Added a freelist package.
parent
9232b8275f
commit
5b5d8ff8be
|
@ -0,0 +1,40 @@
|
||||||
|
// Copyright 2015 Google Inc. All Rights Reserved.
|
||||||
|
//
|
||||||
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
||||||
|
// you may not use this file except in compliance with the License.
|
||||||
|
// You may obtain a copy of the License at
|
||||||
|
//
|
||||||
|
// http://www.apache.org/licenses/LICENSE-2.0
|
||||||
|
//
|
||||||
|
// Unless required by applicable law or agreed to in writing, software
|
||||||
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
||||||
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||||
|
// See the License for the specific language governing permissions and
|
||||||
|
// limitations under the License.
|
||||||
|
|
||||||
|
package freelist
|
||||||
|
|
||||||
|
import "unsafe"
|
||||||
|
|
||||||
|
// A freelist for arbitrary pointers. Not safe for concurrent access.
|
||||||
|
type Freelist struct {
|
||||||
|
list []unsafe.Pointer
|
||||||
|
}
|
||||||
|
|
||||||
|
// Get an element from the freelist, returning nil if empty.
|
||||||
|
func (fl *Freelist) Get() (p unsafe.Pointer) {
|
||||||
|
l := len(fl.list)
|
||||||
|
if l == 0 {
|
||||||
|
return
|
||||||
|
}
|
||||||
|
|
||||||
|
p = fl.list[l-1]
|
||||||
|
fl.list = fl.list[:l-1]
|
||||||
|
|
||||||
|
return
|
||||||
|
}
|
||||||
|
|
||||||
|
// Contribute an element back to the freelist.
|
||||||
|
func (fl *Freelist) Put(p unsafe.Pointer) {
|
||||||
|
fl.list = append(fl.list, p)
|
||||||
|
}
|
Loading…
Reference in New Issue