go filelock_windows 源码
golang filelock_windows 代码
文件路径：/src/cmd/go/internal/lockedfile/internal/filelock/filelock_windows.go
// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build windows
package filelock
import (
"internal/syscall/windows"
"io/fs"
"syscall"
)
type lockType uint32
const (
readLock lockType = 0
writeLock lockType = windows.LOCKFILE_EXCLUSIVE_LOCK
)
const (
reserved = 0
allBytes = ^uint32(0)
)
func lock(f File, lt lockType) error {
// Per https://golang.org/issue/19098, “Programs currently expect the Fd
// method to return a handle that uses ordinary synchronous I/O.”
// However, LockFileEx still requires an OVERLAPPED structure,
// which contains the file offset of the beginning of the lock range.
// We want to lock the entire file, so we leave the offset as zero.
ol := new(syscall.Overlapped)
err := windows.LockFileEx(syscall.Handle(f.Fd()), uint32(lt), reserved, allBytes, allBytes, ol)
if err != nil {
return &fs.PathError{
Op: lt.String(),
Path: f.Name(),
Err: err,
}
}
return nil
}
func unlock(f File) error {
ol := new(syscall.Overlapped)
err := windows.UnlockFileEx(syscall.Handle(f.Fd()), reserved, allBytes, allBytes, ol)
if err != nil {
return &fs.PathError{
Op: "Unlock",
Path: f.Name(),
Err: err,
}
}
return nil
}
func isNotSupported(err error) bool {
switch err {
case windows.ERROR_NOT_SUPPORTED, windows.ERROR_CALL_NOT_IMPLEMENTED, ErrNotSupported:
return true
default:
return false
}
}
相关信息
相关文章
0
赞
热门推荐
-
2、 - 优质文章
-
3、 gate.io
-
8、 golang
-
9、 openharmony
-
10、 Vue中input框自动聚焦