 
        #ifndef _NTIOAPI_H
typedef struct _IO_COMPLETION_BASIC_INFORMATION
{
    LONG Depth;
} IO_COMPLETION_BASIC_INFORMATION, *PIO_COMPLETION_BASIC_INFORMATION;
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Structure IO_COMPLETION_BASIC_INFORMATION is used as result of call NtQueryIoCompletion with IoCompletionBasicInformation information class.
Number of currently pending file operations for specified IO Completion Object.