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os: use sync.OnceValue 

Simplify the code and reduce global variables.
This commit is contained in:
apocelipes 2024-10-21 23:18:12 +08:00
parent c1d9303d82
commit 7c9d409855
1 changed files with 4 additions and 8 deletions
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12
src/os/file_windows.go
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@ -223,17 +223,13 @@ func Pipe() (r *File, w *File, err error) {
return newFile(p[0], "|0", "pipe"), newFile(p[1], "|1", "pipe"), nil
}
var (
useGetTempPath2Once sync.Once
useGetTempPath2 bool
)
var useGetTempPath2 = sync.OnceValue(func() bool {
return windows.ErrorLoadingGetTempPath2() == nil
})
func tempDir() string {
useGetTempPath2Once.Do(func() {
useGetTempPath2 = (windows.ErrorLoadingGetTempPath2() == nil)
})
getTempPath := syscall.GetTempPath
if useGetTempPath2 {
if useGetTempPath2() {
getTempPath = windows.GetTempPath2
}
n := uint32(syscall.MAX_PATH)