NDIS_PD_FREE_QUEUE callback function

Description

The PacketDirect (PD) platform calls a PD-capable miniport driver's NdisPDFreeQueue function to free a queue.

Note You must declare the function by using the NDIS_PD_FREE_QUEUE type. For more information, see the following Examples section.

Parameters

NdisPDQueue [in]

Any empty queue that needs to be freed from memory. For more information, see the NDIS_PD_QUEUE structure.

Return value

This callback function does not return a value.

Remarks

The caller is responsible for ensuring that the PD queue is empty before issuing this call. Caller is also responsible for clearing all filters that target this queue before closing the queue.

Examples

To define a NdisPDFreeQueue function, you must first provide a function declaration that identifies the type of function you're defining. Windows provides a set of function types for drivers. Declaring a function using the function types helps Code Analysis for Drivers, Static Driver Verifier (SDV), and other verification tools find errors, and it's a requirement for writing drivers for the Windows operating system.

For example, to define a NdisPDFreeQueue function that is named "MyPDFreeQueue", use the NDIS_PD_FREE_QUEUE type as shown in this code example:

NDIS_PD_FREE_QUEUE MyPDFreeQueue;

Then, implement your function as follows:

_Use_decl_annotations_
VOID
 MyPDFreeQueue(
    NDIS_PD_QUEUE*  NdisPDQueue
    )
  {...}

The NDIS_PD_FREE_QUEUE function type is defined in the Ntddndis.h header file. To more accurately identify errors when you run the code analysis tools, be sure to add the _Use_decl_annotations_ annotation to your function definition. The _Use_decl_annotations_ annotation ensures that the annotations that are applied to the NDIS_PD_FREE_QUEUE function type in the header file are used. For more information about the requirements for function declarations, see Declaring Functions by Using Function Role Types for NDIS Drivers.

For information about _Use_decl_annotations_, see Annotating Function Behavior.