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ERROR_WAIT_3
Indexed wait completion for object 3
ERROR_WAIT_3 is Windows system result 733 (0x000002DD). The value is useful only after the fourth array entry is identified.
This result means object index 3 satisfied a wait-any operation. It frequently exposes a maintenance, timer, child-process, or auxiliary event added after the original three-handle design.
Where this value belongs
- A dispatcher has at least four waitable objects.
- A child-process or timer handle occupies the fourth slot.
- Compatibility diagnostics preserve the encoded index as it.
An out-of-date three-entry dispatch table is a practical risk. The wait itself can succeed while application code has no valid handler for index 3.
Common interpretation mistakes
- It is mishandled when the code indexes beyond a three-element callback table.
- It is mishandled when the fourth handle is conditionally present but the handler assumes a fixed layout.
- It is mishandled when the array count passed to the wait differs from the count used for bounds checking.
- It is mishandled when a fourth object is removed without changing persisted index labels.
Diagnostic sequence
- Log the count supplied to the wait and prove it is at least four.
- Verify index 3 maps to the fourth object in the same array instance.
- Check dispatch-table bounds before dereferencing handler 3.
- Inspect conditional array construction for missing or extra objects.
- Signal only the fourth object in a controlled test.
- Confirm handling index 3 does not accidentally consume or reset another event.
Evidence worth keeping
- preserve wait count and callback-table count.
- preserve fourth object label and handle value.
- preserve conditions controlling inclusion of object 3.
- preserve bounds-check result and selected handler.
- preserve post-dispatch event state.
A complete it record should make an out-of-range dispatch impossible to hide by including both wait_count and dispatch_count.
Correct handling and recovery
Validate index 3 against every related table, then invoke the fourth object’s handler. If no handler exists, stop the loop safely and treat the application layout as defective.
A corrected dispatcher can wait again. Continuing with an unchecked index risks memory corruption and is not an availability retry problem.
Difference from nearby values
ERROR_WAIT_63 is the upper marker for a 64-object set. It is ordinary indexed completion but often reveals the first slot added beyond a legacy three-object layout.
Practical scenario
A service adds a child-process handle after stop, reload, and queue events. The wait returns it, while an old callback array still contains three entries; a bounds check catches the defect instead of calling arbitrary memory.
Implementation guidance
Tie the handle count, labels, and handlers to one container. Fuzz tests should vary conditional members and assert that every possible index has exactly one valid action.
Record wait_3_wait_count, wait_3_dispatch_count, wait_3_fourth_object, wait_3_condition_flags, and wait_3_bounds_valid.
References
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