86 lines
1.7 KiB
C
86 lines
1.7 KiB
C
/*++
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Copyright (c) 1996-1999 Microsoft Corporation
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Module Name:
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refcnt.h
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Abstract:
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Author:
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Edward Buchwalter (v-edbuc) 15-Aug-1996
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Revision History:
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Shreedhar Madhavapeddi (ShreeM) 16-April-1999 Adapted for GPC.
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Rajesh Sundaram (rajeshsu) 05-Aug-1999 Adapted for psched.
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--*/
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#ifndef REFCNT_H
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#define REFCNT_H
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//
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// Reference Count Control Block
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//
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// Elements:
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//
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// - Count: number of outstanding references
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// - Instance: user supplied context
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// - UserDeleteFunc: user supplied delete function
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//
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#define TAG_CNT 10
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#define REF_SIG 0x7841eeee
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typedef struct
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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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typedef struct reference_count_control
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{
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LONG Count;
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PVOID Instance;
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VOID (*DeleteHandler)( PVOID, BOOLEAN );
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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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CTELock Lock;
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#endif
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} REF_CNT, *PREF_CNT;
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VOID
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ReferenceInit
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(
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IN PREF_CNT pRefCnt,
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PVOID InstanceHandle,
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VOID (*DeleteHandler)( PVOID , BOOLEAN)
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);
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#define REFINIT(Rc, I, h) ReferenceInit(Rc, I, h)
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#if DBG
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VOID ReferenceAddDbg(PREF_CNT pRefCnt, ULONG Tag);
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VOID ReferenceRemoveDbg(PREF_CNT pRefCnt, BOOLEAN Locked, ULONG Tag);
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#define REFADD(Rc, Tag) ReferenceAddDbg(Rc, Tag);
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#define REFDEL(Rc, LockHeld, Tag) ReferenceRemoveDbg(Rc, LockHeld, Tag)
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#else
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#define REFADD(Rc, Tag) InterlockedIncrement(&(Rc)->Count);
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#define REFDEL(Rc, LockHeld, Tag) \
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if (InterlockedDecrement(&(Rc)->Count) == 0 ) \
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((Rc)->DeleteHandler)( (Rc)->Instance , (LockHeld));
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#endif
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#endif
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