ERROR_USER_APC (737) - Windows Error Code Reference

Technical Meaning

The error code ERROR_USER_APC with the numeric value 737 and hexadecimal representation 0x2E1 is returned when an invalid user asynchronous procedure call (APC) operation occurs. This error typically indicates a problem in the handling of APCs by user-mode applications or drivers.

Error Details

An APC, or Asynchronous Procedure Call, is a mechanism that allows a thread to be interrupted and have a function called at a later time. User APCs are asynchronous procedures that can be posted to a thread from kernel mode. If an invalid operation is performed with respect to user APCs, this error code may be returned.

Usage Context

This error code is relevant in scenarios where user-mode applications or drivers attempt to post or handle user APCs. It could occur during the execution of functions that involve asynchronous operations, such as those related to I/O or thread management.

Developer Interpretation

When encountering ERROR_USER_APC, developers should consider the following:

Ensure that all operations involving user APCs are performed correctly and in accordance with the documented API behavior.
Verify that threads are properly configured to handle APCs.
Check for any invalid parameters or incorrect usage of functions related to APC handling.

Related Errors

ERROR_INVALID_PARAMETER (0x57)
STATUS_APC_MISMATCH (0xC000021D)
STATUS_USER_APC (0xC0000234)

FAQ

Q: What does the ERROR_USER_APC error mean?

A: It indicates an invalid user APC operation, such as posting or handling an APC incorrectly.

Q: How can I resolve this issue?

A: Review and correct any operations involving user APCs to ensure they are performed correctly according to the API documentation.

Summary

ERROR_USER_APC is a specific error code that indicates issues with user APC operations. Developers should carefully review their use of asynchronous procedure calls to avoid this error.