nuclear@3: /************************************************************************************
nuclear@3: 
nuclear@3: Filename    :   OVR_RefCount.cpp
nuclear@3: Content     :   Reference counting implementation
nuclear@3: Created     :   September 19, 2012
nuclear@3: Notes       : 
nuclear@3: 
nuclear@3: Copyright   :   Copyright 2012 Oculus VR, Inc. All Rights reserved.
nuclear@3: 
nuclear@3: Use of this software is subject to the terms of the Oculus license
nuclear@3: agreement provided at the time of installation or download, or which
nuclear@3: otherwise accompanies this software in either electronic or hard copy form.
nuclear@3: 
nuclear@3: ************************************************************************************/
nuclear@3: 
nuclear@3: #include "OVR_RefCount.h"
nuclear@3: #include "OVR_Atomic.h"
nuclear@3: #include "OVR_Log.h"
nuclear@3: 
nuclear@3: namespace OVR {
nuclear@3: 
nuclear@3: #ifdef OVR_CC_ARM
nuclear@3: void* ReturnArg0(void* p)
nuclear@3: {
nuclear@3:     return p;
nuclear@3: }
nuclear@3: #endif
nuclear@3: 
nuclear@3: // ***** Reference Count Base implementation
nuclear@3: 
nuclear@3: RefCountImplCore::~RefCountImplCore()
nuclear@3: {
nuclear@3:     // RefCount can be either 1 or 0 here.
nuclear@3:     //  0 if Release() was properly called.
nuclear@3:     //  1 if the object was declared on stack or as an aggregate.
nuclear@3:     OVR_ASSERT(RefCount <= 1);
nuclear@3: }
nuclear@3: 
nuclear@3: #ifdef OVR_BUILD_DEBUG
nuclear@3: void RefCountImplCore::reportInvalidDelete(void *pmem)
nuclear@3: {
nuclear@3:     OVR_DEBUG_LOG(
nuclear@3:         ("Invalid delete call on ref-counted object at %p. Please use Release()", pmem));
nuclear@3:     OVR_ASSERT(0);
nuclear@3: }
nuclear@3: #endif
nuclear@3: 
nuclear@3: RefCountNTSImplCore::~RefCountNTSImplCore()
nuclear@3: {
nuclear@3:     // RefCount can be either 1 or 0 here.
nuclear@3:     //  0 if Release() was properly called.
nuclear@3:     //  1 if the object was declared on stack or as an aggregate.
nuclear@3:     OVR_ASSERT(RefCount <= 1);
nuclear@3: }
nuclear@3: 
nuclear@3: #ifdef OVR_BUILD_DEBUG
nuclear@3: void RefCountNTSImplCore::reportInvalidDelete(void *pmem)
nuclear@3: {
nuclear@3:     OVR_DEBUG_LOG(
nuclear@3:         ("Invalid delete call on ref-counted object at %p. Please use Release()", pmem));
nuclear@3:     OVR_ASSERT(0);
nuclear@3: }
nuclear@3: #endif
nuclear@3: 
nuclear@3: 
nuclear@3: // *** Thread-Safe RefCountImpl
nuclear@3: 
nuclear@3: void    RefCountImpl::AddRef()
nuclear@3: {
nuclear@3:     AtomicOps<int>::ExchangeAdd_NoSync(&RefCount, 1);
nuclear@3: }
nuclear@3: void    RefCountImpl::Release()
nuclear@3: {
nuclear@3:     if ((AtomicOps<int>::ExchangeAdd_NoSync(&RefCount, -1) - 1) == 0)
nuclear@3:         delete this;
nuclear@3: }
nuclear@3: 
nuclear@3: // *** Thread-Safe RefCountVImpl w/virtual AddRef/Release
nuclear@3: 
nuclear@3: void    RefCountVImpl::AddRef()
nuclear@3: {
nuclear@3:     AtomicOps<int>::ExchangeAdd_NoSync(&RefCount, 1);
nuclear@3: }
nuclear@3: void    RefCountVImpl::Release()
nuclear@3: {
nuclear@3:     if ((AtomicOps<int>::ExchangeAdd_NoSync(&RefCount, -1) - 1) == 0)
nuclear@3:         delete this;
nuclear@3: }
nuclear@3: 
nuclear@3: // *** NON-Thread-Safe RefCountImpl
nuclear@3: 
nuclear@3: void    RefCountNTSImpl::Release() const
nuclear@3: {
nuclear@3:     RefCount--;
nuclear@3:     if (RefCount == 0)
nuclear@3:         delete this;
nuclear@3: }
nuclear@3: 
nuclear@3: 
nuclear@3: } // OVR