 {
    30  		return nil
    31  	}
    32  	b := manual.New(n)
    33  	v := &Value{buf: b}
    34  	v.ref.init(1)
    35  	invariants.SetFinalizer(v, func(obj interface{}) {
    36  		v := obj.(*Value)
    37  		if v.buf != nil {
    38  			fmt.Fprintf(os.Stderr, "%p: cache value was not freed: refs=%d\n%s",
    39  				v, v.refs(), v.ref.traces())
    40  			os.Exit(1)
    41  		}
    42  	})
    43  	return v
    44  }
    45  
    46  func (v *Value) free() {
    47  	for i := range v.buf {
    48  		v.buf[i] = 0xff
    49  	}
    50  	manual.Free(v.buf)
    51  	v.buf = nil
    52  }