fxrequestcallbacks.hpp

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/*++
 
Copyright (c) Microsoft Corporation
 
Module Name:
 
    FxIoQueueCallbacks.h
 
Abstract:
 
    This module implements the I/O package queue object callbacks
 
Author:
 
 
 
 
Environment:
 
    Both kernel and user mode
 
Revision History:
 
--*/
 
#ifndef _FXREQUESTCALLBACKS_H_
#define _FXREQUESTCALLBACKS_H_
 
 
//
// Delegate which contains EvtRequestCancel
//
class FxRequestCancelCallback : public FxCallback {
 
public:
    PFN_WDF_REQUEST_CANCEL m_Cancel;
 
    FxRequestCancelCallback(
        VOID
        )
    {
        m_Cancel = NULL;
    }
 
    void
    InvokeCancel(
        __in FxCallbackLock* Lock,
        __in WDFREQUEST Request
        )
    {
        if (m_Cancel != NULL) {
            PFN_WDF_REQUEST_CANCEL pMethod;
            KIRQL irql;
 
            //
            // Satisfy W4 warning, even though it is technically not necessary to
            // assign an initial value.
            //
            irql = PASSIVE_LEVEL;
 
            if (Lock != NULL) {
                Lock->Lock(&irql);
            }
 
            //
            // Clear the value before invoking the routine since the assignment
            // is invalidated when the routine is run.
            //
            pMethod = m_Cancel;
            m_Cancel = NULL;
 
            pMethod(Request);
 
            if (Lock != NULL) {
                Lock->Unlock(irql);
            }
        }
    }
};
 
//
// Delegate which contains EvtRequestCompletion
//
class FxRequestCompletionCallback : public FxCallback {
 
public:
    PFN_WDF_REQUEST_COMPLETION_ROUTINE m_Completion;
 
    FxRequestCompletionCallback(
        VOID
        )
    {
        m_Completion = NULL;
    }
};
 
 
#endif // _FXREQUESTCALLBACKS_H_