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ERROR_ALREADY_WAITING
The legacy Winspool WaitForPrinterChange interface waits for a set of printer changes using a printer handle. This status identifies a synchronization mistake around that handle: another wait is already associated with it.
Modern Win32 documentation also exposes FindFirstPrinterChangeNotification, which creates a separate change-notification object that can be passed to normal wait functions and then reset with FindNextPrinterChangeNotification. That model makes the lifetime of the subscription and wait object explicit.
Concurrency points to inspect
- Find every thread that shares the same printer handle and records a printer-change wait.
- Do not assume a Winspool printer handle is safe for unsynchronized concurrent use; APIs such as AddPrinter explicitly document returned printer handles as not thread safe.
- Pair each change-notification object with its close operation and keep the underlying printer handle valid until notification monitoring ends.
- Prefer one owned notification subscription per monitoring component rather than stacking waits on a shared handle.
WaitForPrinterChange · FindFirstPrinterChangeNotification · AddPrinter handle synchronization note
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