86 lines
2.3 KiB
C++
86 lines
2.3 KiB
C++
//----------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1995 - 1996.
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//
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// File: dll.hxx
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//
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// Contents: Classes for maintaining reference counts required to
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// implement
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//
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// Classes: CDll
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// CDllRef
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//
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// History: 06-26-1997 MarkBl Heisted from the eventlog snapin.
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//
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//----------------------------------------------------------------------------
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#ifndef __DLLREF_HXX_
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#define __DLLREF_HXX_
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//+---------------------------------------------------------------------------
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//
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// Class: CDll
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//
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// Purpose: Maintains reference and lock counts.
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//
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// History: 08-14-96 DavidMun Created
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//
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// Notes: Everything in this class is static, so nowhere is there an
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// instantiation of this class.
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//
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//----------------------------------------------------------------------------
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class CDll
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{
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public:
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static ULONG AddRef() { return InterlockedIncrement((LONG*)&s_cObjs); }
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static ULONG Release() { return InterlockedDecrement((LONG*)&s_cObjs); }
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static void LockServer(BOOL fLock) {
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fLock ? InterlockedIncrement((LONG*)&s_cLocks)
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: InterlockedDecrement((LONG*)&s_cLocks);
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}
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static HRESULT CanUnloadNow(void) {
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if (0L == s_cObjs && 0L == s_cLocks)
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{
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Dbg(DEB_TRACE, "Can unload\n");
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return S_OK;
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}
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Dbg(DEB_TRACE,
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"Can NOT unload, %u objects, %u locks\n",
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s_cObjs,
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s_cLocks);
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return S_FALSE;
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}
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static ULONG s_cObjs;
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static ULONG s_cLocks;
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}; // class CDll
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//+---------------------------------------------------------------------------
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//
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// Class: CDllRef
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//
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// Purpose: Helper class to automatically maintain object count.
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//
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// History: 08-14-96 DavidMun Created
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//
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// Notes: All objects returned to the outside world should contain
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// a CDllRef member.
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//
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//----------------------------------------------------------------------------
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class CDllRef
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{
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public:
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CDllRef(void) { CDll::AddRef(); }
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~CDllRef(void) { CDll::Release(); }
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}; // class CDllRef
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#endif // __DLLREF_HXX_
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