Adjusts the state of a thread via a thread state object. This function offers a more resilient alternative mechanism to suspending threads, tying the duration of the operation to the lifetime of the state object.

Parameters

• ThreadStateChangeHandle - a handle to the thread state object created via NtCreateThreadStateChange. The handle must grant THREAD_STATE_CHANGE_STATE access.
• ThreadHandle - a handle to the associated thread which state should be changed. For suspend and resume operations, this handle must grant THREAD_SUSPEND_RESUME access.
• StateChangeType - the type of the operation to perform.
• ExtendedInformation - an optional pointer to a buffer with request-specific information. Currently unused.
• ExtendedInformationLength - the size of the provided buffer. Currently unused.
• Reserved - this parameter is unused and should be set to zero.

Operation types

For the list of supported operations, see THREAD_STATE_CHANGE_TYPE.

Remarks

Closing the thread state object handle via NtClose releases the reference. When the reference counter drops to zero, the system automatically undoes the effect of the state changes on the associated thread.

Related Win32 API

This functionality is not exposed in Win32 API.

Required OS version

This function was introduced in Windows 11.

See also

• NtCreateThreadStateChange
• NtOpenThread
• NtSuspendThread
• NtResumeThread
• NtChangeProcessState