140 lines
2.6 KiB
C
140 lines
2.6 KiB
C
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/*++
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Copyright (c) 1998 Microsoft Corporation
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Module Name:
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refcnt.h
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Abstract:
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Reference counting for an object.
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Author:
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Scott Holden (sholden) 12/29/1998 Borrowed from IrDA.
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Revision History:
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--*/
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#ifndef _REFCNT_H_
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#define _REFCNT_H_
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#ifdef NDIS40 // Only used for NDIS40 code now.
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#define TAG_CNT 8
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#define REF_SIG 0x7841eeee
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#if DBG
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typedef struct _REF_TAG
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{
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ULONG Tag;
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LONG Count;
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} REF_TAG;
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#endif
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typedef struct _REF_CNT
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{
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LONG Count;
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PVOID Instance;
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VOID (*DeleteHandler)(PVOID pvContext);
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#if DBG
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int Sig;
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REF_TAG Tags[TAG_CNT];
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KSPIN_LOCK Lock;
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ULONG TypeTag;
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#endif // DBG
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}
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REF_CNT, *PREF_CNT;
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//
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// ReferenceInit - Initialize the reference control block.
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//
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_inline VOID
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ReferenceInit(
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IN PREF_CNT pRefCnt,
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PVOID InstanceHandle,
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VOID (*DeleteHandler)(PVOID pvContext)
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)
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{
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pRefCnt->Count = 0;
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pRefCnt->Instance = InstanceHandle;
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pRefCnt->DeleteHandler = DeleteHandler;
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}
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//
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// ReferenceAdd - Add a reference.
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//
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_inline VOID
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ReferenceAdd(
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IN PREF_CNT pRefCnt
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)
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{
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InterlockedIncrement(&pRefCnt->Count);
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}
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//
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// ReferenceRemove - Del a reference. If the reference is zero, and a
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// delete handler has been specified, then call the
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// handler.
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//
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_inline VOID
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ReferenceRemove(
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IN PREF_CNT pRefCnt
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)
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{
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if (InterlockedDecrement(&pRefCnt->Count) <= 0 &&
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pRefCnt->DeleteHandler)
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{
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(pRefCnt->DeleteHandler)(pRefCnt->Instance);
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}
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}
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#if DBG
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//
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// For checked builds, we will do some verification with tags, etc to ensure
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// that the ref counting is done correctly.
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//
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VOID
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ReferenceInitDbg(
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IN PREF_CNT pRefCnt,
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PVOID InstanceHandle,
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VOID (*DeleteHandler)(PVOID pvContext),
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ULONG TypeTag
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);
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VOID
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ReferenceAddDbg(
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PREF_CNT pRefCnt,
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ULONG Tag,
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int cLine
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);
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VOID
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ReferenceRemoveDbg(
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PREF_CNT pRefCnt,
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ULONG Tag,
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int cLine
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);
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#define REFINIT(Rc, Inst, DelHandler, Tag) ReferenceInitDbg(Rc, Inst, DelHandler, Tag)
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#define REFADD(Rc, Tag) ReferenceAddDbg(Rc, Tag, __LINE__)
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#define REFDEL(Rc, Tag) ReferenceRemoveDbg(Rc, Tag, __LINE__)
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#else // DBG
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#define REFINIT(Rc, Inst, DelHandler, Tag) ReferenceInit(Rc, Inst, DelHandler)
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#define REFADD(Rc, Tag) ReferenceAdd(Rc);
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#define REFDEL(Rc, Tag) ReferenceRemove(Rc);
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#endif // !DBG
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#endif // NDIS40
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#endif // _REFCNT_H_
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