golang sysdll 代码
文件路径：/src/internal/syscall/windows/sysdll/sysdll.go
/ Copyright 2016 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 sysdll is an internal leaf package that records and reports
/ which Windows DLL names are used by Go itself. These DLLs are then
/ only loaded from the System32 directory. See Issue 14959.
package sysdll
/ IsSystemDLL reports whether the named dll key (a base name, like
/ "foo.dll") is a system DLL which should only be loaded from the
/ Windows SYSTEM32 directory.
/
/ Filenames are case sensitive, but that doesn't matter because
/ the case registered with Add is also the same case used with
/ LoadDLL later.
/
/ It has no associated mutex and should only be mutated serially
/ (currently: during init), and not concurrent with DLL loading.
var IsSystemDLL = map[string]bool{}
/ Add notes that dll is a system32 DLL which should only be loaded
/ from the Windows SYSTEM32 directory. It returns its argument back,
/ for ease of use in generated code.
func Add(dll string) string {
IsSystemDLL[dll] = true
return dll
}