/usr/share/gocode/src/github.com/couchbase/moss/mmap.go is in golang-github-couchbase-moss-dev 0.0~git20170914.0.07c86e8-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 | // Copyright (c) 2016 Couchbase, Inc.
// 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 moss
import (
"sync"
"github.com/edsrzf/mmap-go"
)
// mmapRef provides a ref-counting wrapper around a mmap handle.
type mmapRef struct {
fref *FileRef
mm mmap.MMap
buf []byte
m sync.Mutex // Protects the fields that follow.
refs int
ext interface{} // Extra user/associated data.
}
func (r *mmapRef) AddRef() *mmapRef {
if r == nil {
return nil
}
r.m.Lock()
r.refs++
r.m.Unlock()
return r
}
func (r *mmapRef) DecRef() error {
if r == nil {
return nil
}
r.m.Lock()
r.refs--
if r.refs <= 0 {
r.mm.Unmap()
r.mm = nil
r.buf = nil
r.fref.DecRef()
r.fref = nil
}
r.m.Unlock()
return nil
}
func (r *mmapRef) Close() error {
return r.DecRef()
}
func (r *mmapRef) SetExt(v interface{}) {
r.m.Lock()
r.ext = v
r.m.Unlock()
}
func (r *mmapRef) GetExt() (v interface{}) {
r.m.Lock()
v = r.ext
r.m.Unlock()
return
}
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