//go:build windows

package queue

import (
	"errors"
	"syscall"
)

// processAlive on Windows cannot use the kill(0) trick: os.FindProcess
// always returns a non-nil process and Signal(0) is unsupported. We
// conservatively report every pid as alive and rely on the mtime
// staleness window in lockIsStale to recover from a crashed run.
func processAlive(pid int) bool {
	return true
}

// errorSharingViolation (ERROR_SHARING_VIOLATION, 0x20) is not exported
// by the syscall package, so it is named locally.
const errorSharingViolation = syscall.Errno(0x20)

// isPendingDelete reports whether err is the transient rejection Windows
// raises when an exclusive create targets a lock file still in "delete
// pending" state — another invocation released it microseconds ago while
// a staleness probe held an open read handle. CreateFile returns
// ERROR_ACCESS_DENIED (or ERROR_SHARING_VIOLATION while a stray handle is
// still open) rather than reporting the file as existing, so acquireLock
// must treat it as contention, not a hard error.
func isPendingDelete(err error) bool {
	return errors.Is(err, syscall.ERROR_ACCESS_DENIED) ||
		errors.Is(err, errorSharingViolation)
}