fxpagedobject.hpp

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/*++
 
Copyright (c) Microsoft Corporation
 
Module Name:
 
    FxPagedObject.hpp
 
Abstract:
 
    This module defines the abstract FxPagedObject class.
 
Author:
 
 
 
--*/
 
#ifndef _FXPAGEDOBJECT_H_
#define _FXPAGEDOBJECT_H_
 
class FxPagedObject : public FxObject
{
private:
    MxPagedLock* m_Lock;
 
public:
 
    FxPagedObject(
        __in WDFTYPE Type,
        __in USHORT Size,
        __in PFX_DRIVER_GLOBALS FxDriverGlobals
        ) :
        FxObject(Type, Size, FxDriverGlobals)
    {
        m_Lock = NULL;
 
        // no need to hold the lock while the object is being constructed
        MarkPassiveCallbacks(ObjectDoNotLock);
    }
 
    virtual
    ~FxPagedObject(
        VOID
        )
    {
        if (m_Lock != NULL) {
            FxPoolFree(m_Lock);
            m_Lock = NULL;
        }
    }
 
    VOID
    Lock(
        VOID
        )
    {
        m_Lock->Acquire();
    }
 
    VOID
    Unlock(
        VOID
        )
    {
        m_Lock->Release();
    }
 
    _Must_inspect_result_
    NTSTATUS
    Initialize(
        VOID
        )
    {
        PFX_DRIVER_GLOBALS fxDriverGlobals;
 
        fxDriverGlobals = GetDriverGlobals();
        m_Lock = (MxPagedLock*) FxPoolAllocate(fxDriverGlobals,
                                               NonPagedPool,
                                               sizeof(MxPagedLock));
        if (m_Lock != NULL) {
            return m_Lock->Initialize();
        }
        else {
            return STATUS_INSUFFICIENT_RESOURCES;
        }
    }
};
 
#endif //  _FXPAGEDOBJECT_H_