NTSTATUS NTAPI NtSuspendThread	(	IN HANDLE	ThreadHandle,
		OUT PULONG PreviousSuspendCount	OPTIONAL
	)
Definition at line 347 of file state.c.
{
    PETHREAD Thread;
    ULONG Prev;
    KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
    NTSTATUS Status;
    PAGED_CODE();

    /* Check if caller gave a suspend count from user mode */
    if ((PreviousSuspendCount) && (PreviousMode != KernelMode))
    {
        /* Enter SEH for probing */
        _SEH2_TRY
        {
            /* Probe the count */
            ProbeForWriteUlong(PreviousSuspendCount);
        }
        _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
        {
            /* Return the exception code */
            _SEH2_YIELD(return _SEH2_GetExceptionCode());
        }
        _SEH2_END;
    }

    /* Get the Thread Object */
    Status = ObReferenceObjectByHandle(ThreadHandle,
                                       THREAD_SUSPEND_RESUME,
                                       PsThreadType,
                                       PreviousMode,
                                       (PVOID*)&Thread,
                                       NULL);
    if (!NT_SUCCESS(Status)) return Status;

    /* Call the internal function */
    Status = PsSuspendThread(Thread, &Prev);
    ObDereferenceObject(Thread);
    if (!NT_SUCCESS(Status)) return Status;

    /* Protect write with SEH */
    _SEH2_TRY
    {
        /* Return the Previous Count */
        if (PreviousSuspendCount) *PreviousSuspendCount = Prev;
    }
    _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
    {
        /* Get the exception code */
        Status = _SEH2_GetExceptionCode();
    }
    _SEH2_END;

    /* Return */
    return Status;
}
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