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helper_nowin.go
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helper_nowin.go
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// +build !windows
/*
Nging is a toolbox for webmasters
Copyright (C) 2021-present Wenhui Shen <swh@admpub.com>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package flock
import (
"os"
"syscall"
)
// LockEx 独占锁(独占读和写),非阻塞模式,获取失败直接返回错误
func LockEx(f *os.File) error {
return syscall.Flock(int(f.Fd()), syscall.LOCK_EX|syscall.LOCK_NB)
}
// LockExBlock 独占锁,阻塞模式,获取不到时阻塞等待直至成功
func LockExBlock(f *os.File) error {
return syscall.Flock(int(f.Fd()), syscall.LOCK_EX)
}
// Lock 共享锁(支持多读),非阻塞模式,获取失败直接返回错误
func Lock(f *os.File) error {
return syscall.Flock(int(f.Fd()), syscall.LOCK_SH|syscall.LOCK_NB)
}
// LockBlock 共享锁,阻塞模式,获取不到时阻塞等待直至成功
func LockBlock(f *os.File) error {
return syscall.Flock(int(f.Fd()), syscall.LOCK_SH)
}
// Unlock 解锁
func Unlock(f *os.File) error {
return syscall.Flock(int(f.Fd()), syscall.LOCK_UN)
}
// UnlockAndClose 解锁并关闭文件
func UnlockAndClose(f *os.File) error {
defer f.Close()
return syscall.Flock(int(f.Fd()), syscall.LOCK_UN)
}