ERROR_INVALID_AT_INTERRUPT_TIME - 104 (0x68)
Cannot request exclusive semaphores at interrupt time.
Updated: Feb 21, 2026
Technical Meaning
The error code ERROR_INVALID_AT_INTERRUPT_TIME (104, 0x68) indicates that an attempt was made to request exclusive semaphores at a time when such operations are not allowed. This typically occurs during interrupt handling or other contexts where the system does not permit certain types of synchronization primitives.
Error Details
This error is specific to scenarios involving interrupts and synchronization mechanisms within the Windows operating system. Semaphores, which are used for interprocess communication and synchronization, cannot be requested in an environment that is already executing at interrupt time due to potential race conditions and resource management issues.
Usage Context
The context where this error might occur includes:
- Interrupt service routines (ISRs)
- Kernel-mode drivers handling interrupts
- Synchronization operations that are not designed to run within the interrupt context
Developer Interpretation
Developers should be aware of the limitations imposed by the operating system on certain synchronization primitives when executing in an interrupt context. This error suggests that a function or operation was invoked at a time when it is not permitted, likely due to a mismatch between the intended usage and the current execution environment.
Related Errors
ERROR_INVALID_FUNCTION(1)STATUS_UNSUCCESSFUL(0xC0000001)
FAQ
Q: What does this error mean?
A: This error indicates that an attempt was made to request exclusive semaphores during interrupt handling, which is not allowed.
Q: How can I avoid this error?
A: Ensure that synchronization operations are performed in the appropriate context and do not invoke such operations within interrupt service routines or other contexts where they are not permitted.
Summary
The ERROR_INVALID_AT_INTERRUPT_TIME (104, 0x68) is a specific error code indicating an attempt to request exclusive semaphores at a time when it is not allowed. Developers should be mindful of the execution context and ensure that synchronization operations are performed correctly within the appropriate environment.