mirror of
https://github.com/gnif/LookingGlass.git
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104 lines
2.6 KiB
C
104 lines
2.6 KiB
C
/**
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* Looking Glass
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* Copyright © 2017-2023 The Looking Glass Authors
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* https://looking-glass.io
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc., 59
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* Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _H_COMREF_
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#define _H_COMREF_
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#include <stdbool.h>
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#include <windows.h>
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#include <malloc.h>
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#include "common/locking.h"
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/**
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* These functions are to assist in tracking and releasing COM objects
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*/
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typedef struct ComScope ComScope;
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struct ComScope
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{
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bool threadSafe;
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LG_Lock lock;
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unsigned size;
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unsigned used;
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struct
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{
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IUnknown *** ptr;
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IUnknown * ref;
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}
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* refs;
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void (*free)(void * ptr);
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};
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void comRef_initScope(unsigned size, ComScope ** instance,
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void *(allocFn)(size_t size), void (freeFn)(void * ptr), bool threadSafe);
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void comRef_freeScope(ComScope ** instance);
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IUnknown ** comRef_new(ComScope * scope, IUnknown *** dst);
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#define comRef_initGlobalScope(size, scope) \
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comRef_initScope((size), &(scope), malloc, free, true)
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#define comRef_freeGlobalScope(scope) \
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comRef_freeScope(&(scope))
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#define comRef_scopePush(size) \
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ComScope * _comRef_localScope = alloca(sizeof(*_comRef_localScope) + \
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sizeof(*(_comRef_localScope->refs)) * size); \
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comRef_initScope(size, &_comRef_localScope, NULL, NULL, false);
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#define comRef_scopePop() \
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comRef_freeScope(&_comRef_localScope)
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#define comRef_defineLocal(type, name) \
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type ** name = NULL; \
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comRef_new(_comRef_localScope, (IUnknown ***)&(name));
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#define _comRef_toGlobal(globalScope, dst, src) \
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{ \
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IUnknown ** global = comRef_new((globalScope), (IUnknown ***)&(dst)); \
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*global = (IUnknown *)*(src); \
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*(src) = NULL; \
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}
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/**
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* Release a COM reference immediately
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* This is just a helper, the ref is still tracked if used again
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*/
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inline static ULONG comRef_release(IUnknown ** ref)
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{
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if (!ref)
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return 0;
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ULONG count = 0;
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if (*ref)
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count = IUnknown_Release(*ref);
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*ref = NULL;
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return count;
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}
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#define comRef_release(ref) comRef_release((IUnknown **)(ref))
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#endif
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