NTSTATUS 0 (STATUS_WAIT_0): meaning and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: A WaitAny operation completed because dispatcher object index 0 became signaled.

Could be also:
Constant	Type	OS
ERROR_SUCCESS	Win32 error	Windows
STATUS_SUCCESS	NTSTATUS	Windows
kOSReturnSuccess	Kern return	Mac
KERN_SUCCESS	Kern return	Mac
MACH_MSG_SUCCESS	Kern return	Mac
ippStsNoErr	Intel Ipp Status	Any
S_OK	HRESULT	Windows
hrNone	HRESULT	Windows

Previous	Next
STATUS_SUCCESS	STATUS_WAIT_63

STATUS_WAIT_0

WaitAny selected the first dispatcher object

Native wait statuses encode the array index that satisfied a WaitAny operation. STATUS_WAIT_0 is the base value: index zero in the caller's object array became signaled. Win32 exposes the same index convention through the WAIT_OBJECT_0 return range.

The status identifies an array position, not an object type. The selected handle might refer to an event, process, thread, semaphore, mutex, timer, or another waitable object allowed by the API. Record the original handle array before translating the status; reordering handles changes the meaning of the same numeric result.

What to inspect

Preserve the exact wait array and WaitAny versus WaitAll mode.
Map the returned offset to the handle at index zero before consuming object-specific state.
Remember that satisfying a wait can modify semaphore counts or mutex ownership.

References

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