44 lines
1.0 KiB
Go
44 lines
1.0 KiB
Go
//go:build windows
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package instance
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import (
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"errors"
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"golang.org/x/sys/windows"
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)
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type windowsInstanceLock struct {
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handle windows.Handle
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}
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// tryAcquireInstanceLock 用共享模式为 0 的 CreateFile 独占锁文件：
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// 已被占用的锁文件会返回 ERROR_SHARING_VIOLATION，此时调用方继续扫描下一个槽位。
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func tryAcquireInstanceLock(path string) (instanceLock, bool, error) {
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handle, err := windows.CreateFile(
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windows.StringToUTF16Ptr(path),
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windows.GENERIC_READ|windows.GENERIC_WRITE,
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0,
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nil,
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windows.OPEN_ALWAYS,
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windows.FILE_ATTRIBUTE_NORMAL,
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0,
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)
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if err != nil {
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if errors.Is(err, windows.ERROR_SHARING_VIOLATION) || errors.Is(err, windows.ERROR_ACCESS_DENIED) {
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return nil, false, nil
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}
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return nil, false, err
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}
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return &windowsInstanceLock{handle: handle}, true, nil
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}
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func (l *windowsInstanceLock) Close() error {
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if l == nil || l.handle == windows.InvalidHandle {
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return nil
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}
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err := windows.CloseHandle(l.handle)
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l.handle = windows.InvalidHandle
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return err
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}
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